ATcT [1 , 2 ] enthalpies of formation based on version 1.176 of the Thermochemical Network [3 ] 3 ] was generated by additional expansion of version 1.172 to include species related to Criegee intermediates that are involved in several ongoing studies[4 ].
Species Name acts as a link to the page
itemizing the most important contributors to the provenance of its ATcT enthalpy of formation, other highly correlated chemical species, and high-leverage reactions in the Thermochemical Network.
Reaction Search
The stoichiometry represents fractions as decimals,
Species Name Preferred Formula Image Δf H°(0 K)
Δf H°(298.15 K) Uncertainty Units Relative ATcT ID
Dihydrogen H2 (g) 0 0 exact 2.01588 ± 1333-74-0*0 Helium He (g) 0 0 exact 4.0026020 ± 7440-59-7*0 Carbon C (graphite) 0 0 exact 12.01070 ± 7440-44-0*500 Dinitrogen N2 (g) 0 0 exact 28.01348 ± 7727-37-9*0 Dioxygen O2 (g) 0 0 exact 31.99880 ± 7782-44-7*0 Difluorine F2 (g) 0 0 exact 37.9968064 ± 7782-41-4*0 Neon Ne (g) 0 0 exact 20.17970 ± 7440-01-9*0 Silicon Si (cr,l) 0 0 exact 28.08550 ± 7440-21-3*500 Sulfur S (cr,l) 0 0 exact 32.0660 ± 7704-34-9*500 Dichlorine Cl2 (g) 0 0 exact 70.9054 ± 7782-50-5*0 Argon Ar (g) 0 0 exact 39.94800 ± 7440-37-1*0 Dibromine Br2 (cr,l) 0 0 exact 159.8080 ± 7726-95-6*500 Krypton Kr (g) 0 0 exact 83.8000 ± 7439-90-9*0 Diiodine I2 (cr,l) 0 0 exact 253.808940 ± 7553-56-2*500 Xenon Xe (g) 0 0 exact 131.2900 ± 7440-63-3*0 Platinum Pt (cr,l) 0 0 exact 195.0780 ± 7440-06-4*500 Radon Rn (g) 0 0 exact 222.0000 ± 10043-92-2*0 Deuterium molecule D2 (g) 0 0 exact 4.02820355600 ± 7782-39-0*0 Hydrogen atom H (g) 216.034 217.998 ± 0.000 kJ/mol 1.007940 ± 12385-13-6*0 Carbon C (g) 711.381 716.866 ± 0.039 kJ/mol 12.01070 ± 7440-44-0*0 Oxygen atom O (g) 246.844 249.229 ± 0.0021 kJ/mol 15.99940 ± 17778-80-2*0 Methane CH4 (g) -66.547 -74.516 ± 0.043 kJ/mol 16.04246 ± 74-82-8*0 Water H2O (cr,l) -286.276 -285.804 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*500 Nitrogen atom N (g) 470.583 472.445 ± 0.022 kJ/mol 14.006740 ± 17778-88-0*0 Carbon dioxide CO2 (g) -393.111 -393.478 ± 0.015 kJ/mol 44.00950 ± 124-38-9*0 Hydron H+ (g) 1528.084 1530.047 ± 0.000 kJ/mol 1.007391 ± 12408-02-5*0 Water H2O (g) -238.907 -241.810 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*0 Ethane CH3CH3 (g) -68.40 -84.03 ± 0.12 kJ/mol 30.0690 ± 74-84-0*0 Chlorine atom Cl (g) 119.621 121.302 ± 0.0011 kJ/mol 35.45270 ± 22537-15-1*0 Fluorine atom F (g) 77.254 79.360 ± 0.017 kJ/mol 18.99840320 ± 14762-94-8*0 Ethylene CH2CH2 (g) 60.89 52.38 ± 0.11 kJ/mol 28.0532 ± 74-85-1*0 Propane CH3CH2CH3 (g) -82.73 -105.01 ± 0.15 kJ/mol 44.0956 ± 74-98-6*0 Methyl CH3 (g) 149.876 146.476 ± 0.049 kJ/mol 15.03452 ± 2229-07-4*0 Methanol CH3OH (g) -189.91 -200.80 ± 0.14 kJ/mol 32.04186 ± 67-56-1*0 Ammonia NH3 (g) -38.564 -45.556 ± 0.029 kJ/mol 17.03056 ± 7664-41-7*0 Bromine atom Br (g) 117.925 111.863 ± 0.055 kJ/mol 79.90400 ± 10097-32-2*0 Hydroxyl OH (g) 37.274 37.514 ± 0.022 kJ/mol 17.00734 ± 3352-57-6*0 Formaldehyde CH2O (g) -105.382 -109.223 ± 0.094 kJ/mol 30.02598 ± 50-00-0*0 Acetylene HCCH (g) 228.86 228.30 ± 0.12 kJ/mol 26.0373 ± 74-86-2*0 Ethanol CH3CH2OH (g) -217.20 -234.92 ± 0.20 kJ/mol 46.0684 ± 64-17-5*0 Carbon monoxide CO (g) -113.794 -110.514 ± 0.026 kJ/mol 28.01010 ± 630-08-0*0 Hydrogen chloride HCl (g) -91.988 -92.172 ± 0.0062 kJ/mol 36.46064 ± 7647-01-0*0 Benzene C6H6 (g) 100.68 83.17 ± 0.21 kJ/mol 78.1118 ± 71-43-2*0 Propene CH3CHCH2 (g) 34.89 20.06 ± 0.18 kJ/mol 42.0797 ± 115-07-1*0 Hydrogen fluoride HF (g) -272.679 -272.726 ± 0.018 kJ/mol 20.006343 ± 7664-39-3*0 Ethyl CH3CH2 (g) 131.50 120.75 ± 0.20 kJ/mol 29.0611 ± 2025-56-1*0 Hydrogen cyanide HCN (g) 129.677 129.292 ± 0.087 kJ/mol 27.02538 ± 74-90-8*0 Iodine I (g) 107.157 106.757 ± 0.0021 kJ/mol 126.904470 ± 14362-44-8*0 Hydrogen bromide HBr (g) -27.52 -35.36 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*0 Nitric oxide NO (g) 90.627 91.131 ± 0.064 kJ/mol 30.00614 ± 10102-43-9*0 Acetaldehyde CH3CHO (g) -154.88 -165.41 ± 0.22 kJ/mol 44.0526 ± 75-07-0*0 Propyne CH3CCH (g) 192.70 185.55 ± 0.20 kJ/mol 40.0639 ± 74-99-7*0 Chloromethane CH3Cl (g) -74.67 -82.60 ± 0.17 kJ/mol 50.4872 ± 74-87-3*0 Silicon Si (g) 450.34 454.68 ± 0.56 kJ/mol 28.08550 ± 7440-21-3*0 Dioxidanyl HOO (g) 15.06 12.16 ± 0.14 kJ/mol 33.00674 ± 3170-83-0*0 Acetone CH3C(O)CH3 (g) -199.94 -216.88 ± 0.26 kJ/mol 58.0791 ± 67-64-1*0 Hydroxyde [OH]- (g) -139.068 -139.034 ± 0.022 kJ/mol 17.00789 ± 14280-30-9*0 Methylamine CH3NH2 (g) -6.45 -21.16 ± 0.22 kJ/mol 31.05714 ± 74-89-5*0 Allene CH2CCH2 (g) 197.47 190.01 ± 0.22 kJ/mol 40.0639 ± 463-49-0*0 Nitrogen dioxide ONO (g) 36.866 34.059 ± 0.064 kJ/mol 46.00554 ± 10102-44-0*0 Hydrogen iodide HI (g) 28.645 26.470 ± 0.036 kJ/mol 127.912410 ± 10034-85-2*0 Vinyl CH2CH (g) 301.24 297.21 ± 0.27 kJ/mol 27.0452 ± 2669-89-8*0 Hydrogen peroxide HOOH (g) -129.426 -135.412 ± 0.057 kJ/mol 34.01468 ± 7722-84-1*0 Methylene CH2 (g, triplet) 391.066 391.612 ± 0.093 kJ/mol 14.02658 ± 2465-56-7*1 Fluoromethane CH3F (g) -227.45 -235.48 ± 0.24 kJ/mol 34.03292 ± 593-53-3*0 n-Butane CH3CH2CH2CH3 (g) -98.25 -125.56 ± 0.18 kJ/mol 58.1222 ± 106-97-8*0 Toluene C6H5CH3 (g) 73.35 50.06 ± 0.31 kJ/mol 92.1384 ± 108-88-3*0 Silane SiH4 (g) 42.66 33.04 ± 0.63 kJ/mol 32.11726 ± 7803-62-5*0 Methylene CH2 (g, singlet) 428.73 429.14 ± 0.11 kJ/mol 14.02658 ± 2465-56-7*2 Ozone OOO (g) 144.407 141.744 ± 0.039 kJ/mol 47.99820 ± 10028-15-6*0 1,3-Butadiene CH2CHCHCH2 (g) 125.61 111.14 ± 0.29 kJ/mol 54.0904 ± 106-99-0*0 Fluoride F- (g) -250.911 -249.126 ± 0.017 kJ/mol 18.99895178 ± 16984-48-8*0 Ammonium hydroxide NH4OH (aq, 1000 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*839 Ketene CH2CO (g) -45.34 -48.40 ± 0.11 kJ/mol 42.0367 ± 463-51-4*0 Nitrilomethyl CN (g) 436.72 440.01 ± 0.14 kJ/mol 26.01744 ± 2074-87-5*0 Bromomethane CH3Br (g) -20.48 -35.88 ± 0.19 kJ/mol 94.9385 ± 74-83-9*0 Methoxy CH3O (g) 29.01 21.64 ± 0.26 kJ/mol 31.03392 ± 2143-68-2*0 Phenyl C6H5 (g) 352.61 339.25 ± 0.60 kJ/mol 77.1039 ± 2396-01-2*0 Hydrogen chloride HCl (aq, 100 H2O) -165.756 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*828 Acetonitrile CH3CN (g) 81.14 74.08 ± 0.23 kJ/mol 41.0520 ± 75-05-8*0 Hydroxymethyl CH2OH (g) -10.08 -16.38 ± 0.28 kJ/mol 31.03392 ± 2597-43-5*0 Sulfur dioxide OSO (g) -294.20 -296.74 ± 0.13 kJ/mol 64.0648 ± 7446-09-5*0 Hydrogen iodide HI (aq, 5000 H2O) -56.641 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*844 Formic acid HC(O)OH (g, syn) -371.03 -378.35 ± 0.21 kJ/mol 46.0254 ± 64-18-6*1 Hydrogen fluoride HF (l) -303.201 ± 0.099 kJ/mol 20.006343 ± 7664-39-3*590 Methoxide [CH3O]- (g) -122.37 -130.10 ± 0.26 kJ/mol 31.03447 ± 3315-60-4*0 Propargyl CH2CCH (g) 354.08 351.49 ± 0.31 kJ/mol 39.0559 ± 2932-78-7*0 iso-Butane CH(CH3)3 (g) -105.89 -134.49 ± 0.27 kJ/mol 58.1222 ± 75-28-5*0 Acetic acid CH3C(O)OH (aq, 100 H2O) -484.66 ± 0.33 kJ/mol 60.0520 ± 64-19-7*828 Hypochlorous acid HOCl (g) -73.844 -76.784 ± 0.023 kJ/mol 52.46004 ± 7790-92-3*0 Hydrogen bromide HBr (aq, 3000 H2O) -120.26 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*842 Formic acid HC(O)OH (aq, 100 H2O) -425.30 ± 0.60 kJ/mol 46.0254 ± 64-18-6*828 Acetic acid CH3C(O)OH (g, syn) -418.50 -432.67 ± 0.35 kJ/mol 60.0520 ± 64-19-7*1 Amidogen NH2 (g) 188.92 186.03 ± 0.11 kJ/mol 16.02262 ± 13770-40-6*0 Tetrafluoromethane CF4 (g) -927.65 -933.62 ± 0.23 kJ/mol 88.00431 ± 75-73-0*0 Formyl HCO (g) 41.388 41.762 ± 0.094 kJ/mol 29.01804 ± 2597-44-6*0 n-Propyl CH3CH2CH2 (g) 118.44 101.04 ± 0.39 kJ/mol 43.0877 ± 2143-61-5*0 Cyclopropane CH2(CH2CH2) (g) 71.05 53.92 ± 0.32 kJ/mol 42.0797 ± 75-19-4*0 Cyclopentadiene CH2(CHCHCHCH) (g) 151.87 134.75 ± 0.49 kJ/mol 66.1011 ± 542-92-7*0 Formamide CH(O)NH2 (g) -178.63 -188.99 ± 0.34 kJ/mol 45.04066 ± 75-12-7*0 Dibromine Br2 (g) 45.70 30.90 ± 0.11 kJ/mol 159.8080 ± 7726-95-6*0 Diiodine I2 (g) 65.497 62.417 ± 0.0041 kJ/mol 253.808940 ± 7553-56-2*0 iso-Propyl CH3CHCH3 (g) 105.66 88.78 ± 0.38 kJ/mol 43.0877 ± 2025-55-0*0 Ethenol CH2CHOH (g, syn) -113.28 -124.41 ± 0.37 kJ/mol 44.0526 ± 557-75-5*1 Ethynyl CCH (g) 563.73 567.85 ± 0.15 kJ/mol 25.0293 ± 2122-48-7*0 Allyl CH2CHCH2 (g) 179.90 168.18 ± 0.33 kJ/mol 41.0718 ± 1981-80-2*0 Acetyl CH3CO (g) -3.61 -10.18 ± 0.29 kJ/mol 43.0446 ± 3170-69-2*0 Chloroethane CH3CH2Cl (g) -96.96 -111.55 ± 0.25 kJ/mol 64.5138 ± 75-00-3*0 Chloride Cl- (g) -228.953 -227.346 ± 0.0021 kJ/mol 35.45325 ± 16887-00-6*0 Methoxymethane CH3OCH3 (g) -166.39 -183.90 ± 0.35 kJ/mol 46.0684 ± 115-10-6*0 Ethylium [CH3CH2]+ (g) 915.16 903.09 ± 0.29 kJ/mol 29.0606 ± 14936-94-8*0 Methanimine CH2NH (g) 96.38 88.47 ± 0.34 kJ/mol 29.04126 ± 2053-29-4*0 Ethylamine CH3CH2NH2 (g) -28.05 -49.83 ± 0.45 kJ/mol 45.0837 ± 75-04-7*0 Fluoroform CHF3 (g) -689.30 -696.25 ± 0.40 kJ/mol 70.01385 ± 75-46-7*0 Oxomethylium [HCO]+ (g) 827.763 827.179 ± 0.095 kJ/mol 29.01749 ± 17030-74-9*0 Dioxymethyl CH2OO (g) 111.73 104.73 ± 0.53 kJ/mol 46.0254 ± 56077-92-0*0 Trifluoromethyl CF3 (g) -465.15 -467.95 ± 0.42 kJ/mol 69.00591 ± 2264-21-3*0 Methylidyne CH (g) 592.967 596.301 ± 0.081 kJ/mol 13.01864 ± 3315-37-5*0 Methyl hydroperoxide CH3OOH (g) -114.82 -127.64 ± 0.42 kJ/mol 48.0413 ± 3031-73-0*0 Phenol C6H5OH (g) -74.35 -92.94 ± 0.62 kJ/mol 94.1112 ± 108-95-2*0 Tetrachloromethane CCl4 (g) -89.30 -91.47 ± 0.41 kJ/mol 153.8215 ± 56-23-5*0 Benzaldehyde C6H5C(O)H (g) -19.18 -36.97 ± 0.68 kJ/mol 106.1219 ± 100-52-7*0 Bromide Br- (g) -206.612 -212.674 ± 0.055 kJ/mol 79.90455 ± 24959-67-9*0 Oxonium [H3O]+ (g) 605.89 599.14 ± 0.17 kJ/mol 19.02267 ± 13968-08-6*0 Hypobromous acid HOBr (g) -51.27 -61.75 ± 0.48 kJ/mol 96.9113 ± 13517-11-8*0 Methylperoxy CH3OO (g) 22.52 13.07 ± 0.34 kJ/mol 47.0333 ± 2143-58-0*0 Cyanoacetylene HCCCN (g) 372.22 373.96 ± 0.57 kJ/mol 51.0468 ± 1070-71-9*0 Chlorooxidanyl ClO (g) 101.124 101.716 ± 0.035 kJ/mol 51.45210 ± 14989-30-1*0 Iodide I- (g) -187.996 -188.396 ± 0.0021 kJ/mol 126.905019 ± 20461-54-5*0 Nitric acid HON(O)O (g) -124.46 -134.17 ± 0.17 kJ/mol 63.01288 ± 7697-37-2*0 Hydroxyformyl HOCO (g, trans) -181.15 -184.12 ± 0.40 kJ/mol 45.0174 ± 2564-86-5*1 Vinyl chloride CH2CHCl (g) 29.38 21.80 ± 0.27 kJ/mol 62.4979 ± 75-01-4*0 Imidogen NH (g) 358.75 358.79 ± 0.16 kJ/mol 15.014680 ± 13774-92-0*0 1-Hydroxyethyl CH3CHOH (g, gauche-anti) -42.73 -56.16 ± 0.46 kJ/mol 45.0605 ± 2348-46-1*1 Vinylacetylene CH2CHCCH (g) 296.44 289.68 ± 0.52 kJ/mol 52.0746 ± 689-97-4*0 Sulfur trioxide OS(O)O (g) -389.75 -395.50 ± 0.24 kJ/mol 80.0642 ± 7446-11-9*0 Oxygen atom anion O- (g) 105.868 108.096 ± 0.0021 kJ/mol 15.99995 ± 14337-01-0*0 Oxirane O(CH2CH2) (g) -39.73 -52.29 ± 0.33 kJ/mol 44.0526 ± 75-21-8*0 Ethoxide [CH3CH2O]- (g) -163.78 -178.72 ± 0.44 kJ/mol 45.0610 ± 16331-64-9*0 Iodomethane CH3I (g) 24.47 14.94 ± 0.17 kJ/mol 141.93899 ± 74-88-4*0 1,3-Butadiyne HCCCCH (g) 458.35 460.08 ± 0.48 kJ/mol 50.0587 ± 460-12-8*0 Isocyanic acid HNCO (g) -115.94 -118.93 ± 0.28 kJ/mol 43.02478 ± 75-13-8*0 Cyanamide NH2CN (g) 141.60 135.58 ± 0.78 kJ/mol 42.04006 ± 420-04-2*0 Difluorophosgene CF2O (g) -603.35 -606.45 ± 0.40 kJ/mol 66.00691 ± 353-50-4*0 Methylium [CH3]+ (g) 1099.349 1095.405 ± 0.045 kJ/mol 15.03397 ± 14531-53-4*0 Hypofluorous acid HOF (g) -84.38 -87.28 ± 0.19 kJ/mol 36.00574 ± 14034-79-8*0 Nitric acid HON(O)O (aq, 1000 H2O) -206.23 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*839 Isobutene CH2C(CH3)2 (g) 4.29 -16.77 ± 0.32 kJ/mol 56.1063 ± 115-11-7*0 2-Hydroxyethyl CH2CH2OH (g, gauche-syn) -12.90 -26.17 ± 0.48 kJ/mol 45.0605 ± 4422-54-2*1 N-Methylenemethanamine CH3NCH2 (g) 94.59 79.68 ± 0.67 kJ/mol 43.0678 ± 1761-67-7*0 Dichloromethane CH2Cl2 (g) -86.86 -93.72 ± 0.33 kJ/mol 84.9320 ± 75-09-2*0 Chlorobenzene C6H5Cl (g) 67.26 52.30 ± 0.61 kJ/mol 112.5566 ± 108-90-7*0 Sulfur S (g) 276.83 279.08 ± 0.14 kJ/mol 32.0660 ± 7704-34-9*0 Hydrogen chloride HCl (aq, 600 H2O) -166.450 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*834 Ethynide [CCH]- (g) 277.29 280.70 ± 0.18 kJ/mol 25.0299 ± 29075-95-4*0 Methylamidogen CH3NH (g) 187.98 177.33 ± 0.40 kJ/mol 30.04920 ± 15622-51-2*0 Isocyanomethane CH3NC (g) 183.80 177.25 ± 0.47 kJ/mol 41.0520 ± 593-75-9*0 1,2-Butadiene CH3CHCCH2 (g) 176.04 162.54 ± 0.42 kJ/mol 54.0904 ± 590-19-2*0 Benzyl C6H5CH2 (g) 230.13 211.32 ± 0.51 kJ/mol 91.1305 ± 2154-56-5*0 Cyclopentadienyl CH(CHCHCHCH) (g) 275.59 262.48 ± 0.80 kJ/mol 65.0932 ± 2143-53-5*0 Ethyl hydroperoxide CH3CH2OOH (g) -142.45 -160.88 ± 0.67 kJ/mol 62.0678 ± 3031-74-1*0 Dimethylamine (CH3)2NH (g) 4.63 -17.01 ± 0.47 kJ/mol 45.0837 ± 124-40-3*0 Trimethylsilane SiH(CH3)3 (g) -125.8 -151.9 ± 1.5 kJ/mol 74.1970 ± 993-07-7*0 Hydrogen sulfide H2S (g) -17.37 -20.29 ± 0.18 kJ/mol 34.0819 ± 7783-06-4*0 Hydride H- (g) 143.264 145.228 ± 0.000 kJ/mol 1.008489 ± 12184-88-2*0 Cyanogen chloride ClCN (g) 135.13 135.83 ± 0.43 kJ/mol 61.4701 ± 506-77-4*0 Trihydrogen cation [H3]+ (g) 1110.304 1106.696 ± 0.013 kJ/mol 3.02327 ± 28132-48-1*0 Phenide [C6H5]- (g) 244.25 230.83 ± 0.38 kJ/mol 77.1044 ± 30922-78-2*0 Cyclopropene CH2(CHCH) (g) 292.57 283.84 ± 0.41 kJ/mol 40.0639 ± 2781-85-3*0 Methyl formate HC(O)OCH3 (g, syn) -346.85 -359.90 ± 0.61 kJ/mol 60.0520 ± 107-31-3*1 Fluoromethylidyne CF (g) 243.16 246.76 ± 0.11 kJ/mol 31.00910 ± 3889-75-6*0 Acrolein CH2CHCHO (g, trans) -55.13 -65.53 ± 0.64 kJ/mol 56.0633 ± 107-02-8*1 Sulfuric acid OS(O)(OH)2 (aq, 100 H2O) -887.53 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*828 Tetrafluorosilane SiF4 (g) -1608.76 -1614.27 ± 0.52 kJ/mol 104.07911 ± 7783-61-1*0 Oxygen atom cation O+ (g) 1560.786 1562.643 ± 0.0021 kJ/mol 15.99885 ± 14581-93-2*0 Ammonium [NH4]+ (g) 643.03 631.71 ± 0.20 kJ/mol 18.03795 ± 14798-03-9*0 Nitrous acid HONO (g, trans) -72.986 -79.130 ± 0.078 kJ/mol 47.01348 ± 7782-77-6*1 Hydroxymethylium [CH2OH]+ (g) 717.79 709.85 ± 0.17 kJ/mol 31.03337 ± 18682-95-6*0 Cyanide [CN]- (g) 63.972 67.258 ± 0.091 kJ/mol 26.01799 ± 57-12-5*0 2-Butyne CH3CCCH3 (g) 159.56 146.59 ± 0.45 kJ/mol 54.0904 ± 503-17-3*0 Propynylidene HCCCH (g, triplet) 543.70 546.70 ± 0.58 kJ/mol 38.0480 ± 67152-18-5*1 Difluoromethane CH2F2 (g) -443.33 -450.94 ± 0.35 kJ/mol 52.02339 ± 75-10-5*0 Vinyl bromide CH2CHBr (g) 88.86 74.05 ± 0.54 kJ/mol 106.9492 ± 593-60-2*0 Silyl SiH3 (g) 204.71 199.23 ± 0.80 kJ/mol 31.10932 ± 13765-44-1*0 Sulfurous acid S(O)(OH)2 (aq, 2500 H2O) -617.30 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*898 Oxygen difluoride FOF (g) 26.80 24.55 ± 0.22 kJ/mol 53.99621 ± 7783-41-7*0 Hypochlorite [ClO]- (g) -118.60 -118.33 ± 0.13 kJ/mol 51.45265 ± 14380-61-1*0 Hypoiodous acid HOI (g) -53.6 -58.3 ± 2.8 kJ/mol 143.91181 ± 14332-21-9*0 Nitrosyl hydride HNO (g) 109.94 106.97 ± 0.11 kJ/mol 31.01408 ± 14332-28-6*0 Butatriene CH2CCCH2 (g) 328.40 322.14 ± 0.53 kJ/mol 52.0746 ± 2873-50-9*0 Ethoxy CH3CH2O (g, X 2A") 1.35 -12.56 ± 0.42 kJ/mol 45.0605 ± 2154-50-9*51 Ethylperoxy CH3CH2OO (g, gauche) -6.13 -22.16 ± 0.62 kJ/mol 61.0599 ± 3170-61-4*3 Acetone enol CH3C(OH)CH2 (g, syn) -151.27 -168.55 ± 0.68 kJ/mol 58.0791 ± 29456-04-0*1 Phosgene CCl2O (g) -217.49 -219.18 ± 0.24 kJ/mol 98.9155 ± 75-44-5*0 1-Hydroxy-2-propanone CH3C(O)CH2OH (g, syn-syn) -354.43 -373.82 ± 0.84 kJ/mol 74.0785 ± 116-09-6*11 Cyanoamidogen HNCN (g, doublet) 322.70 320.21 ± 0.63 kJ/mol 41.03212 ± 12347-01-2*1 Chloroform CHCl3 (g) -94.54 -99.44 ± 0.39 kJ/mol 119.3767 ± 67-66-3*0 Tetrafluoroethylene CF2CF2 (g) -670.68 -674.08 ± 0.47 kJ/mol 100.0150 ± 116-14-3*0 Benzoyl C6H5CO (g) 138.83 125.30 ± 0.98 kJ/mol 105.1140 ± 2652-65-5*0 Acrylonitrile CH2CHCN (g, singlet) 194.00 187.23 ± 0.60 kJ/mol 53.0627 ± 107-13-1*1 Silanol SiH3OH (g) -271.0 -282.7 ± 1.2 kJ/mol 48.11666 ± 14475-38-8*0 Naphthalene C6H4(C4H4) (g) 171.16 147.69 ± 0.55 kJ/mol 128.1705 ± 91-20-3*0 1,2-Propadiene-1,3-diylidene CCC (g) 814.37 823.33 ± 0.49 kJ/mol 36.0321 ± 12075-35-3*0 Methylidyne CH (g, quartet) 664.70 668.03 ± 0.52 kJ/mol 13.01864 ± 3315-37-5*2 Vinyl anion [CH2CH]- (g) 236.98 232.56 ± 0.68 kJ/mol 27.0458 ± 25012-81-1*0 Cyanogen bromide BrCN (g) 186.8 180.2 ± 1.4 kJ/mol 105.9214 ± 506-68-3*0 n-Butyl CH3CH2CH2CH2 (g) 103.08 80.57 ± 0.60 kJ/mol 57.1143 ± 2492-36-6*0 neo-Pentane C(CH3)4 (g) -134.27 -167.15 ± 0.38 kJ/mol 72.1488 ± 463-82-1*0 trans-2-Butene CH3CHCHCH3 (g, trans) 9.66 -10.90 ± 0.28 kJ/mol 56.1063 ± 624-64-6*0 1-Butene CH2CHCH2CH3 (g) 21.22 0.26 ± 0.33 kJ/mol 56.1063 ± 106-98-9*0 n-Hexane CH3CH2CH2CH2CH2CH3 (g) -129.92 -166.79 ± 0.32 kJ/mol 86.1754 ± 110-54-3*0 Formate [HC(O)O]- (g) -463.10 -466.75 ± 0.55 kJ/mol 45.0180 ± 71-47-6*0 Propionaldehyde CH3CH2CHO (g) -171.11 -186.52 ± 0.20 kJ/mol 58.0791 ± 123-38-6*0 Methyl acetate CH3C(O)OCH3 (g, syn) -394.15 -413.02 ± 0.56 kJ/mol 74.0785 ± 79-20-9*1 Aziridine NH(CH2CH2) (g) 143.56 127.03 ± 0.85 kJ/mol 43.0678 ± 151-56-4*0 Tetrabromomethane CBr4 (g) 144.72 115.02 ± 0.74 kJ/mol 331.6267 ± 558-13-4*0 Ethyl bromide CH3CH2Br (g) -41.00 -62.94 ± 0.24 kJ/mol 108.9651 ± 74-96-4*0 Methyl nitrite CH3ONO (g, cis) -55.43 -67.21 ± 0.43 kJ/mol 61.0401 ± 624-91-9*2 Propadienone CH2CCO (g) 132.21 130.57 ± 0.61 kJ/mol 54.0474 ± 61244-93-7*0 Chlorine fluoride ClF (g) -55.622 -55.717 ± 0.030 kJ/mol 54.45110 ± 7790-89-8*0 Diazynium [NNH]+ (g) 1042.57 1038.96 ± 0.67 kJ/mol 29.02087 ± 12357-66-3*0 Nitrite [ONO]- (g) -182.63 -185.43 ± 0.46 kJ/mol 46.00609 ± 14797-65-0*0 Hydroxylamine NH2OH (g, trans) -33.06 -43.44 ± 0.42 kJ/mol 33.02996 ± 7803-49-8*1 Aminomethyl CH2NH2 (g) 159.42 149.57 ± 0.35 kJ/mol 30.04920 ± 10507-29-6*0 cis-2-Butene CH3CHCHCH3 (g, cis) 14.41 -6.86 ± 0.38 kJ/mol 56.1063 ± 590-18-1*0 1-Butyne CH3CH2CCH (g) 180.40 166.82 ± 0.56 kJ/mol 54.0904 ± 107-00-6*0 Methanetetraylbisamidogen NCN (g) 451.36 451.77 ± 0.40 kJ/mol 40.02418 ± 2669-76-3*0 Vinyl fluoride CH2CHF (g) -134.52 -142.33 ± 0.45 kJ/mol 46.0436 ± 75-02-5*0 Phenylium [C6H5]+ (g) 1149.28 1136.50 ± 0.85 kJ/mol 77.1034 ± 17333-73-2*0 Indene C6H4(CHCHCH2) (g) 183.77 159.88 ± 0.72 kJ/mol 116.1598 ± 95-13-6*0 Fluorobenzene C6H5F (g) -96.05 -111.73 ± 0.39 kJ/mol 96.1023 ± 462-06-6*0 Nitromethane CH3N(O)O (g) -60.75 -74.65 ± 0.42 kJ/mol 61.0401 ± 75-52-5*0 Fluorooxidanyl FO (g) 110.28 110.90 ± 0.14 kJ/mol 34.99780 ± 12061-70-0*0 Nitrous oxide NNO (g) 86.017 82.588 ± 0.096 kJ/mol 44.01288 ± 10024-97-2*0 Azanide [NH2]- (g) 114.65 111.77 ± 0.29 kJ/mol 16.02317 ± 17655-31-1*0 Methanium [CH5]+ (g) 921.99 911.75 ± 0.44 kJ/mol 17.04985 ± 15135-49-6*0 Peroxynitrous acid HOONO (g, cis, cis) -5.74 -14.18 ± 0.35 kJ/mol 63.01288 ± 14691-52-2*3 Ethylidene CH3CH (g, triplet) 361.29 354.28 ± 0.48 kJ/mol 28.0532 ± 4218-50-2*1 Ethylidene CH3CH (g, singlet) 373.63 366.41 ± 0.56 kJ/mol 28.0532 ± 4218-50-2*2 Cyanomethyl CH2CN (g) 262.83 259.95 ± 0.53 kJ/mol 40.0440 ± 2932-82-3*0 Cyanic fluoride FCN (g) 8.48 8.81 ± 0.74 kJ/mol 45.01584 ± 1495-50-7*0 Propadienylidene CH2CC (g) 554.44 555.58 ± 0.39 kJ/mol 38.0480 ± 60731-10-4*0 t-Butyl (CH3)3C (g) 75.34 50.04 ± 0.68 kJ/mol 57.1143 ± 1605-73-8*0 n-Pentane CH3CH2CH2CH2CH3 (g) -114.19 -146.06 ± 0.29 kJ/mol 72.1488 ± 109-66-0*0 Methanediol CH2(OH)2 (g, C2 gauche) -378.48 -392.42 ± 0.62 kJ/mol 48.0413 ± 463-57-0*1 Formic acid HC(O)OH (g, anti) -354.70 -361.80 ± 0.37 kJ/mol 46.0254 ± 64-18-6*2 Cyanooxidanyl NCO (g) 126.96 127.43 ± 0.33 kJ/mol 42.01684 ± 22400-26-6*0 Ethenamine CH2CHNH2 (g) 69.38 54.82 ± 0.66 kJ/mol 43.0678 ± 593-67-9*0 Fluoroethane CH3CH2F (g) -257.25 -272.12 ± 0.35 kJ/mol 48.0595 ± 353-36-6*0 Chlorotrifluoromethane CF3Cl (g) -704.27 -709.38 ± 0.56 kJ/mol 104.4586 ± 75-72-9*0 Pyridine N(CHCHCHCHCH) (g) 157.32 140.52 ± 0.40 kJ/mol 79.0999 ± 110-86-1*0 Carbamoyl NH2CO (g) -7.74 -14.14 ± 0.72 kJ/mol 44.03272 ± 2858-51-7*0 Acrylonitrile CH2CHCN (g) 194.00 187.23 ± 0.60 kJ/mol 53.0627 ± 107-13-1*0 1,2,3-Butatrien-1-yl CH2CCCH (g) 497.52 497.54 ± 0.66 kJ/mol 51.0666 ± 22112-56-7*0 Disilane SiH3SiH3 (g) 92.0 75.9 ± 1.3 kJ/mol 62.21864 ± 1590-87-0*0 2,4-Hexadiyne CH3CCCCCH3 (g) 380.33 370.31 ± 0.82 kJ/mol 78.1118 ± 2809-69-0*0 Bromooxidanyl BrO (g) 131.22 123.68 ± 0.28 kJ/mol 95.9034 ± 15656-19-6*0 Aminooxy NH2O (g) 70.65 64.04 ± 0.62 kJ/mol 32.02202 ± 13408-29-2*0 Hydroxyamidogen HNOH (g, trans) 101.27 94.43 ± 0.83 kJ/mol 32.02202 ± 13940-32-4*1 Dioxygen cation [O2]+ (g) 1164.585 1165.221 ± 0.0092 kJ/mol 31.99825 ± 12185-07-8*0 Ethynylene C2 (g) 819.961 828.427 ± 0.082 kJ/mol 24.0214 ± 12070-15-4*0 Ethanide [CH3CH2]- (g) 155.42 144.34 ± 0.87 kJ/mol 29.0616 ± 25013-41-6*0 Vinylium [CH2CH]+ (g) 1119.22 1115.77 ± 0.53 kJ/mol 27.0447 ± 14604-48-9*0 Vinylidene CCH2 (g) 411.21 412.12 ± 0.30 kJ/mol 26.0373 ± 2143-69-3*0 Hydroxymethylene HCOH (g, trans) 112.70 108.93 ± 0.27 kJ/mol 30.02598 ± 19710-56-6*1 Carbonic acid C(O)(OH)2 (g, cis-cis) -602.29 -612.46 ± 0.55 kJ/mol 62.0248 ± 463-79-6*1 Peroxyformic acid HC(O)OOH (g, cis) -279.23 -288.58 ± 0.63 kJ/mol 62.0248 ± 107-32-4*1 1,2-Propadienyl anion [CH2CCH]- (g) 266.07 263.01 ± 0.63 kJ/mol 39.0565 ± 64066-06-4*0 1-Propanol CH3CH2CH2OH (g) -231.15 -254.99 ± 0.20 kJ/mol 60.0950 ± 71-23-8*0 Cyclopentane CH2(CH2CH2CH2CH2) (g) -43.39 -75.96 ± 0.38 kJ/mol 70.1329 ± 287-92-3*0 Vinoxy CH2CHO (g) 23.01 16.21 ± 0.56 kJ/mol 43.0446 ± 6912-06-7*0 Phenolate [C6H5O]- (g) -145.95 -161.42 ± 0.81 kJ/mol 93.1038 ± 3229-70-7*0 (1E)-Ethanimine CH3CHNH (g, trans) 55.79 39.58 ± 0.72 kJ/mol 43.0678 ± 56003-81-7*0 Diazomethyl HCNN (g, doublet) 467.84 465.28 ± 0.68 kJ/mol 41.03212 ± 20813-32-5*1 Bromotrifluoromethane CF3Br (g) -638.64 -650.76 ± 0.39 kJ/mol 148.9099 ± 75-63-8*0 Bromoform CHBr3 (g) 80.92 54.77 ± 0.71 kJ/mol 252.7306 ± 75-25-2*0 Tetrahedrane CH(CH(CHCH)) (g) 547.69 539.28 ± 0.91 kJ/mol 52.0746 ± 157-39-1*0 Silylene SiH2 (g, singlet) 271.60 269.94 ± 0.81 kJ/mol 30.10138 ± 13825-90-6*2 Water H2O (l) -285.804 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*590 Trioxidane HOOOH (g, trans) -81.76 -90.60 ± 0.40 kJ/mol 50.01408 ± 14699-99-1*1 Chlorine dioxide OClO (g) 101.42 98.95 ± 0.29 kJ/mol 67.4515 ± 10049-04-4*0 Hypobromite [BrO]- (g) -95.99 -103.47 ± 0.53 kJ/mol 95.9039 ± 14380-62-2*0 Nitrogen trifluoride NF3 (g) -125.85 -131.56 ± 0.55 kJ/mol 71.001950 ± 7783-54-2*0 (E)-Diazene HNNH (g, trans) 207.17 200.03 ± 0.40 kJ/mol 30.02936 ± 15626-43-4*0 (E)-Iminomethyl HCNH (g, trans) 275.79 272.18 ± 0.56 kJ/mol 28.03332 ± 54980-10-8*0 Cyanogen NCCN (g) 308.17 310.12 ± 0.41 kJ/mol 52.0349 ± 460-19-5*0 Peroxyformyl HC(O)OO (g, syn) -100.42 -105.73 ± 0.67 kJ/mol 61.0168 ± 56240-83-6*1 1-Methylethenyl CH3CCH2 (g) 263.03 252.63 ± 0.61 kJ/mol 41.0718 ± 15552-77-9*0 Cyclopentene CH2(CH2CHCHCH2) (g) 59.92 35.65 ± 0.43 kJ/mol 68.1170 ± 142-29-0*0 Trimethylamine (CH3)3N (g) 2.64 -26.21 ± 0.79 kJ/mol 59.1103 ± 75-50-3*0 Diazomethane CH2NN (g) 273.61 267.34 ± 0.86 kJ/mol 42.04006 ± 334-88-3*0 Dichloromethylene CCl2 (g, singlet) 229.87 231.05 ± 0.64 kJ/mol 82.9161 ± 1605-72-7*2 Trifluoromethylium [CF3]+ (g) 409.80 406.59 ± 0.40 kJ/mol 69.00536 ± 18851-76-8*0 Acetonyl CH3C(O)CH2 (g) -18.44 -32.04 ± 0.64 kJ/mol 57.0712 ± 3122-07-4*0 Ethyl nitrite CH3CH2ONO (g, trans-cis) -81.16 -99.90 ± 0.87 kJ/mol 75.0666 ± 109-95-5*1 Methylketene CH3CHCO (g) -54.12 -63.59 ± 0.63 kJ/mol 56.0633 ± 6004-44-0*0 Disilene SiH2SiH2 (g, singlet) 288.8 280.2 ± 1.7 kJ/mol 60.20276 ± 15435-77-5*2 1,3-Pentadiyne HCCCCCH3 (g) 418.16 413.94 ± 0.65 kJ/mol 64.0853 ± 4911-55-1*0 Disulfur S2 (g) 127.37 127.68 ± 0.27 kJ/mol 64.1320 ± 23550-45-0*0 Sulfuric acid OS(O)(OH)2 (cr,l) -811.89 -813.88 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*500 Dimethyl sulfide CH3SCH3 (g) -20.24 -36.75 ± 0.35 kJ/mol 62.1350 ± 75-18-3*0 Azido radical NNN (g) 452.38 449.79 ± 0.59 kJ/mol 42.02022 ± 12596-60-0*0 Nitrosyl ion [NO]+ (g) 984.494 984.489 ± 0.064 kJ/mol 30.00559 ± 14452-93-8*0 Ozonide [OOO]- (g) -58.47 -60.83 ± 0.21 kJ/mol 47.99875 ± 12596-80-4*0 Hydroxyoxomethylium [HOCO]+ (g) 600.69 597.60 ± 0.43 kJ/mol 45.0169 ± 638-71-1*0 Hydrazoic acid HNNN (g) 297.99 291.69 ± 0.48 kJ/mol 43.02816 ± 7782-79-8*0 Methylidyne CH (g, doublet) 592.967 596.301 ± 0.081 kJ/mol 13.01864 ± 3315-37-5*1 Acetylium [CH3CO]+ (g) 666.68 659.39 ± 0.42 kJ/mol 43.0441 ± 15762-07-9*0 Aminomethylium [CH2NH2]+ (g) 763.61 751.64 ± 0.53 kJ/mol 30.04865 ± 488821-23-4*0 Hydrogen isocyanide HNC (g) 192.06 192.44 ± 0.32 kJ/mol 27.02538 ± 6914-07-4*0 Chloroacetylene HCCCl (g) 229.32 230.18 ± 0.45 kJ/mol 60.4820 ± 593-63-5*0 Fluoroacetylene HCCF (g) 104.96 105.68 ± 0.39 kJ/mol 44.0277 ± 2713-09-9*0 iso-Propylium [CH3CHCH3]+ (g) 822.97 805.89 ± 0.23 kJ/mol 43.0871 ± 19252-53-0*0 1-Propenyl CH3CHCH (g, cis) 278.19 267.34 ± 0.63 kJ/mol 41.0718 ± 6067-68-1*2 Hydroxyde [OH]- (aq) -229.761 ± 0.023 kJ/mol 17.00789 ± 14280-30-9*800 1-Hydroxyethylium [CH3CHOH]+ (g, anti) 608.87 594.44 ± 0.38 kJ/mol 45.0600 ± 18682-96-7*1 Difluorodioxidane FOOF (g) 35.37 31.64 ± 0.40 kJ/mol 69.99561 ± 7783-44-0*0 Ketenyl HCCO (g) 177.10 178.19 ± 0.54 kJ/mol 41.0287 ± 51095-15-9*0 Hydroxymethoxy CH2(OH)O (g, gauche) -159.58 -169.54 ± 0.84 kJ/mol 47.0333 ± 72144-78-6*3 Formic acid HC(O)OH (g) -371.03 -378.33 ± 0.21 kJ/mol 46.0254 ± 64-18-6*0 Dioxirane CH2(OO) (g) 9.33 1.66 ± 0.52 kJ/mol 46.0254 ± 157-26-6*0 1-Butanol CH3CH2CH2CH2OH (g) -244.51 -274.76 ± 0.24 kJ/mol 74.1216 ± 71-36-3*0 Acetic acid CH3C(O)OH (g, anti) -397.70 -412.11 ± 0.51 kJ/mol 60.0520 ± 64-19-7*2 Glycolaldehyde HC(O)CH2OH (g, syn-syn) -304.31 -317.58 ± 0.89 kJ/mol 60.0520 ± 141-46-8*11 Methyl formate HC(O)OCH3 (g, anti) -326.6 -339.1 ± 1.1 kJ/mol 60.0520 ± 107-31-3*2 Glyoxal OCHCHO (g, trans) -207.84 -213.48 ± 0.55 kJ/mol 58.0361 ± 107-22-2*1 (Methylamino)methyl CH3NHCH2 (g) 168.77 152.32 ± 0.71 kJ/mol 44.0758 ± 31277-24-4*0 Diazirinyl HC(NN) (g, 2A2) 491.06 487.67 ± 0.96 kJ/mol 41.03212 ± 69967-71-1*1 Diazirine CH2(NN) (g) 320.7 313.0 ± 1.1 kJ/mol 42.04006 ± 157-22-2*0 Trichloromethyl CCl3 (g) 73.76 73.29 ± 0.84 kJ/mol 118.3688 ± 3170-80-7*0 1,1-Dichloroethane CH3CHCl2 (g) -120.17 -132.95 ± 0.43 kJ/mol 98.9586 ± 75-34-3*0 Bromobenzene C6H5Br (g) 127.0 104.9 ± 1.3 kJ/mol 157.0079 ± 108-86-1*0 Phenylethene C6H5CHCH2 (g) 169.89 148.55 ± 0.51 kJ/mol 104.1491 ± 100-42-5*0 Phenylacetylene C6H5CCH (g) 332.78 317.62 ± 0.69 kJ/mol 102.1332 ± 536-74-3*0 Phenoxy C6H5O (g) 71.51 56.22 ± 0.81 kJ/mol 93.1033 ± 2122-46-5*0 Dioxidanide [HOO]- (g) -88.92 -91.58 ± 0.34 kJ/mol 33.00729 ± 14691-59-9*0 Acetophenone C6H5C(O)CH3 (g) -60.74 -83.92 ± 0.98 kJ/mol 120.1485 ± 98-86-2*0 Nitrosomethane CH3NO (g) 80.95 71.04 ± 0.91 kJ/mol 45.04066 ± 865-40-7*0 Isocyanoacetylene HCCNC (g) 484.77 486.99 ± 0.98 kJ/mol 51.0468 ± 66723-45-3*0 Cyclobutadiene CH(CHCHCH) (g) 436.54 428.08 ± 0.63 kJ/mol 52.0746 ± 1120-53-2*0 Fulvene CH2C(CHCHCHCH) (g) 232.1 216.0 ± 1.1 kJ/mol 78.1118 ± 497-20-1*0 Disilanyl SiH3SiH2 (g) 242.4 230.4 ± 1.5 kJ/mol 61.21070 ± 73151-72-1*0 Silanone SiH2O (g) -93.78 -99.12 ± 0.99 kJ/mol 46.10078 ± 22755-01-7*0 Silyloxy SiH3O (g) 8.5 0.6 ± 1.4 kJ/mol 47.10872 ± 81429-20-1*0 Sulfanyl SH (g) 142.81 143.26 ± 0.18 kJ/mol 33.0739 ± 13940-21-1*0 Methanethiol CH3SH (g) -10.39 -20.66 ± 0.46 kJ/mol 48.1085 ± 74-93-1*0 Chlorous acid HOClO (g) 25.76 20.71 ± 0.63 kJ/mol 68.4594 ± 13898-47-0*0 Iodooxidanyl IO (g) 127.05 125.12 ± 0.82 kJ/mol 142.90387 ± 14696-98-1*0 Iodotrifluoromethane CF3I (g) -583.20 -589.11 ± 0.45 kJ/mol 195.91038 ± 2314-97-8*0 Carbon monoxide cation [CO]+ (g) 1238.315 1241.595 ± 0.026 kJ/mol 28.00955 ± 12144-04-6*0 Hydrazine NH2NH2 (g) 111.75 97.60 ± 0.44 kJ/mol 32.04524 ± 302-01-2*0 Nitrate [ON(O)O]- (g) -299.73 -306.28 ± 0.22 kJ/mol 62.00549 ± 14797-55-8*0 Fluorodioxidanyl FOO (g) 26.87 25.16 ± 0.26 kJ/mol 50.99720 ± 15499-23-7*0 Methanide [CH3]- (g) 141.15 137.71 ± 0.24 kJ/mol 15.03507 ± 15194-58-8*0 Methyleneamidogen CH2N (g) 242.07 238.42 ± 0.55 kJ/mol 28.03332 ± 15845-29-1*0 Cyanogen iodide ICN (g) 222.5 222.0 ± 1.7 kJ/mol 152.92191 ± 506-78-5*0 Dioxygen anion [O2]- (g) -43.36 -42.72 ± 0.17 kJ/mol 31.99935 ± 11062-77-4*0 Formyl anion [HCO]- (g) 11.60 11.98 ± 0.44 kJ/mol 29.01859 ± 57340-31-5*0 n-Propylium [CH3CH2CH2]+ (g) 857.14 838.86 ± 0.76 kJ/mol 43.0871 ± 19252-52-9*0 Cyclopropyl CH(CH2CH2) (g) 303.89 291.26 ± 0.48 kJ/mol 41.0718 ± 2417-82-5*0 2-Propynylidyne CCCH (g) 718.75 723.10 ± 0.71 kJ/mol 37.0400 ± 53590-28-6*0 iso-Pentane CH3CH2CH(CH3)2 (g) -118.93 -152.98 ± 0.39 kJ/mol 72.1488 ± 78-78-4*0 1-Hydroxyethylidene CH3COH (g, anti singlet) 57.44 47.06 ± 0.77 kJ/mol 44.0526 ± 30967-49-8*21 Dicarbon monoxide CCO (g, triplet) 377.12 381.16 ± 0.83 kJ/mol 40.0208 ± 12071-23-7*1 2-Ethylidenedioxidan-2-ium-1-ide CH3CHOO (g, syn) 51.18 37.72 ± 0.83 kJ/mol 60.0520 ± 68941-70-8*2 Vinyl hydroperoxide CH2CHOOH (g, perp-syn) -25.09 -37.37 ± 0.96 kJ/mol 60.0520 ± 66998-78-5*1 Acetic acid CH3C(O)OH (g) -418.50 -432.67 ± 0.35 kJ/mol 60.0520 ± 64-19-7*0 Dimethylamidogen (CH3)2N (g) 175.04 157.70 ± 0.92 kJ/mol 44.0758 ± 15337-44-7*0 2-Iminoethyl CH2CHNH (g, anti) 219.35 207.99 ± 0.86 kJ/mol 42.0599 ± 73843-90-0*2 Isocyanoamidogen HNNC (g, doublet) 489.7 487.7 ± 1.2 kJ/mol 41.03212 ± 947408-73-3*1 Chloromethylene CHCl (g, singlet) 320.35 320.63 ± 0.89 kJ/mol 48.4713 ± 2108-20-5*2 Dibromomethane CH2Br2 (g) 27.03 5.62 ± 0.64 kJ/mol 173.8346 ± 74-95-3*0 1,1-Difluoroethene CH2CF2 (g) -343.62 -350.68 ± 0.63 kJ/mol 64.0341 ± 75-38-7*0 Indane C6H4(CH2CH2CH2) (g) 90.86 59.83 ± 0.76 kJ/mol 118.1757 ± 496-11-7*0 o-Tolualdehyde CH3C6H4C(O)H (g, ortho) -44.2 -66.4 ± 1.1 kJ/mol 120.1485 ± 529-20-4*0 Hypofluorite [FO]- (g) -108.84 -108.67 ± 0.48 kJ/mol 34.99835 ± 12763-66-5*0 3-Buten-2-one CH3C(O)CHCH2 (g, trans) -95.30 -111.54 ± 0.85 kJ/mol 70.0898 ± 78-94-4*1 Urea NH2C(O)NH2 (g) -218.16 -234.56 ± 0.42 kJ/mol 60.05534 ± 57-13-6*0 Oxomethaniminium [NH2CO]+ (g) 695.33 688.77 ± 0.89 kJ/mol 44.03217 ± 59348-22-0*0 Acetamide CH3C(O)NH2 (g) -219.63 -237.14 ± 0.56 kJ/mol 59.0672 ± 60-35-5*0 1-Cyanovinyl CH2CCN (g) 419.0 418.9 ± 1.1 kJ/mol 52.0547 ± 15091-87-9*0 1,3-Hexadiyne HCCCCCH2CH3 (g) 405.21 393.51 ± 0.94 kJ/mol 78.1118 ± 4447-21-6*0 (E)-1-Methylallyl CH3CHCHCH2 (g, trans) 152.66 135.35 ± 0.79 kJ/mol 55.0984 ± 17787-86-9*0 Sulfuric acid OS(O)(OH)2 (aq, 1000 H2O) -892.23 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*839 Iodine monochloride ICl (g) 19.024 17.391 ± 0.013 kJ/mol 162.35717 ± 7790-99-0*0 Hypoiodite [IO]- (g) -102.38 -104.20 ± 0.88 kJ/mol 142.90442 ± 15065-65-3*0 Nitrogen atom cation N+ (g) 1872.911 1875.692 ± 0.022 kJ/mol 14.006191 ± 14158-23-7*0 Trinitrogen cation [NNN]+ (g) 1519.59 1516.96 ± 0.89 kJ/mol 42.01967 ± 12185-03-4*0 Oxonitrate anion [NO]- (g) 88.10 88.14 ± 0.25 kJ/mol 30.00669 ± 14967-78-3*0 Nitrogen sesquioxide ONN(O)O (g) 90.73 86.17 ± 0.15 kJ/mol 76.01168 ± 10544-73-7*0 Hexafluoroethane CF3CF3 (g) -1334.08 -1342.38 ± 0.80 kJ/mol 138.0118 ± 76-16-4*0 Methyliumyl [CH2]+ (g) 1393.200 1394.059 ± 0.099 kJ/mol 14.02603 ± 15091-72-2*0 Methylene anion [CH2]- (g) 328.17 328.60 ± 0.18 kJ/mol 14.02713 ± 50928-07-9*0 Methylidyne anion [CH]- (g) 475.76 479.08 ± 0.21 kJ/mol 13.01919 ± 28604-54-8*0 Ethanium [C2H7]+ (g, bridged C2) 874.37 858.11 ± 0.61 kJ/mol 31.0764 ± 24669-33-8*1 Chloronium [HClH]+ (g) 881.5 878.4 ± 1.1 kJ/mol 37.46803 ± 36658-55-6*0 Chlorine atom cation Cl+ (g) 1370.807 1372.603 ± 0.0021 kJ/mol 35.45215 ± 24203-47-2*0 Methylperoxy anion [CH3OO]- (g) -89.69 -99.83 ± 0.45 kJ/mol 47.0339 ± 35683-44-4*0 Cyclobutane CH2(CH2CH2CH2) (g) 52.24 27.70 ± 0.36 kJ/mol 56.1063 ± 287-23-0*0 2-Butynyl CH3CCCH2 (g) 318.15 310.79 ± 0.66 kJ/mol 53.0825 ± 82252-88-8*0 1,2-Butadienyl CH3CHCCH (g) 328.95 320.23 ± 0.63 kJ/mol 53.0825 ± 4777-46-2*0 Isoprene CH2C(CH3)CHCH2 (g) 96.27 75.75 ± 0.66 kJ/mol 68.1170 ± 78-79-5*0 Chlorine trifluoride FCl(F)F (g) -158.63 -162.73 ± 0.86 kJ/mol 92.44791 ± 7790-91-2*0 Oxirene O(CHCH) (g, singlet) 272.43 270.27 ± 0.60 kJ/mol 42.0367 ± 157-18-6*2 Ethynol HCCOH (g, singlet) 95.30 92.81 ± 0.73 kJ/mol 42.0367 ± 32038-79-2*2 Dihydroxymethyl CH(OH)2 (g, syn-anti) -196.9 -206.3 ± 1.1 kJ/mol 47.0333 ± 14840-85-8*1 Formyloxidanyl HC(O)O (g, 2A1) -125.77 -127.43 ± 0.55 kJ/mol 45.0174 ± 16499-21-1*1 Methoxyethane CH3CH2OCH3 (g) -194.32 -217.21 ± 0.52 kJ/mol 60.0950 ± 540-67-0*0 Acetate [CH3C(O)O]- (g) -495.96 -505.09 ± 0.79 kJ/mol 59.0446 ± 71-50-1*0 Cyanoamidogen anion [HNCN]- (g, singlet) 69.72 66.72 ± 0.72 kJ/mol 41.03267 ± 67131-47-9*2 1,1,1-Trichloroethane CH3CCl3 (g) -134.00 -144.57 ± 0.51 kJ/mol 133.4033 ± 71-55-6*0 Tetrachloroethene CCl2CCl2 (g) -20.56 -21.43 ± 0.99 kJ/mol 165.8322 ± 127-18-4*0 Chlorodifluoromethane CHClF2 (g) -475.58 -481.78 ± 0.99 kJ/mol 86.4681 ± 75-45-6*0 Fluoromethylene CHF (g, singlet) 148.39 148.68 ± 0.43 kJ/mol 32.01704 ± 13453-52-6*2 Fluoroformyl FCO (g) -176.62 -176.04 ± 0.37 kJ/mol 47.00850 ± 1871-24-5*0 2-Bromoethanol BrCH2CH2OH (g) -196.00 -220.07 ± 0.52 kJ/mol 124.9645 ± 540-51-2*0 Carbon suboxide OCCCO (g) -94.42 -92.31 ± 0.96 kJ/mol 68.0309 ± 504-64-3*0 Ethylbenzene C6H5CH2CH3 (g) 58.41 29.94 ± 0.52 kJ/mol 106.1650 ± 100-41-4*0 m-Tolualdehyde CH3C6H4C(O)H (g, meta) -48.5 -71.3 ± 1.2 kJ/mol 120.1485 ± 620-23-5*0 3-Oxo-1-propenyl CHCHCHO (g, anti-trans) 190.96 184.93 ± 0.91 kJ/mol 55.0553 ± 206255-29-0*11 2-Propynal CHCCHO (g) 135.51 133.34 ± 0.87 kJ/mol 54.0474 ± 624-67-9*0 Cyanomethylene HCCN (g, triplet) 479.6 483.0 ± 1.1 kJ/mol 39.0361 ± 2612-62-6*1 3-Methylenecyclopropene CH2C(CHCH) (g) 396.08 388.15 ± 0.81 kJ/mol 52.0746 ± 4095-06-1*0 Phenylperoxy C6H5OO (g) 153.9 136.9 ± 1.4 kJ/mol 109.1027 ± 91422-02-5*0 Fluorosilylidyne SiF (g, doublet) -60.32 -58.48 ± 0.62 kJ/mol 47.08390 ± 11128-24-8*1 Silylidyne SiH (g) 371.23 373.03 ± 0.67 kJ/mol 29.09344 ± 13774-94-2*0 Bromosilane SiH3Br (g) -59.0 -75.5 ± 1.4 kJ/mol 111.0133 ± 13465-73-1*0 Bromotrimethylsilane SiBr(CH3)3 (g) -259.4 -290.1 ± 2.0 kJ/mol 153.0931 ± 2857-97-8*0 Trimethylsilylium [Si(CH3)3]+ (g) 655.4 634.8 ± 1.9 kJ/mol 73.1885 ± 28927-31-3*0 1-Methyl-1-propenyl CH3CCHCH3 (g, trans) 240.10 223.93 ± 0.66 kJ/mol 55.0984 ± 71790-71-1*1 1-Butenyl CH3CH2CHCH (g, cis) 263.46 246.12 ± 0.68 kJ/mol 55.0984 ± 2669-61-6*2 Sulfur monoxide SO (g) 5.95 6.00 ± 0.13 kJ/mol 48.0654 ± 13827-32-2*0 Hydrogen peroxide cation [HOOH]+ (g, trans) 897.29 890.31 ± 0.51 kJ/mol 34.01413 ± 12325-10-9*1 Ammonium [NH4]+ (aq) -133.076 ± 0.056 kJ/mol 18.03795 ± 14798-03-9*800 Oxygen atom O (g, triplet) 246.844 249.229 ± 0.0021 kJ/mol 15.99940 ± 17778-80-2*1 Ethylidyne CH3C (g, quartet) 640.8 636.3 ± 1.1 kJ/mol 27.0452 ± 67624-57-1*2 Isocyanomethanide [CH2NC]- (g) 253.98 250.94 ± 0.89 kJ/mol 40.0446 ± 81704-80-5*0 Peroxyformate [HC(O)OO]- (g, syn) -340.95 -346.40 ± 0.80 kJ/mol 61.0174 ± 104960-05-6*1 1-Methylethylidene CH3CCH3 (g, singlet) 316.06 302.15 ± 0.97 kJ/mol 42.0797 ± 40852-89-9*2 Propylidene CH3CH2CH (g, triplet gauche) 349.49 335.80 ± 0.92 kJ/mol 42.0797 ± 6700-78-3*11 Cycloprop-2-enylium [CH(CHCH)]+ (g) 1080.45 1075.35 ± 0.99 kJ/mol 39.0554 ± 26810-74-2*0 Cyclobutene CH2(CH2CHCH) (g) 178.08 161.03 ± 0.60 kJ/mol 54.0904 ± 822-35-5*0 1,3-Butadienyl CH2CHCHCH (g, trans-trans) 372.27 361.79 ± 0.87 kJ/mol 53.0825 ± 86181-68-2*11 Cyclohexane CH2(CH2CH2CH2CH2CH2) (g) -83.23 -122.80 ± 0.29 kJ/mol 84.1595 ± 110-82-7*0 Protonated oxirane [(CH2CH2)OH]+ (g) 725.72 709.55 ± 0.61 kJ/mol 45.0600 ± *38607-31-7*0 Methoxymethyl CH3OCH2 (g) 13.45 0.88 ± 0.86 kJ/mol 45.0605 ± 16520-04-0*0 Methoxymethylene CH3OCH (g, anti singlet) 129.24 118.71 ± 0.78 kJ/mol 44.0526 ± 19527-10-7*21 Oxirene O(CHCH) (g, t-triplet) 387.8 383.5 ± 1.3 kJ/mol 42.0367 ± 157-18-6*11 Diethyl ether CH3CH2OCH2CH3 (g) -222.84 -250.27 ± 0.74 kJ/mol 74.1216 ± 60-29-7*0 Cyanic acid HOCN (g) -12.32 -15.03 ± 0.43 kJ/mol 43.02478 ± 420-05-3*0 Fulminic acid HCNO (g) 170.72 169.27 ± 0.44 kJ/mol 43.02478 ± 51060-05-0*0 Isofulminic acid HONC (g) 235.25 233.54 ± 0.43 kJ/mol 43.02478 ± 506-85-4*0 Nitrosomethylidyne CNO (g) 389.3 390.7 ± 1.1 kJ/mol 42.01684 ± 82267-15-0*0 Acetyl chloride CH3C(O)Cl (g) -232.52 -241.51 ± 0.39 kJ/mol 78.4973 ± 75-36-5*0 Dioxoethyl OCHCO (g) -63.27 -64.69 ± 0.86 kJ/mol 57.0281 ± 702699-38-5*0 Trioxidanide [HOOO]- (g, gauche) -120.3 -123.4 ± 1.6 kJ/mol 49.00669 ± 89965-38-8*2 Chlorohydroxymethyl CH(Cl)OH (g, syn-gauche) -54.7 -60.7 ± 1.1 kJ/mol 65.4787 ± 147139-06-8*1 1,1-Dichloroethene CH2CCl2 (g) 9.28 3.30 ± 0.50 kJ/mol 96.9427 ± 75-35-4*0 Dichlorodifluoromethane CF2Cl2 (g) -488.89 -493.08 ± 0.44 kJ/mol 120.9129 ± 75-71-8*0 Fluorodichloromethane CHFCl2 (g) -277.64 -283.09 ± 0.90 kJ/mol 102.9224 ± 75-43-4*0 Difluoromethylene CF2 (g, singlet) -193.90 -193.42 ± 0.35 kJ/mol 50.00751 ± 2154-59-8*2 Fluoromethylene CHF (g, triplet) 210.36 210.70 ± 0.65 kJ/mol 32.01704 ± 13453-52-6*1 Formyl fluoride CHFO (g) -378.64 -382.23 ± 0.31 kJ/mol 48.01644 ± 1493-02-3*0 Fulvenallene CH2CC(CHCHCHCH) (g, singlet) 368.6 354.3 ± 1.1 kJ/mol 90.1225 ± 27041-32-3*2 Tropyl CH(CHCHCHCHCHCH) (g) 296.84 279.41 ± 0.94 kJ/mol 91.1305 ± 3551-27-7*0 p-Tolualdehyde CH3C6H4C(O)H (g, para) -49.2 -72.2 ± 1.2 kJ/mol 120.1485 ± 104-87-0*0 o-Toluoyl CH3C6H4CO (g, ortho) 110.3 91.9 ± 1.4 kJ/mol 119.1406 ± 104680-89-9*0 Sulfur dioxide anion [OSO]- (g) -401.27 -403.53 ± 0.73 kJ/mol 64.0653 ± 12143-17-8*0 2-Hydroxyprop-1-en-1-yl CH3C(OH)CH (g, trans-cis) 101.62 89.40 ± 0.86 kJ/mol 57.0712 ± 1976041-84-5*11 Propyl nitrite CH3CH2CH2ONO (g, gauche-trans-cis) -95.7 -120.7 ± 1.8 kJ/mol 89.0932 ± 543-67-9*1 1-Formylethenyl CH2CCHO (g) 177.60 172.07 ± 0.80 kJ/mol 55.0553 ± 191018-90-3*0 2-Cyanovinyl CHCHCN (g, syn) 447.83 445.34 ± 0.98 kJ/mol 52.0547 ± 189141-20-6*2 1,2,3-Butatrien-1-ylium [CH2CCCH]+ (g, singlet) 1271.9 1270.1 ± 1.1 kJ/mol 51.0661 ± 81932-79-8*2 1-Buten-3-yn-1-yl HCCCHCH (g, trans) 547.36 544.70 ± 0.84 kJ/mol 51.0666 ± 2810-61-9*1 3-Buten-1-ynyl CH2CHCC (g) 628.61 626.42 ± 0.99 kJ/mol 51.0666 ± 108179-98-2*0 Methylsilane CH3SiH3 (g) -9.83 -26.00 ± 0.89 kJ/mol 46.14384 ± 992-94-9*0 Fluorosilane SiH3F (g) -346.20 -355.59 ± 0.72 kJ/mol 50.10772 ± 13537-33-2*0 Chlorosilane SiH3Cl (g) -126.5 -135.5 ± 1.4 kJ/mol 66.56202 ± 13465-78-6*0 Tetramethylsilane Si(CH3)4 (g) -185.8 -216.3 ± 1.9 kJ/mol 88.2236 ± 75-76-3*0 Hydroxysilyl SiH2OH (g) -104.1 -112.0 ± 1.5 kJ/mol 47.10872 ± 113648-09-2*0 Trimethylsilanol (CH3)3SiOH (g) -465.3 -491.6 ± 1.9 kJ/mol 90.1964 ± 1066-40-6*0 2-Aminoethyl CH2CH2NH2 (g) 174.45 157.99 ± 0.83 kJ/mol 44.0758 ± 4422-53-1*0 2-Propanamine CH3CH(CH3)NH2 (g) -56.66 -83.45 ± 0.52 kJ/mol 59.1103 ± 75-31-0*0 Sulfuric acid OS(O)(OH)2 (g) -715.5 -729.7 ± 1.1 kJ/mol 98.0795 ± 7664-93-9*0 Hydroperoxonium [H2OOH]+ (g, trans) 738.2 727.9 ± 1.2 kJ/mol 35.02207 ± 70850-26-9*1 Dinitrogen cation [N2]+ (g) 1503.311 1503.312 ± 0.000 kJ/mol 28.01293 ± 13966-04-6*0 Nitrogen atom N (g, quartet) 470.583 472.445 ± 0.022 kJ/mol 14.006740 ± 17778-88-0*1 Carbon dioxide cation [CO2]+ (g) 936.089 936.924 ± 0.017 kJ/mol 44.00895 ± 12181-61-2*0 Xenon cation Xe+ (g) 1170.354 1170.354 ± 0.0062 kJ/mol 131.2895 ± 24203-25-6*0 Nitroxyl ON(O)O (g) 79.38 74.12 ± 0.19 kJ/mol 62.00494 ± 12033-49-7*0 Hydrazino NH2NH (g) 234.79 224.26 ± 0.69 kJ/mol 31.03730 ± 13598-46-4*0 Dichloride [Cl2]- (g) -231.91 -230.84 ± 0.34 kJ/mol 70.9059 ± 12595-89-0*0 Nitryl hydride HN(O)O (g) -36.74 -43.71 ± 0.84 kJ/mol 47.01348 ± 90266-90-3*0 Carbon anion C- (g) 589.605 594.751 ± 0.039 kJ/mol 12.01125 ± 14337-00-9*0 Oxoniumyl ion [H2O]+ (g) 978.492 975.589 ± 0.024 kJ/mol 18.01473 ± 56583-62-1*0 Chloro hypochlorite ClOCl (g) 79.79 77.98 ± 0.36 kJ/mol 86.9048 ± 7791-21-1*0 Hydrogen isocyanide cation [HNC]+ (g) 1351.52 1351.48 ± 0.83 kJ/mol 27.02483 ± 74158-11-5*0 Cyanomethanide [CH2CN]- (g) 113.68 110.85 ± 0.53 kJ/mol 40.0446 ± 21438-99-3*0 Methyloxonium [CH3OH2]+ (g) 589.2 575.0 ± 1.1 kJ/mol 33.04925 ± 17836-08-7*0 n-Propylide [CH3CH2CH2]- (g) 123.1 105.4 ± 1.2 kJ/mol 43.0882 ± 59513-13-2*0 Allyl anion [CH2CHCH2]- (g) 134.00 122.99 ± 0.21 kJ/mol 41.0723 ± 1724-46-5*0 Propargylenide [HCCCH]- (g, transoid 2B) 434.5 437.0 ± 1.1 kJ/mol 38.0485 ± 82906-05-6*1 2-Butyn-1-yl anion [CH3CCCH2]- (g) 253.7 244.9 ± 1.1 kJ/mol 53.0830 ± 65114-66-1*0 Chlorooxy hypochlorite ClOOCl (g) 134.57 131.34 ± 0.56 kJ/mol 102.9042 ± 12292-23-8*0 Cycloheptatriene CH2(CHCHCHCHCHCH) (g) 207.79 184.37 ± 0.90 kJ/mol 92.1384 ± 544-25-2*0 n-Octane CH3(CH2)6CH3 (g) -161.08 -207.91 ± 0.51 kJ/mol 114.2285 ± 111-65-9*0 Ethoxy CH3CH2O (g, A 2A') 5.61 -8.82 ± 0.43 kJ/mol 45.0605 ± 2154-50-9*52 Dioxygen O2 (g, triplet) 0.000 0.000 ± 0.000 kJ/mol 31.99880 ± 7782-44-7*1 Ethenol CH2CHOH (g, anti) -108.86 -119.57 ± 0.49 kJ/mol 44.0526 ± 557-75-5*2 Hydroperoxymethyl CH2OOH (g) 73.26 65.96 ± 0.97 kJ/mol 47.0333 ± 74087-87-9*0 Ketene CH2CO (g, singlet) -45.34 -48.40 ± 0.11 kJ/mol 42.0367 ± 463-51-4*2 Oxiranyl CH2(CHO) (g) 172.80 164.52 ± 0.98 kJ/mol 43.0446 ± 31586-84-2*0 Ketene CH2CO (g, triplet) 182.0 179.0 ± 1.1 kJ/mol 42.0367 ± 463-51-4*1 Oxoethylidene HCC(O)H (g, syn-triplet) 261.1 257.6 ± 1.1 kJ/mol 42.0367 ± 39920-84-8*12 Chlorine pentafluoride FCl(F)(F)(F)F (g) -226.0 -234.1 ± 1.3 kJ/mol 130.44472 ± 13637-63-3*0 Methoxyethene CH2CHOCH3 (g, cis) -89.3 -107.1 ± 1.1 kJ/mol 58.0791 ± 107-25-5*2 2-Propanol CH3CH(OH)CH3 (g) -248.62 -272.71 ± 0.26 kJ/mol 60.0950 ± 67-63-0*0 Methyl acetate CH3C(O)OCH3 (g, anti) -363.3 -382.0 ± 1.2 kJ/mol 74.0785 ± 79-20-9*2 Carboxymethyl CH2C(O)OH (g, syn) -226.6 -236.4 ± 1.1 kJ/mol 59.0440 ± 2887-46-9*1 1-Iminoethyl CH3CNH (g, anti) 233.1 223.0 ± 1.1 kJ/mol 42.0599 ± 128365-64-0*2 1-Aminoethenyl CH2CNH2 (g) 294.70 286.07 ± 0.92 kJ/mol 42.0599 ± 180385-92-6*0 Nitrilomethylimidogen NCHN (g, quartet) 581.6 578.4 ± 1.5 kJ/mol 41.03212 ± 324529-58-0*2 Cyanoacetylide [CCCN]- (g) 300.4 305.6 ± 1.1 kJ/mol 50.0394 ± 12373-53-4*0 Chloromethylidyne CCl (g) 430.62 434.38 ± 0.67 kJ/mol 47.4634 ± 3889-76-7*0 Chloromethanol CH2(Cl)OH (g) -232.3 -242.5 ± 1.2 kJ/mol 66.4866 ± 15454-33-8*0 Chloromethoxy CH2(Cl)O (g) -11.9 -18.7 ± 1.1 kJ/mol 65.4787 ± 114282-89-2*0 Peroxyhypochlorous acid HOOCl (g) 3.97 -1.30 ± 0.95 kJ/mol 68.4594 ± 67952-07-2*0 Fluorotrichloromethane CCl3F (g) -283.25 -286.40 ± 0.76 kJ/mol 137.3672 ± 75-69-4*0 Formyl chloride CHClO (g) -179.87 -183.08 ± 0.67 kJ/mol 64.4707 ± 2565-30-2*0 2-Chloroethanol ClCH2CH2OH (g) -249.79 -266.51 ± 0.59 kJ/mol 80.5132 ± 107-07-3*0 Butadiynyl CCCCH (g) 801.86 808.46 ± 0.96 kJ/mol 49.0507 ± 53561-65-2*0 o-Benzyne C6H4 (g, singlet) 468.19 459.27 ± 0.85 kJ/mol 76.0960 ± 462-80-6*2 m-Toluoyl CH3C6H4CO (g, meta) 109.3 90.8 ± 1.4 kJ/mol 119.1406 ± 67958-04-7*0 Iodobenzene C6H5I (g) 178.59 162.60 ± 0.99 kJ/mol 204.0084 ± 591-50-4*0 Furan O(CHCHCHCH) (g) -21.40 -34.53 ± 0.94 kJ/mol 68.0740 ± 110-00-9*0 1-Hydroxy-1-methylethyl CH3C(OH)CH3 (g) -78.24 -96.48 ± 0.79 kJ/mol 59.0871 ± 5131-95-3*0 Trifluoroethene CF2CHF (g) -493.5 -498.5 ± 1.4 kJ/mol 82.0245 ± 359-11-5*0 Isocyanoethene CH2CHNC (g) 285.29 278.79 ± 0.92 kJ/mol 53.0627 ± 14668-82-7*0 1-Isocyanoethylidene CH3CNC (g, singlet) 527.9 523.2 ± 1.1 kJ/mol 53.0627 ± *498544-34-6*2 2-Cyanovinyl CHCHCN (g, anti) 448.26 445.80 ± 0.97 kJ/mol 52.0547 ± 189141-20-6*1 3-Methylene-1-cyclopropen-1-yl CH2C(CHC) (g) 628.3 625.7 ± 1.1 kJ/mol 51.0666 ± 127611-24-9*0 Oxosilylene SiO (g) -98.37 -97.22 ± 0.54 kJ/mol 44.08490 ± 10097-28-6*0 Silyloxy anion [SiH3O]- (g) -311.8 -321.1 ± 1.6 kJ/mol 47.10927 ± 43336-62-5*0 Cyclobutyl CH(CH2CH2CH2) (g) 246.57 227.66 ± 0.72 kJ/mol 55.0984 ± 4548-06-5*0 1-Ethynyl-2-propyn-1-yl CHCCHCCH (g) 577.05 575.43 ± 0.99 kJ/mol 63.0773 ± 78596-35-7*0 1-Propanamine CH3CH2CH2NH2 (g) -42.22 -69.96 ± 0.42 kJ/mol 59.1103 ± 107-10-8*0 Sulfurous acid S(O)(OH)2 (g, cis) -511.32 -521.53 ± 0.89 kJ/mol 82.0801 ± 7782-99-2*2 Sulfo OS(OH)O (g) -366.9 -374.7 ± 1.1 kJ/mol 81.0721 ± 32750-86-0*0 Fluoronium [HFH]+ (g, singlet) 774.04 771.10 ± 0.91 kJ/mol 21.01373 ± 12206-67-6*2 Dioxodiazoxane ONONO (g, t, t) 93.0 87.9 ± 1.3 kJ/mol 76.01168 ± 122413-35-8*1 Nitric acid HON(O)O (aq) -206.55 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*800 Isodiazene NNH2 (g) 307.57 300.49 ± 0.60 kJ/mol 30.02936 ± 28647-38-3*0 Oxoammoniumyl [HNO]+ (g) 1092.47 1089.54 ± 0.67 kJ/mol 31.01353 ± 63559-87-5*0 Peroxynitrous acid HOONO (g, trans, perp) 7.83 0.75 ± 0.41 kJ/mol 63.01288 ± 14691-52-2*1 Peroxynitric acid HOON(O)O (g) -41.46 -51.77 ± 0.32 kJ/mol 79.0123 ± 26404-66-0*0 Water dimer (H2O)2 (g) -491.034 -499.073 ± 0.044 kJ/mol 36.03056 ± 25655-83-8*0 Tetrafluorohydrazine NF2NF2 (g, trans) -13.4 -22.9 ± 1.4 kJ/mol 104.00709 ± 10036-47-2*1 Carbon cation C+ (g) 1797.834 1803.432 ± 0.039 kJ/mol 12.01015 ± 14067-05-1*0 Difluoride [F2]- (g) -290.6 -289.8 ± 1.3 kJ/mol 37.9973550 ± 12184-85-9*0 Trioxidane HOOOH (g, cis) -72.68 -81.17 ± 0.78 kJ/mol 50.01408 ± 14699-99-1*2 Ethylidyne CH3C (g) 508.62 504.92 ± 0.80 kJ/mol 27.0452 ± 67624-57-1*0 Ethynylium [CCH]+ (g) 1687.62 1690.95 ± 0.15 kJ/mol 25.0288 ± 16456-59-0*0 Methylamidogen anion [CH3NH]- (g) 145.40 134.57 ± 0.64 kJ/mol 30.04975 ± 54448-39-4*0 Methylimidogen CH3N (g) 323.0 315.3 ± 1.0 kJ/mol 29.04126 ± 27770-42-9*0 Iminomethylium [HCNH]+ (g) 953.4 949.3 ± 1.4 kJ/mol 28.03277 ± 196216-36-1*0 Chloride Cl- (aq) -166.990 ± 0.023 kJ/mol 35.45325 ± 16887-00-6*800 Hydrogen carbonate [HOC(O)O]- (g) -719.3 -725.7 ± 1.5 kJ/mol 61.0174 ± 71-52-3*0 Bromanylium Br+ (g) 1257.786 1251.723 ± 0.056 kJ/mol 79.90345 ± 22541-56-6*0 Cyclopropylide [CH(CH2CH2)]- (g) 265.4 252.6 ± 1.1 kJ/mol 41.0723 ± 1724-45-4*0 Propylidyne CH3CH2C (g, doublet) 492.7 483.0 ± 1.2 kJ/mol 41.0718 ± 85056-54-8*1 Cyclopropylidene C(CH2CH2) (g, singlet) 475.03 467.01 ± 0.84 kJ/mol 40.0639 ± 2143-70-6*1 Propargylium [CH2CCH]+ (g) 1193.55 1190.74 ± 0.31 kJ/mol 39.0554 ± 21540-27-2*0 Cycloprop-1-enyl CH2(CHC) (g) 527.49 523.10 ± 0.58 kJ/mol 39.0559 ± 19528-44-0*0 Cyclopropenylidene C(CHCH) (g) 497.06 496.09 ± 0.45 kJ/mol 38.0480 ± 16165-40-5*0 Propargylenide [HCCCH]- (g, cisoid 2A) 437.0 439.5 ± 1.1 kJ/mol 38.0485 ± 82906-05-6*2 2-Propyn-1-ylium-1-ylidene [CCCH]+ (g) 1598.46 1602.84 ± 0.90 kJ/mol 37.0395 ± 75104-46-0*0 sec-Butyl CH3CH2CHCH3 (g) 91.33 66.56 ± 0.71 kJ/mol 57.1143 ± 2348-55-2*0 iso-Butyl (CH3)2CHCH2 (g) 97.32 73.33 ± 0.78 kJ/mol 57.1143 ± 4630-45-9*0 1-Methylene-2-propenyl CH2CHCCH2 (g) 327.17 317.17 ± 0.74 kJ/mol 53.0825 ± 1204515-52-5*0 n-Heptane CH3(CH2)5CH3 (g) -145.42 -187.29 ± 0.44 kJ/mol 100.2019 ± 142-82-5*0 Iodine cation I+ (g) 1115.549 1115.149 ± 0.0062 kJ/mol 126.903921 ± 22541-93-1*0 Oxoethanide [CH3CO]- (g) -43.9 -49.5 ± 1.3 kJ/mol 43.0452 ± 78944-68-0*0 2-Hydroperoxyethyl CH2CH2OOH (g, gauche-syn) 64.7 50.4 ± 1.3 kJ/mol 61.0599 ± 126898-97-3*32 Methoxyoxomethyl CH3OCO (g, anti-staggered) -152.7 -160.8 ± 1.1 kJ/mol 59.0440 ± 16481-04-2*1 Hydroxyformyl HOCO (g, cis) -174.34 -177.37 ± 0.48 kJ/mol 45.0174 ± 2564-86-5*2 Hydroxyformyl anion [HOCO]- (g, cis) -319.54 -322.12 ± 0.56 kJ/mol 45.0180 ± 78944-70-4*2 Ethyl formate HC(O)OCH2CH3 (g, syn) -375.0 -393.8 ± 1.0 kJ/mol 74.0785 ± 109-94-4*1 Propionic acid CH3CH2C(O)OH (g, syn) -435.82 -453.72 ± 0.60 kJ/mol 74.0785 ± 79-09-4*1 (Methylimino)methyl CH3NCH (g, trans) 278.0 267.9 ± 1.1 kJ/mol 42.0599 ± 117928-23-1*1 1-Aziridinyl N(CH2CH2) (g) 314.0 301.8 ± 1.4 kJ/mol 42.0599 ± 23838-09-7*0 (Dimethylamino)methyl (CH3)2NCH2 (g) 166.4 143.4 ± 1.3 kJ/mol 58.1024 ± 30208-47-0*0 Cyanoamidogen HNCN (g, t-quartet) 652.4 649.6 ± 1.2 kJ/mol 41.03212 ± 12347-01-2*21 Diazomethyl HCNN (g, c-quartet) 652.7 649.7 ± 1.3 kJ/mol 41.03212 ± 20813-32-5*22 Diazomethanide [HCNN]- (g, singlet) 305.17 302.08 ± 0.76 kJ/mol 41.03267 ± 100840-43-5*2 Isocyanoamidogen HNNC (g, c-quartet) 828.2 825.4 ± 1.3 kJ/mol 41.03212 ± 947408-73-3*22 Ethylamidogen anion [CH3CH2NH]- (g) 106.51 88.86 ± 0.80 kJ/mol 44.0763 ± 54448-40-7*0 Chloromethide [CH2Cl]- (g) 56.3 53.0 ± 2.0 kJ/mol 49.4798 ± 60291-29-4*0 Hexachloroethane CCl3CCl3 (g) -144.2 -146.6 ± 1.3 kJ/mol 236.7376 ± 67-72-1*0 cis-1,2-Dichloroethene CHClCHCl (g, cis) 3.80 -2.20 ± 0.55 kJ/mol 96.9427 ± 156-59-2*0 Dichloroacetylene ClCCCl (g) 232.79 236.10 ± 0.72 kJ/mol 94.9268 ± 7572-29-4*0 Tetraiodomethane CI4 (g) 323.5 318.4 ± 1.1 kJ/mol 519.62858 ± 507-25-5*0 Difluoromethylene CF2 (g) -193.90 -193.42 ± 0.35 kJ/mol 50.00751 ± 2154-59-8*0 1,1-Difluoroethane CH3CHF2 (g) -489.02 -502.74 ± 0.53 kJ/mol 66.0500 ± 75-37-6*0 2-Fluoroethanol FCH2CH2OH (g) -405.65 -422.89 ± 0.99 kJ/mol 64.0589 ± 371-62-0*0 1,3,5-Hexatriyne HCCCCCCH (g) 682.1 686.9 ± 1.2 kJ/mol 74.0801 ± 3161-99-7*0 2-Hydrotrioxy OO(H)O (g) 299.4 293.7 ± 1.2 kJ/mol 49.00614 ± *12500-78-6*0 Benzylide [C6H5CH2]- (g) 141.98 123.07 ± 0.39 kJ/mol 91.1310 ± 18860-15-6*0 Benzylidene C6H5CH (g, singlet) 489.6 474.4 ± 1.1 kJ/mol 90.1225 ± 3101-08-4*2 Norbornadiene (CHCH)(CHCH2CH)(CHCH) (g) 265.0 239.5 ± 1.5 kJ/mol 92.1384 ± 121-46-0*0 Benzonitrile C6H5CN (g) 229.99 215.79 ± 0.92 kJ/mol 103.1213 ± 100-47-0*0 p-Toluoyl CH3C6H4CO (g, para) 108.4 89.8 ± 1.4 kJ/mol 119.1406 ± 67958-03-6*0 Acetonate [CH3C(O)CH2]- (g) -187.54 -201.09 ± 0.92 kJ/mol 57.0717 ± 24262-31-5*0 Methyl nitrite CH3ONO (g) -55.43 -66.10 ± 0.43 kJ/mol 61.0401 ± 624-91-9*0 Acryloyl CH2CHCO (g, 2A") 102.79 97.19 ± 0.98 kJ/mol 55.0553 ± 72241-20-4*2 3-Oxo-1,2-propadien-1-yl HCCCO (g) 290.34 292.85 ± 0.95 kJ/mol 53.0394 ± 1198096-74-0*0 Perchloryl OCl(O)O (g) 191.77 186.10 ± 0.62 kJ/mol 83.4509 ± 13932-10-0*0 1-Cyanoethylidene CH3CCN (g, singlet) 475.7 470.6 ± 1.1 kJ/mol 53.0627 ± 498544-34-6*2 3-Imino-2-propen-1-ylidene CHCHCNH (g, syn-singlet) 530.7 525.9 ± 1.2 kJ/mol 53.0627 ± 916765-05-4*11 2-(Methylidyneamino)ethenyl CHCHNCH (g, anti-singlet) 600.7 595.6 ± 1.2 kJ/mol 53.0627 ± 123416-74-0*11 Chlorate [OCl(O)O]- (g) -208.2 -213.7 ± 1.4 kJ/mol 83.4514 ± 14866-68-3*0 1-Cyanovinyl anion [CH2CCN]- (g) 224.3 221.5 ± 1.2 kJ/mol 52.0553 ± 36259-97-9*0 Chloric acid HOCl(O)O (g) 0.6 -6.5 ± 1.1 kJ/mol 84.4588 ± 7790-93-4*0 1,2,3-Butatrien-1-yl anion [CH2CCCH]- (g) 388.5 386.6 ± 1.1 kJ/mol 51.0672 ± 102275-54-7*0 Difluorosilylene SiF2 (g, singlet) -629.1 -630.0 ± 1.3 kJ/mol 66.08231 ± 13966-66-0*2 Silylene SiH2 (g, triplet) 361.95 360.34 ± 0.99 kJ/mol 30.10138 ± 13825-90-6*1 Di-mu-hydrodihydrodisilicon HSi(HSiHH) (g, trans-singlet) 374.8 364.4 ± 2.3 kJ/mol 60.20276 ± 129970-82-7*12 Trimethylsiloxy (CH3)3SiO (g) -188.1 -211.1 ± 1.9 kJ/mol 89.1885 ± 54572-10-0*0 1,5-Hexadiyne HCCCH2CH2CCH (g) 431.6 421.1 ± 1.2 kJ/mol 78.1118 ± 628-16-0*0 2-Methylallyl CH3C(CH2)CH2 (g) 155.94 138.82 ± 0.77 kJ/mol 55.0984 ± 15157-95-6*0 3-Butenyl CH2CHCH2CH2 (g) 223.24 206.73 ± 0.90 kJ/mol 55.0984 ± 2154-62-3*0 2-Methyl-1-propenyl CH3C(CH3)CH (g) 251.24 234.22 ± 0.72 kJ/mol 55.0984 ± 33825-33-1*0 N-Methylethanamine CH3CH2NHCH3 (g) -17.5 -45.6 ± 1.1 kJ/mol 59.1103 ± 624-78-2*0 Phenanthrene C6H4(C2H2(CC(C4H4))) (g) 231.97 203.16 ± 0.75 kJ/mol 178.2292 ± 85-01-8*0 Disulfene oxide SSO (g) -50.62 -52.63 ± 0.43 kJ/mol 80.1314 ± 20901-21-7*0 Sulfur hydroxide oxide OHS(O)(O)O (g, staggered) -474.5 -483.9 ± 1.6 kJ/mol 97.0715 ± 12337-07-4*1 Ethanethiol CH3CH2SH (g) -28.76 -45.58 ± 0.38 kJ/mol 62.1350 ± 75-08-1*0 Dinitrogen tetraoxide O2NNO2 (g) 20.17 10.88 ± 0.14 kJ/mol 92.0111 ± 10544-72-6*0 Azanylium [NH3]+ (g) 944.273 937.319 ± 0.029 kJ/mol 17.03001 ± 19496-55-0*0 Hydrogen fluoride HF (aq, 5500 H2O) -324.55 ± 0.13 kJ/mol 20.006343 ± 7664-39-3*955 Difluoroamidogen NF2 (g) 36.24 33.66 ± 0.63 kJ/mol 52.003546 ± 3744-07-8*0 Fluoroimidogen NF (g, triplet) 232.64 232.63 ± 0.80 kJ/mol 33.005143 ± 13967-06-1*1 Oxygen atom O (g, singlet) 436.665 438.523 ± 0.0021 kJ/mol 15.99940 ± 17778-80-2*2 Bromochlorane BrCl (g) 21.891 14.447 ± 0.059 kJ/mol 115.3567 ± 13863-41-7*0 Methyliumylidene [CH]+ (g) 1619.738 1623.081 ± 0.039 kJ/mol 13.01809 ± 24361-82-8*0 Ethylidyne CH3C (g, doublet) 508.62 504.92 ± 0.80 kJ/mol 27.0452 ± 67624-57-1*1 Oxidanylium [OH]+ (g) 1293.362 1293.391 ± 0.026 kJ/mol 17.00679 ± 12259-29-9*0 Vinylidene anion [CCH2]- (g) 364.25 364.06 ± 0.31 kJ/mol 26.0378 ± 66295-36-1*0 Iodine monobromide IBr (g) 49.727 40.780 ± 0.066 kJ/mol 206.8085 ± 7789-33-5*0 Methanol cation [CH3OH]+ (g) 856.93 846.61 ± 0.32 kJ/mol 32.04131 ± 12538-91-9*0 Hydroxymethylene HCOH (g, gauche triplet) 219.3 216.4 ± 1.1 kJ/mol 30.02598 ± 19710-56-6*3 Aquacarbon H2OC (g, triplet) 442.7 441.1 ± 1.3 kJ/mol 30.02598 ± 81434-73-3*1 Carbonic acid C(O)(OH)2 (g, cis-trans) -596.48 -606.59 ± 0.74 kJ/mol 62.0248 ± 463-79-6*2 Carbonic acid C(O)(OH)2 (g, trans-trans) -561.30 -570.14 ± 0.91 kJ/mol 62.0248 ± 463-79-6*3 Hydroperoxycarbonyl HOOCO (g) -73.25 -77.11 ± 0.97 kJ/mol 61.0168 ± 153751-35-0*0 1,3-Dioxolan-2-one C(O)(OCH2CH2O) (g) -492.62 -510.27 ± 0.85 kJ/mol 88.0621 ± 96-49-1*0 Pyruvic acid CH3C(O)C(O)OH (g) -520.58 -534.92 ± 0.97 kJ/mol 88.0621 ± 127-17-3*0 Dimethyl carbonate C(O)(OCH3)2 (g, cis-cis) -550.04 -570.59 ± 0.37 kJ/mol 90.0779 ± 616-38-6*1 Allylium [CH2CHCH2]+ (g) 964.46 952.90 ± 0.33 kJ/mol 41.0713 ± 1724-44-3*0 Propylidyne CH3CH2C (g, quartet) 624.8 613.3 ± 1.3 kJ/mol 41.0718 ± 85056-54-8*2 1-Propynyl CH3CC (g) 528.54 526.37 ± 0.65 kJ/mol 39.0559 ± 89342-91-6*0 1-Propynylide [CH3CC]- (g) 264.60 261.02 ± 0.66 kJ/mol 39.0565 ± 36147-87-2*0 1-Propen-1-yl-3-ylidene CHCHCH (g, c-c quartet) 656.7 653.3 ± 1.1 kJ/mol 39.0559 ± 84654-90-0*11 t-Butyl anion [(CH3)3C]- (g) 76.8 52.1 ± 1.3 kJ/mol 57.1148 ± 65114-21-8*0 Methylcyclopropane CH3CH(CH2CH2) (g) 47.4 24.2 ± 1.2 kJ/mol 56.1063 ± 594-11-6*0 5-Ethenyl-1,3-cyclopentadiene CH2CHCH(CHCHCHCH) (g, perp) 237.1 215.4 ± 1.4 kJ/mol 92.1384 ± 29647-85-6*1 Tetroxidane HOOOOH (g, C1) -33.33 -44.00 ± 0.44 kJ/mol 66.0135 ± 29683-94-1*21 Iodine I (g, 2P3/2) 107.157 106.757 ± 0.0021 kJ/mol 126.904470 ± 14362-44-8*1 2-Hydroxyethenyl CHCHOH (g, trans-cis) 138.00 131.26 ± 0.72 kJ/mol 43.0446 ± 108665-16-3*21 Oxiranylidene CH2(CO) (g, singlet) 213.5 209.2 ± 1.4 kJ/mol 42.0367 ± 50983-85-2*2 1-Hydroperoxyethylium [CH3CHOOH]+ (g, trans singlet) 690.7 675.0 ± 1.5 kJ/mol 61.0594 ± *126898-98-4*21 Ethenyldioxy CH2CHOO (g, anti) 118.6 109.1 ± 1.1 kJ/mol 59.0440 ± 88181-72-0*1 Hydroxyformyl anion [HOCO]- (g, trans) -313.64 -315.45 ± 0.56 kJ/mol 45.0180 ± 78944-70-4*1 Ethoxyethene CH2CHOCH2CH3 (g, cis-trans) -117.8 -141.6 ± 1.5 kJ/mol 72.1057 ± 109-92-2*2 1,1-Ethenediol CH2C(OH)2 (g, syn-anti Cs) -307.54 -320.49 ± 0.83 kJ/mol 60.0520 ± 10375-04-9*1 1,2-Ethenediol HOCHCHOH (g, cis) -272.66 -284.99 ± 0.90 kJ/mol 60.0520 ± 1571-60-4*1 (Formyloxy)methyl HC(O)OCH2 (g, syn) -151.3 -159.4 ± 1.1 kJ/mol 59.0440 ± 3122-12-1*1 Ethylene glycol (CH2OH)2 (g) -369.65 -389.28 ± 0.40 kJ/mol 62.0678 ± 107-21-1*0 Oxalic acid (C(O)OH)2 (g) -721.0 -731.7 ± 1.2 kJ/mol 90.0349 ± 144-62-7*0 (Methylamino)methyl cation [CH3NHCH2]+ (g) 729.59 710.98 ± 0.98 kJ/mol 44.0752 ± *31277-24-4*0 (Methyleneamino)methyl anion [CH2NCH2]- (g) 187.0 176.6 ± 1.6 kJ/mol 42.0604 ± 73859-26-4*0 2-Aminoethenyl CHCHNH2 (g, anti) 319.8 309.6 ± 1.3 kJ/mol 42.0599 ± 176964-54-8*2 Trioxidanyl HOOO (g, trans) 25.36 23.37 ± 0.13 kJ/mol 49.00614 ± 12500-78-6*1 Bromotrichloromethane CCl3Br (g) -29.82 -38.97 ± 0.53 kJ/mol 198.2728 ± 75-62-7*0 Dichloromethyl CHCl2 (g) 92.89 90.98 ± 0.88 kJ/mol 83.9240 ± 3474-12-2*0 Chloromethyl CH2Cl (g) 118.46 115.39 ± 0.87 kJ/mol 49.4793 ± 6806-86-6*0 Methyl hypochlorite CH3OCl (g) -53.0 -62.9 ± 1.4 kJ/mol 66.4866 ± 593-78-2*0 1,2-Dichloroethane CH2ClCH2Cl (g) -118.51 -130.45 ± 0.53 kJ/mol 98.9586 ± 107-06-2*0 Chlorofluoromethane CH2FCl (g) -256.45 -263.64 ± 0.85 kJ/mol 68.4777 ± 593-70-4*0 Difluoromethyliumyl [CF2]+ (g) 908.34 908.77 ± 0.77 kJ/mol 50.00696 ± 54250-40-7*0 Fluoromethyliumylidene [CF]+ (g) 1123.47 1126.69 ± 0.37 kJ/mol 31.00855 ± 33412-11-2*0 1,2-Difluoroacetylene FCCF (g) 2.82 5.65 ± 0.63 kJ/mol 62.0182 ± 689-99-6*0 Chloroformyl ClCO (g) -21.92 -20.52 ± 0.49 kJ/mol 63.4628 ± 2602-42-8*0 o-Benzyne anion [C6H4]- (g) 413.81 404.70 ± 0.95 kJ/mol 76.0965 ± 100569-88-8*0 Cycloheptene CH2(CHCHCH2CH2CH2CH2) (g) 28.55 -8.68 ± 0.74 kJ/mol 96.1702 ± 628-92-2*0 Anisole C6H5OCH3 (g) -45.99 -70.83 ± 0.63 kJ/mol 108.1378 ± 100-66-3*0 Benzoylium [C6H5CO]+ (g) 764.1 750.0 ± 1.3 kJ/mol 105.1135 ± 19270-10-1*0 Benzoyl fluoride C6H5C(O)F (g) -287.9 -304.3 ± 1.3 kJ/mol 124.1124 ± 455-32-3*0 Fluorobenzene cation [C6H5F]+ (g) 791.92 776.90 ± 0.39 kJ/mol 96.1018 ± 34468-25-2*0 Nitrosobenzene C6H5NO (g) 216.9 199.9 ± 1.2 kJ/mol 107.1100 ± 586-96-9*0 1-Methylethoxy CH3CH(O)CH3 (g) -25.07 -43.83 ± 0.74 kJ/mol 59.0871 ± 3958-66-5*0 Nitromethyl CH2N(O)O (g) 139.6 130.2 ± 1.1 kJ/mol 60.0321 ± 16787-85-2*0 2-Butanone CH3CH2C(O)CH3 (g) -216.85 -238.30 ± 0.79 kJ/mol 72.1057 ± 78-93-3*0 Acryloyl CH2CHCO (g, 2A', trans) 101.1 95.2 ± 1.4 kJ/mol 55.0553 ± 72241-20-4*11 Dioxaziridinyl N(OO) (g) 355.1 352.6 ± 1.4 kJ/mol 46.00554 ± 66252-29-7*0 Formaldoxime CH2NOH (g, trans) 30.6 20.0 ± 1.3 kJ/mol 45.04066 ± 75-17-2*1 Trioxygen difluoride FOOOF (g, trans) 112.5 106.7 ± 1.1 kJ/mol 85.99501 ± 16829-28-0*1 1,3-Cyclobutadien-1-yl C(CHCHCH) (g) 653.9 649.4 ± 1.1 kJ/mol 51.0666 ± 127611-22-7*0 Hypochloroperoxoous acid, hydroxy ester HOOOCl (g, syn) 48.4 41.5 ± 1.8 kJ/mol 84.4588 ± 928652-99-7*1 5-Methyl-1,3-cyclopentadiene CH3CH(CHCHCHCH) (g) 134.1 111.1 ± 1.4 kJ/mol 80.1277 ± 96-38-8*0 Trifluorosilyl SiF3 (g) -993.0 -996.0 ± 1.3 kJ/mol 85.08071 ± 14835-14-4*0 Silylsilylene SiH3SiH (g, singlet) 317.3 309.5 ± 1.9 kJ/mol 60.20276 ± 50420-90-1*2 Fluorotrimethylsilane SiF(CH3)3 (g) -547.2 -570.8 ± 2.0 kJ/mol 92.1875 ± 420-56-4*0 Chlorotrimethylsilane SiCl(CH3)3 (g) -326.3 -349.5 ± 2.3 kJ/mol 108.6418 ± 75-77-4*0 Trimethylsiloxide [(CH3)3SiO]- (g) -486.6 -510.4 ± 2.1 kJ/mol 89.1890 ± 41866-81-3*0 1,4-Hexadiyne HCCCH2CCCH3 (g) 424.7 414.8 ± 1.2 kJ/mol 78.1118 ± 10420-91-4*0 Biallenyl CH2CCHCHCCH2 (g, trans) 410.6 399.0 ± 1.5 kJ/mol 78.1118 ± 29776-96-3*1 1,2,3,4-Hexatetraene CH2CCCCHCH3 (g) 429.8 420.1 ± 1.5 kJ/mol 78.1118 ± 177856-38-1*0 Pentatetraene CH2CCCCH2 (g) 452.58 448.58 ± 0.93 kJ/mol 64.0853 ± 21986-03-8*0 1-Aminoethyl CH3CHNH2 (g) 133.33 116.55 ± 0.94 kJ/mol 44.0758 ± 30208-36-7*0 Ethylamidogen CH3CH2NH (g) 166.71 150.59 ± 0.95 kJ/mol 44.0758 ± 41084-92-8*0 2-Naphthyl anion [C6H4(CHCCHCH)]- (g) 288.8 269.4 ± 1.2 kJ/mol 127.1631 ± 88760-89-8*0 1-Naphthyl anion [C6H4(CCHCHCH)]- (g) 283.6 264.2 ± 1.2 kJ/mol 127.1631 ± 125254-29-7*0 Nitrosamine NH2NO (g) 85.83 76.95 ± 0.95 kJ/mol 46.02876 ± 35576-91-1*0 Sulfur trioxide anion [OS(O)O]- (g) -603.0 -608.6 ± 2.3 kJ/mol 80.0647 ± 12210-38-7*0 Bromonium [HBrH]+ (g) 924.4 913.6 ± 3.0 kJ/mol 81.9193 ± 36658-54-5*0 Diazenyl NNH (g) 252.16 249.24 ± 0.45 kJ/mol 29.02142 ± 36882-13-0*0 Nitrosyl chloride ClNO (g) 54.461 52.559 ± 0.067 kJ/mol 65.45884 ± 2696-92-6*0 Carbide [C2]- (g) 504.37 510.95 ± 0.31 kJ/mol 24.0219 ± 12595-78-7*0 Carbon dioxide CO2 (g, triplet) 49.8 50.6 ± 1.1 kJ/mol 44.00950 ± 124-38-9*1 Bicyclo[1.1.0]buta-1,3-diene-2,4-diyl C(CC)C (g) 1047.09 1054.69 ± 0.67 kJ/mol 48.0428 ± 12184-80-4*0 Methane cation [CH4]+ (g) 1150.683 1144.300 ± 0.057 kJ/mol 16.04191 ± 20741-88-2*0 Ethanium [C2H7]+ (g) 874.37 858.13 ± 0.61 kJ/mol 31.0764 ± 24669-33-8*0 Acetylene cation [HCCH]+ (g) 1328.88 1328.21 ± 0.12 kJ/mol 26.0367 ± 25641-79-6*0 1-Ethylium-1-ylidene [CH3C]+ (g) 1329.8 1328.3 ± 1.2 kJ/mol 27.0447 ± 78949-84-5*0 Ethylidyne anion [CH3C]- (g) 457.1 453.1 ± 1.2 kJ/mol 27.0458 ± 117768-70-4*0 Hydrogen difluoride (F)(HF) (g, lin) -198.5 -198.4 ± 1.2 kJ/mol 39.004746 ± 12528-21-1*1 Isocyanomethyl CH2NC (g) 363.3 360.8 ± 1.1 kJ/mol 40.0440 ± 70971-59-4*0 Chlorine difluoride FClF (g) -47.0 -48.2 ± 1.3 kJ/mol 73.44951 ± 24801-48-7*0 Methyloxoniumylidene [CH3O]+ (g) 1062.74 1054.93 ± 0.57 kJ/mol 31.03337 ± 58157-09-8*0 Hydroxymethanide [CH2OH]- (g) 10.0 3.4 ± 1.5 kJ/mol 31.03447 ± 55830-71-2*0 Formaldehyde CH2O (g, singlet) -105.382 -109.223 ± 0.094 kJ/mol 30.02598 ± 50-00-0*2 Hydroxymethylene HCOH (g, cis) 131.12 127.37 ± 0.29 kJ/mol 30.02598 ± 19710-56-6*2 Hydroxymethylene cation [HCOH]+ (g, trans) 971.9 968.2 ± 1.4 kJ/mol 30.02543 ± 135395-06-1*1 Isoformyl COH (g) 217.25 217.63 ± 0.69 kJ/mol 29.01804 ± 71080-92-7*0 Hydroxyoxomethoxy HOC(O)O (g) -360.36 -366.44 ± 0.93 kJ/mol 61.0168 ± 38330-85-7*0 3-Dioxiranone OC(OO) (g) -159.9 -162.7 ± 1.5 kJ/mol 60.0089 ± 94660-13-6*0 Carbonylbis(oxy) anion [OC(O)O]- (g) -550.4 -552.4 ± 1.4 kJ/mol 60.0094 ± 16518-46-0*0 Methyl hydrocarbonate C(O)(OH)OCH3 (g, cis-cis) -577.04 -592.59 ± 0.87 kJ/mol 76.0514 ± 7456-87-3*1 1,2,3-Trioxolane O(OCH2CH2O) (g) -5.7 -23.4 ± 1.5 kJ/mol 76.0514 ± 6669-36-9*0 Bromo hypobromite BrOBr (g) 121.1 104.6 ± 1.2 kJ/mol 175.8074 ± 21308-80-5*0 1-Methylethylidene CH3CCH3 (g, triplet) 326.9 313.7 ± 1.2 kJ/mol 42.0797 ± 40852-89-9*1 Dinitrogen pentoxide O2NONO2 (g) 24.32 14.74 ± 0.29 kJ/mol 108.0105 ± 10102-03-1*0 1-Propenyl CH3CHCH (g, trans) 280.25 269.42 ± 0.76 kJ/mol 41.0718 ± 6067-68-1*1 Water anion [(H)(OH)]- (g, vdW ?) 31.3 29.8 ± 3.1 kJ/mol 18.01583 ± 12259-30-2*100 Cyclopropynyl CH(CC) (g) 711.24 715.37 ± 0.71 kJ/mol 37.0400 ± 119178-99-3*0 n-Butyl anion [CH3CH2CH2CH2]- (g) 106.2 81.3 ± 1.3 kJ/mol 57.1148 ± 79431-01-9*0 sec-Butyl anion [CH3CH2CHCH3]- (g) 103.4 78.9 ± 1.3 kJ/mol 57.1148 ± 79431-00-8*0 1,2-Butadienyl anion [CH3CHCCH]- (g) 255.7 246.2 ± 1.1 kJ/mol 53.0830 ± 65114-67-2*0 Bromide Br- (aq) -120.50 ± 0.12 kJ/mol 79.90455 ± 24959-67-9*800 Neopentyl (CH3)3CCH2 (g) 70.0 40.3 ± 1.3 kJ/mol 71.1408 ± 3744-21-6*0 Trioxidanylium [HOOO]+ (g, trans) 1070.7 1064.4 ± 1.4 kJ/mol 49.00559 ± 74241-49-9*1 n-Hexane CH3CH2CH2CH2CH2CH3 (cr,l) -179.85 -198.51 ± 0.32 kJ/mol 86.1754 ± 110-54-3*500 n-Nonane CH3(CH2)7CH3 (g) -176.30 -228.09 ± 0.48 kJ/mol 128.2551 ± 111-84-2*0 1-Hydroxyethylium [CH3CHOH]+ (g, syn) 610.9 596.5 ± 1.1 kJ/mol 45.0600 ± 18682-96-7*2 2-Hydroxyethyl CH2CH2OH (g, gauche-anti) -10.86 -23.50 ± 0.93 kJ/mol 45.0605 ± 4422-54-2*2 Ethoxy CH3CH2O (g) 1.35 -12.08 ± 0.42 kJ/mol 45.0605 ± 2154-50-9*0 Vinyl alcohol cation [CH2CHOH]+ (g, anti) 778.6 767.4 ± 1.3 kJ/mol 44.0520 ± 57239-63-1*2 1-Hydroxyethylidene CH3COH (g, syn singlet) 70.07 59.56 ± 0.86 kJ/mol 44.0526 ± 30967-49-8*22 1-Hydroxyethenyl CH2COH (g) 121.33 114.95 ± 0.83 kJ/mol 43.0446 ± 81847-74-7*0 Oxiranylium [CH2(CHO)]+ (g, singlet) 901.3 893.3 ± 1.4 kJ/mol 43.0441 ± 57789-76-1*2 C=O=C COC (g, triplet) 653.0 657.3 ± 1.5 kJ/mol 40.0208 ± *12071-23-7*1 C=O=C COC (g, singlet) 721.9 726.2 ± 1.6 kJ/mol 40.0208 ± *12071-23-7*2 Oxoethylidene HCC(O)H (g, singlet) 275.4 272.6 ± 1.7 kJ/mol 42.0367 ± 39920-84-8*2 Dihydroxymethanide [CH(OH)2]- (g, syn-syn) -194.2 -203.2 ± 1.8 kJ/mol 47.0339 ± 61192-32-3*2 1-Hydroperoxyethyl CH3CHOOH (g) 39.7 26.1 ± 1.3 kJ/mol 61.0599 ± 126898-98-4*0 Formic acid cation [HC(O)OH]+ (g, syn) 721.94 714.86 ± 0.25 kJ/mol 46.0248 ± 50614-05-6*1 Formyloxidanyl HC(O)O (g, 2B2) -121.96 -125.31 ± 0.55 kJ/mol 45.0174 ± 16499-21-1*2 Bifluoride [(HF)(F)]- (g, singlet) -481.8 -480.6 ± 1.9 kJ/mol 39.005295 ± *18130-74-0*2 1-Methoxyethenol CH2C(OH)OCH3 (g, anti-syn) -284.3 -303.6 ± 1.2 kJ/mol 74.0785 ± 4453-91-2*1 1-Propene-1,2-diol CH3C(OH)CHOH (g, cis) -311.3 -329.7 ± 1.2 kJ/mol 74.0785 ± 7333-03-1*1 1-Propene-1,2-diol CH3C(OH)CHOH (g, trans) -293.1 -309.7 ± 1.3 kJ/mol 74.0785 ± 7333-03-1*2 (Formyloxy)methyl HC(O)OCH2 (g, anti) -135.7 -143.9 ± 1.3 kJ/mol 59.0440 ± 3122-12-1*2 Carboxymethyl CH2C(O)OH (g, anti) -206.0 -215.3 ± 1.2 kJ/mol 59.0440 ± 2887-46-9*2 Dimethylamide [(CH3)2N]- (g) 123.1 104.7 ± 1.4 kJ/mol 44.0763 ± 34285-60-4*0 Ethylideneamidogen CH3CHN (g) 209.7 199.3 ± 1.1 kJ/mol 42.0599 ± 28445-33-2*0 (Methyleneamino)methyl CH2NCH2 (g) 244.2 233.6 ± 1.3 kJ/mol 42.0599 ± 56391-78-7*0 2-Aminoethenyl CHCHNH2 (g, syn) 325.6 315.4 ± 1.3 kJ/mol 42.0599 ± 176964-54-8*1 2-Aziridinyl NH(CHCH2) (g, syn) 360.9 348.8 ± 1.7 kJ/mol 42.0599 ± *23838-09-7*1 Azide [NNN]- (g) 193.63 190.13 ± 0.91 kJ/mol 42.02077 ± 14343-69-2*0 Diazirenide [HC(NN)]- (g, singlet) 454.9 452.2 ± 1.5 kJ/mol 41.03267 ± 130614-84-5*2 1H-Diazirin-3-yl HN(NC) (g, doublet) 618.7 615.8 ± 1.6 kJ/mol 41.03212 ± 324529-57-9*1 1H-Diazirene CH(NHN) (g) 405.1 398.0 ± 1.4 kJ/mol 42.04006 ± 157-23-3*0 Dioxidenium [HOO]+ (g) 1110.87 1107.98 ± 0.11 kJ/mol 33.00619 ± 12207-52-2*0 1,1,2-Trichloroethane CH2ClCHCl2 (g) -135.6 -147.3 ± 1.1 kJ/mol 133.4033 ± 79-00-5*0 1,1,1,2-Tetrachloroethane CH2ClCCl3 (g) -144.4 -152.9 ± 1.3 kJ/mol 167.8481 ± 630-20-6*0 Pentachloroethyl CCl3CCl2 (g) 28.9 27.0 ± 1.3 kJ/mol 201.2849 ± 7094-17-9*0 Iodomethane CH3I (l) -12.21 ± 0.19 kJ/mol 141.93899 ± 74-88-4*590 1H-Triazirin-1-yl N(NN) (g) 586.0 584.2 ± 2.0 kJ/mol 42.02022 ± 912535-95-6*0 Difluoromethylene CF2 (g, triplet) 43.29 44.01 ± 0.35 kJ/mol 50.00751 ± 2154-59-8*1 Ethyl iodide CH3CH2I (l) -9.41 -39.28 ± 0.48 kJ/mol 155.9656 ± 75-03-6*500 Hydrogen fluoride HF (aq) -334.67 ± 0.15 kJ/mol 20.006343 ± 7664-39-3*800 cis-1,2-Difluoroethene CHFCHF (g, cis) -302.98 -309.75 ± 0.83 kJ/mol 64.0341 ± 1630-77-9*0 Fluoroethynyl CCF (g) 445.3 449.8 ± 1.6 kJ/mol 43.0198 ± 22533-50-2*0 Fluoro(fluorooxy)methylene FCOF (g, cis) -134.8 -136.0 ± 1.3 kJ/mol 66.00691 ± 479587-30-9*2 Dibromophosgene CBr2O (g) -97.92 -113.86 ± 0.37 kJ/mol 187.8181 ± 593-95-3*0 1,3,5-Hexatriynyl CCCCCCH (g) 1003.1 1010.5 ± 2.3 kJ/mol 73.0721 ± 88053-50-3*0 Benzene C6H6 (cr,l) 50.77 49.23 ± 0.21 kJ/mol 78.1118 ± 71-43-2*500 o-Benzyne C6H4 (g) 468.19 459.27 ± 0.85 kJ/mol 76.0960 ± 462-80-6*0 m-Benzyne C6H4 (g, singlet) 527.4 518.9 ± 1.2 kJ/mol 76.0960 ± 1828-89-3*2 p-Benzyne C6H4 (g, singlet) 587.0 577.5 ± 1.2 kJ/mol 76.0960 ± 3355-34-8*2 Cycloheptane CH2(CH2CH2CH2CH2CH2CH2) (g) -72.42 -117.91 ± 0.52 kJ/mol 98.1861 ± 291-64-5*0 Hydrogen bromide HBr (aq) -120.50 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*800 1-Oxopropyl CH3CH2CO (g, gauche) -17.35 -29.84 ± 0.93 kJ/mol 57.0712 ± 15843-24-0*2 Propyn-1-ol CH3CCOH (g) 65.6 57.4 ± 1.1 kJ/mol 56.0633 ± 6175-54-8*0 Chloryl hydride HCl(O)O (g) 197.7 191.2 ± 1.6 kJ/mol 68.4594 ± 174365-32-3*0 Formylethynyl CCCHO (g) 468.5 470.4 ± 1.3 kJ/mol 53.0394 ± 277743-00-7*0 2-Cyclopropen-1-one OC(CHCH) (g) 164.0 160.0 ± 1.1 kJ/mol 54.0474 ± 2961-80-0*0 Formamide enol NHCHOH (g, anti-syn) -130.6 -141.7 ± 1.3 kJ/mol 45.04066 ± 60100-09-6*1 Cyanovinylidene CCHCN (g) 581.8 584.3 ± 1.2 kJ/mol 51.0468 ± 70277-81-5*0 Isocyanovinylidene CCHNC (g) 697.1 700.4 ± 1.4 kJ/mol 51.0468 ± 737788-76-0*0 Isocyanoethene CH2CHNC (g, singlet) 285.29 278.79 ± 0.92 kJ/mol 53.0627 ± 14668-82-7*1 1-Cyanoethylidene CH3CCN (g, triplet) 437.6 433.8 ± 1.4 kJ/mol 53.0627 ± 498544-34-6*1 Isocyanomethylene HCNC (g, singlet) 583.1 584.4 ± 1.6 kJ/mol 39.0361 ± 78694-65-2*1 2-Methyl-2-cyclopropen-1-ylidene CH3C(CHC) (g, singlet) 448.1 441.9 ± 1.2 kJ/mol 52.0746 ± 185841-59-2*2 1,2,3-Butatrien-1-ylium [CH2CCCH]+ (g, triplet) 1425.9 1426.2 ± 1.3 kJ/mol 51.0661 ± 81932-79-8*1 But-1-en-3-yn-1-ide [HCCCHCH]- (g, cis) 419.8 418.7 ± 1.2 kJ/mol 51.0672 ± 119611-65-3*2 But-3-en-1-yn-1-ide [CH2CHCC]- (g, singlet) 326.8 323.7 ± 1.3 kJ/mol 51.0672 ± 58870-47-6*2 Cyclobutenyl CH2(CHCHCH) (g) 337.3 324.8 ± 1.2 kJ/mol 53.0825 ± 24669-29-2*0 Propargyl chloride HCCCH2Cl (g) 186.7 180.8 ± 1.3 kJ/mol 74.5086 ± 624-65-7*0 Dioxosilane SiO2 (g) -277.9 -279.3 ± 2.0 kJ/mol 60.08430 ± 7631-86-9*0 Iodide I- (aq) -56.825 ± 0.090 kJ/mol 126.905019 ± 20461-54-5*800 Dimethylsilane CH3SiH2CH3 (g) -66.8 -88.2 ± 1.1 kJ/mol 60.1704 ± 1111-74-6*0 Trimethylsilyl Si(CH3)3 (g) 47.5 25.4 ± 1.9 kJ/mol 73.1891 ± 16571-41-8*0 Benzvalene ((CHCH)(CH(CHCH)CH)) (g) 404.4 386.7 ± 1.2 kJ/mol 78.1118 ± 659-85-8*0 1-Ethynyl-2-propyn-1-ylidene HCCCCCH (g, triplet) 727.0 734.1 ± 1.7 kJ/mol 62.0694 ± 882068-94-2*1 1,2-Pentadien-4-yne HCCCHCCH2 (g) 442.28 436.65 ± 0.97 kJ/mol 64.0853 ± 33555-85-0*0 2,4-Pentadiynyl HCCCCCH2 (g) 568.80 568.04 ± 0.98 kJ/mol 63.0773 ± 115236-82-3*0 2-Naphthalenyl C6H4(CHCCHCH) (g) 416.9 397.3 ± 1.3 kJ/mol 127.1626 ± 10237-50-0*0 1-Naphthalenyl C6H4(CCHCHCH) (g) 418.2 398.6 ± 1.3 kJ/mol 127.1626 ± 2510-51-2*0 Aniline C6H5NH2 (g) 108.82 86.81 ± 0.72 kJ/mol 93.1265 ± 62-53-3*0 Thiodioxy SOO (g) 199.2 197.1 ± 1.3 kJ/mol 64.0648 ± 164034-62-2*0 Sulfenic acid HSOH (g) -108.0 -114.2 ± 1.1 kJ/mol 50.0813 ± 62607-44-7*0 3,3-Dioxidedioxathiirane OS(OO)O (g, singlet C2v) -257.1 -265.2 ± 1.4 kJ/mol 96.0636 ± 1177730-84-5*2 Sulfate [OS(O)(O)O]-2 (g) -599.7 -608.4 ± 1.8 kJ/mol 96.0647 ± 14808-79-8*0 Peroxynitrous acid HOONO (g, cis, perp) -0.12 -7.17 ± 0.53 kJ/mol 63.01288 ± 14691-52-2*2 Difluoroaminylium [NF2]+ (g, singlet) 1157.81 1154.93 ± 0.71 kJ/mol 52.002998 ± 31685-31-1*2 (Z)-Difluorodiazene FNNF (g, cis) 78.5 72.9 ± 2.1 kJ/mol 66.01029 ± 13812-43-6*2 (E)-Difluorodiazene FNNF (g, trans) 84.2 78.9 ± 2.3 kJ/mol 66.01029 ± 13776-62-0*1 Oxygen cation monohydrate [(HOH)O]+ (g) 1153.4 1147.9 ± 3.3 kJ/mol 34.01413 ± *31748-17-1*0 Dioxiranylidene C(OO) (g) 190.3 191.1 ± 1.4 kJ/mol 44.00950 ± 138832-57-2*0 Fluorohydrochlorine cation [FClH]+ (g) 975.3 972.3 ± 2.0 kJ/mol 55.45849 ± 70110-64-4*0 Nitrosodioxaziridine ONN(OO) (g, trans) 413.6 407.6 ± 1.8 kJ/mol 76.01168 ± 132871-99-9*1 Dihydrogen fluoride anion [HFH]- (g, triplet) 133.2 131.9 ± 1.6 kJ/mol 21.01483 ± 117339-92-1*1 Oxywater (H2O)O (g) 64.9 58.4 ± 1.3 kJ/mol 34.01468 ± 171363-09-0*0 Methylammonium [CH3NH3]+ (g) 628.37 609.46 ± 0.97 kJ/mol 32.06453 ± 17000-00-9*0 Aminomethylene CHNH2 (g) 245.9 238.1 ± 1.5 kJ/mol 29.04126 ± 35430-17-2*0 Methyleneamidogen anion [CH2N]- (g) 192.84 189.08 ± 0.88 kJ/mol 28.03387 ± 28892-56-0*0 (Z)-Iminomethyl HCNH (g, cis) 294.52 291.03 ± 0.89 kJ/mol 28.03332 ± 54980-11-9*0 Aminomethylidyne CNH2 (g) 371.9 368.4 ± 1.1 kJ/mol 28.03332 ± 84654-89-7*0 Ethynylamidogen HCCNH (g) 395.29 393.27 ± 0.96 kJ/mol 40.0440 ± 73456-14-1*0 Trioxidaniumyl [HOOOH]+ (g, t, t) 925.5 916.3 ± 1.4 kJ/mol 50.01353 ± 161321-37-5*2 Methyleneoxonium CH2OH2 (g) 152.53 144.21 ± 0.49 kJ/mol 32.04186 ± 177788-17-9*0 Hydroxymethylene anion [HCOH]- (g, trans) 147.1 144.1 ± 1.6 kJ/mol 30.02653 ± 207914-87-2*1 Chlorine difluoride cation [FClF]+ (g) 998.8 996.6 ± 1.7 kJ/mol 73.44896 ± 32629-46-2*0 Hydroxymethyliumylidene [COH]+ (g) 986.01 987.65 ± 0.83 kJ/mol 29.01749 ± 60528-75-8*0 Isoformyl anion [(CO)(H)]- (g, vdW singlet ?) 55.7 58.4 ± 1.8 kJ/mol 29.01859 ± 81747-63-9*1 Carbonic acid C(O)(OH)2 (g) -602.29 -611.60 ± 0.55 kJ/mol 62.0248 ± 463-79-6*0 Peroxyformic acid HC(O)OOH (g, trans) -265.2 -273.2 ± 1.5 kJ/mol 62.0248 ± 107-32-4*2 Chlorine fluoride cation [ClF]+ (g) 1165.52 1165.70 ± 0.49 kJ/mol 54.45055 ± 12432-44-9*0 1,3-Propanediyl CH2CH2CH2 (g, triplet Cs) 319.3 307.1 ± 1.3 kJ/mol 42.0797 ± 32458-33-6*11 Propan-1-yl-3-ylidene CH2CH2CH (g, quartet) 554.4 545.7 ± 1.3 kJ/mol 41.0718 ± *50457-59-5*2 1-Propenylidene CH3CHC (g, singlet) 392.5 388.1 ± 1.1 kJ/mol 40.0639 ± 70277-78-0*1 Cycloprop-2-enyl CH(CHCH) (g) 490.32 485.77 ± 0.57 kJ/mol 39.0559 ± 28933-84-8*0 2-Propen-1-yl-3-ylidene CH2CHC (g) 556.65 554.39 ± 0.89 kJ/mol 39.0559 ± 202744-74-9*0 2-Propynylidyne anion [CCCH]- (g) 540.77 545.54 ± 0.75 kJ/mol 37.0406 ± 82893-67-2*0 t-Butylium [(CH3)3C]+ (g) 733.94 710.67 ± 0.98 kJ/mol 57.1137 ± 14804-25-2*0 1,2-Butadienylium [CH3CHCCH]+ (g, singlet) 1099.2 1089.9 ± 1.2 kJ/mol 53.0820 ± *65114-67-2*2 Hydrogen difluoride cation [FFH]+ (g) 1174.3 1171.3 ± 1.5 kJ/mol 39.004198 ± *126950-54-7*0 (E)-Diazene cation [HNNH]+ (g, trans) 1132.53 1125.59 ± 0.64 kJ/mol 30.02881 ± 59952-06-6*0 2-Hydroxy-1,1-dimethylethyl (CH3)2CCH2OH (g) -71.6 -96.5 ± 1.4 kJ/mol 73.1137 ± 5723-75-1*0 Vinylcyclopentadienyl CH2CHC(CHCHCHCH) (g) 314.9 296.9 ± 1.7 kJ/mol 91.1305 ± 1201826-88-1*0 Chlorine chlorite ClOClO (g, gauche) 168.6 166.2 ± 1.3 kJ/mol 102.9042 ± 105206-44-8*3 (Z)-Diazene HNNH (g, cis) 228.80 221.67 ± 0.59 kJ/mol 30.02936 ± 15626-42-3*0 2,2-Dimethylbutane CH3CH2C(CH3)3 (g) -145.30 -185.72 ± 0.75 kJ/mol 86.1754 ± 75-83-2*0 n-Decane CH3(CH2)8CH3 (g) -192.32 -249.07 ± 0.75 kJ/mol 142.2817 ± 124-18-5*0 Ethanol CH3CH2OH (cr,l) -269.63 -277.39 ± 0.20 kJ/mol 46.0684 ± 64-17-5*500 Vinyl alcohol cation [CH2CHOH]+ (g, syn) 786.65 775.43 ± 0.80 kJ/mol 44.0520 ± 57239-63-1*1 Vinoxy cation [CH2CHO]+ (g, triplet) 1020.2 1013.2 ± 1.5 kJ/mol 43.0441 ± *35731-40-9*1 Vinoxide [CH2CHO]- (g) -152.99 -160.04 ± 0.56 kJ/mol 43.0452 ± 35731-40-9*0 1-Hydroxyethenylium [CH2COH]+ (g, singlet) 841.7 834.9 ± 1.4 kJ/mol 43.0441 ± 41084-89-3*2 Oxiranyl anion [CH2(CHO)]- (g, singlet) 121.3 113.3 ± 1.5 kJ/mol 43.0452 ± 72722-59-9*2 COC vdW (CO)(C) (g, triplet) 589.7 598.4 ± 1.5 kJ/mol 40.0208 ± *12071-24-8*1 Oxirene O(CHCH) (g, c-triplet) 389.7 385.6 ± 1.4 kJ/mol 42.0367 ± 157-18-6*12 Oxygen anion monohydrate [(HOH)O]- (g) -239.0 -244.2 ± 3.0 kJ/mol 34.01523 ± 31748-17-1*0 Methanediol CH2(OH)2 (g, Cs gauche) -368.87 -381.81 ± 0.73 kJ/mol 48.0413 ± 463-57-0*2 Hydroxymethoxy anion [CH2(OH)O]- (g, syn) -373.82 -383.76 ± 0.85 kJ/mol 47.0339 ± 67899-36-9*2 Ethoxyoxoniumylidene [CH3CH2OO]+ (g, triplet) 923.9 911.6 ± 1.5 kJ/mol 61.0594 ± 268728-77-4*1 Ethaneperoxolate [CH3CH2OO]- (g, gauche) -120.36 -136.98 ± 0.70 kJ/mol 61.0604 ± 268728-75-2*3 Formyloxoniumylidene [HC(O)O]+ (g) 1017.4 1014.0 ± 1.4 kJ/mol 45.0169 ± 54375-27-8*0 Dioxymethylene HCOO (g, trans) 364.0 361.7 ± 2.4 kJ/mol 45.0174 ± 438586-67-5*1 Cyanate [NCO]- (g) -221.16 -221.38 ± 0.53 kJ/mol 42.01739 ± 661-20-1*0 Oxazirinyl C(NO) (g) 450.1 450.9 ± 1.5 kJ/mol 42.01684 ± 228850-18-8*0 2-Propene-1,2-diol CH2C(OH)CH2OH (g, anti-gauche-gauche) -295.3 -314.9 ± 1.2 kJ/mol 74.0785 ± 44169-27-9*11 2-Methoxy-2-oxoethyl CH2C(O)OCH3 (g, syn) -202.9 -218.1 ± 1.5 kJ/mol 73.0706 ± 54668-31-4*1 (Acetyloxy)methyl CH3C(O)OCH2 (g, syn) -200.1 -213.9 ± 1.5 kJ/mol 73.0706 ± 2887-49-2*1 Glyoxal OCHCHO (g) -207.84 -213.40 ± 0.55 kJ/mol 58.0361 ± 107-22-2*0 Hydroxyaminiumyl [NOH]+ (g) 1161.1 1158.2 ± 1.4 kJ/mol 31.01353 ± 63559-88-6*0 Bifluoride [FFH]- (g, triplet) -68.0 -67.6 ± 1.6 kJ/mol 39.005295 ± *18130-74-0*1 Dimethylmethyleneammonium [(CH3)2NCH2]+ (g) 697.1 672.0 ± 1.3 kJ/mol 58.1018 ± 28149-27-1*0 Chlorosyl hydride HClO (g) 141.9 139.0 ± 1.7 kJ/mol 52.46004 ± 71572-35-5*0 2-Methanidylidynehydrazin-2-ium-1-ide [HNNC]- (g, singlet) 281.8 279.1 ± 1.4 kJ/mol 41.03267 ± *947408-74-4*2 2-Methanidylidynehydrazin-2-ium-1-ide [HNNC]- (g, c-triplet) 518.6 516.1 ± 1.6 kJ/mol 41.03267 ± *947408-74-4*12 Isocyanamide NH2NC (g) 328.5 322.6 ± 1.5 kJ/mol 42.04006 ± 4702-38-9*0 Hydroxyamidogen HNOH (g, cis) 123.3 116.7 ± 1.7 kJ/mol 32.02202 ± 13940-32-4*2 Trichloromethide [CCl3]- (g) -123.2 -122.7 ± 2.0 kJ/mol 118.3693 ± 14478-07-0*0 Aquachlorine cation [ClOH2]+ (g) 821.9 815.1 ± 1.8 kJ/mol 53.46743 ± 142599-65-3*0 Hydroxyaminylium [HNOH]+ (g, trans) 1019.5 1012.3 ± 2.5 kJ/mol 32.02147 ± 66097-71-0*1 1,1,2,2-Tetrachloroethane CHCl2CHCl2 (g) -146.7 -156.1 ± 1.5 kJ/mol 167.8481 ± 79-34-5*0 1,1,2,2-Tetrachloroethane CHCl2CHCl2 (cr,l) -172.9 -201.8 ± 1.5 kJ/mol 167.8481 ± 79-34-5*500 Pentachloroethane CHCl2CCl3 (cr,l) -201.9 ± 2.5 kJ/mol 202.2928 ± 76-01-7*500 Trichloroethene CHClCCl2 (l) -48.8 ± 1.5 kJ/mol 131.3874 ± 79-01-6*590 Tetrachloroethene CCl2CCl2 (l) -61.15 ± 0.99 kJ/mol 165.8322 ± 127-18-4*500 Trichloroethene CHClCCl2 (g) -10.9 -14.2 ± 1.5 kJ/mol 131.3874 ± 79-01-6*0 Oxofluoronium [FO]+ (g) 1342.66 1342.61 ± 0.80 kJ/mol 34.99725 ± 12763-67-6*0 Bromodichloromethane CHCl2Br (g) -34.8 -46.5 ± 1.2 kJ/mol 163.8280 ± 75-27-4*0 Difluorodibromomethane CF2Br2 (g) -359.8 -377.8 ± 1.3 kJ/mol 209.8155 ± 75-61-6*0 Dichlorodibromomethane CCl2Br2 (g) 28.3 12.4 ± 1.2 kJ/mol 242.7241 ± 594-18-3*0 Difluorobromomethane CHF2Br (g) -411.40 -424.60 ± 0.47 kJ/mol 130.9194 ± 1511-62-2*0 1,2-Difluoroethane CH2FCH2F (g) -434.41 -447.83 ± 0.80 kJ/mol 66.0500 ± 624-72-6*0 Vinyl iodide CH2CHI (g) 139.82 130.98 ± 0.97 kJ/mol 153.9497 ± 593-66-8*0 Fluoro(fluorooxy)methylene FCOF (g, trans) -37.5 -39.1 ± 1.4 kJ/mol 66.00691 ± 479587-30-9*1 Benzenium [CH2(CHCHCHCHCH)]+ (g) 887.7 867.7 ± 1.1 kJ/mol 79.1192 ± 26812-57-7*0 Phenylium [C6H5]+ (g, triplet) 1251.3 1238.2 ± 1.6 kJ/mol 77.1034 ± 17333-73-2*1 2-Hydrotrioxy anion [OO(H)O]- (g) 27.4 21.6 ± 1.4 kJ/mol 49.00669 ± *89965-38-8*0 Benzylium [C6H5CH2]+ (g) 929.56 910.06 ± 0.51 kJ/mol 91.1299 ± 6711-19-9*0 Benzylidene C6H5CH (g, triplet) 473.0 457.7 ± 1.3 kJ/mol 90.1225 ± 3101-08-4*1 Cycloheptatetraene C(CHCHCHCHCHCH) (g, singlet) 418.7 403.1 ± 1.3 kJ/mol 90.1225 ± 52783-93-4*2 2,5-Norbornadien-7-yl (CHCH)(CHCHCH)(CHCH) (g) 480.2 459.2 ± 1.7 kJ/mol 91.1305 ± 35430-15-0*0 Pentalene CH(CHC(CHCHCH)CCH) (g) 389.9 373.6 ± 1.4 kJ/mol 102.1332 ± 250-25-9*0 Indenyl C6H4(CHCHCH) (g) 299.2 279.2 ± 1.6 kJ/mol 115.1519 ± 71551-80-9*0 Benzoyl chloride C6H5C(O)Cl (cr,l) -157.11 ± 0.26 kJ/mol 140.5667 ± 98-88-4*500 Benzoyl chloride C6H5C(O)Cl (g) -89.5 -104.8 ± 1.2 kJ/mol 140.5667 ± 98-88-4*0 Dioxosilane SiO2 (cr, quartz) -906.77 -911.75 ± 0.63 kJ/mol 60.08430 ± 7631-86-9*505 Hexafluorobenzene C6F6 (g) -942.57 -947.57 ± 0.87 kJ/mol 186.0546 ± 392-56-3*0 Chlorobenzene cation [C6H5Cl]+ (g) 942.59 928.66 ± 0.61 kJ/mol 112.5561 ± 55450-32-3*0 Chlorobenzene C6H5Cl (cr,l) 11.34 ± 0.59 kJ/mol 112.5566 ± 108-90-7*500 m-Chlorophenyl C6H4Cl (g) 321.7 311.0 ± 1.6 kJ/mol 111.5487 ± 3474-40-6*0 p-Chlorophenyl C6H4Cl (g) 324.6 313.8 ± 1.6 kJ/mol 111.5487 ± 2396-00-1*0 o-Chlorophenyl C6H4Cl (g) 328.9 318.2 ± 1.6 kJ/mol 111.5487 ± 3474-42-8*0 Bromobenzene cation [C6H5Br]+ (g) 995.1 973.6 ± 1.3 kJ/mol 157.0074 ± 55450-33-4*0 Iodobenzene C6H5I (cr,l) 113.7 113.8 ± 1.1 kJ/mol 204.0084 ± 591-50-4*500 Nitrobenzene C6H5N(O)O (g) 82.3 62.3 ± 1.3 kJ/mol 123.1094 ± 98-95-3*0 3-Methylenecyclopropene cation [CH2C(CHCH)]+ (g) 1181.8 1174.7 ± 1.2 kJ/mol 52.0740 ± 79105-72-9*0 1-Hydroxy-1-methylethyl cation [CH3C(OH)CH3]+ (g) 521.4 501.0 ± 1.2 kJ/mol 59.0865 ± *5131-95-3*0 1-Hydroxypropyl CH3CH2CHOH (g) -55.3 -73.1 ± 1.1 kJ/mol 59.0871 ± 5723-77-3*0 1-Oxopropyl CH3CH2CO (g, eclips) -19.1 -31.9 ± 1.1 kJ/mol 57.0712 ± 15843-24-0*1 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-trans, syn) -53.3 -70.3 ± 1.5 kJ/mol 70.0898 ± 59120-04-6*11 Cyclopropanone OC(CH2CH2) (g) 30.63 19.21 ± 0.96 kJ/mol 56.0633 ± 5009-27-8*0 2-Formylethen-1-ide [CHCHCHO]- (g, anti-trans) 27.3 20.6 ± 2.5 kJ/mol 55.0559 ± 135924-69-5*11 Dioxyamidogen HNOO (g, cis) 240.5 233.8 ± 1.8 kJ/mol 47.01348 ± 71843-95-3*2 Ethenedione OCCO (g) 14.5 17.0 ± 1.2 kJ/mol 56.0202 ± 4363-38-6*0 Formylamidogen CH(O)NH (g) 76.5 71.1 ± 1.1 kJ/mol 44.03272 ± 14753-22-1*0 Deuterium atom D (g) 219.804 221.717 ± 0.000 kJ/mol 2.01410177800 ± 16873-17-9*0 Formaldonitrone CH2NHO (g) 78.4 67.1 ± 1.4 kJ/mol 45.04066 ± 67353-84-8*0 2-Cyclopropen-1-imine (CHCH)CNH (g) 401.9 394.2 ± 1.4 kJ/mol 53.0627 ± 31589-17-0*0 1-Isocyanovinyl CH2CNC (g) 519.1 517.3 ± 1.4 kJ/mol 52.0547 ± 321850-14-0*0 Vinylvinylidene CH2CHCHC (g, singlet) 494.2 488.8 ± 1.7 kJ/mol 52.0746 ± 148759-16-4*2 But-1-en-3-yn-1-ide [HCCCHCH]- (g, trans) 422.5 421.1 ± 1.3 kJ/mol 51.0672 ± 119611-65-3*1 Tetrahedryl anion [C(CH(CHCH))]- (g) 634.5 630.7 ± 1.6 kJ/mol 51.0672 ± 138805-00-2*0 Silicon carbide SiC (g) 739.3 744.2 ± 2.3 kJ/mol 40.09620 ± 409-21-2*0 Silicon carbide SiC (cr, alpha-hex) -70.6 -71.6 ± 1.5 kJ/mol 40.09620 ± 409-21-2*501 Trifluorosilylium [SiF3]+ (g) -111.6 -114.4 ± 1.8 kJ/mol 85.08016 ± 38192-99-3*0 Fluoride F- (aq) -334.67 ± 0.15 kJ/mol 18.99895178 ± 16984-48-8*800 Silanide [SiH3]- (g) 69.3 63.7 ± 1.3 kJ/mol 31.10987 ± 15807-96-2*0 Dimethylsilanone CH3Si(O)CH3 (g) -237.5 -252.9 ± 2.3 kJ/mol 74.1539 ± 47956-45-6*0 Ethylsilane CH3CH2SiH3 (g) -12.8 -35.3 ± 1.8 kJ/mol 60.1704 ± 2814-79-1*0 Peroxychlorous acid HOOClO (g, syn) 95.4 89.4 ± 2.0 kJ/mol 84.4588 ± 177778-92-6*1 Hydroxysilyl anion [SiH2OH]- (g, syn) -219.2 -227.2 ± 2.1 kJ/mol 47.10927 ± 78450-47-2*1 Triprismane ((CHCH)((CHCH)(CHCH))) (g) 576.0 556.7 ± 1.3 kJ/mol 78.1118 ± 650-42-0*0 Triiodide [I3]- (aq) -51.53 ± 0.79 kJ/mol 380.713959 ± 14900-04-0*800 Propargylallene CH2CCHCH2CCH (g, gauche) 431.4 419.8 ± 1.4 kJ/mol 78.1118 ± 33142-15-3*3 1,4-Pentadiyne HCCCH2CCH (g) 460.2 454.6 ± 1.1 kJ/mol 64.0853 ± 24442-69-1*0 Biphenyl C6H5C6H5 (g) 206.9 178.8 ± 1.1 kJ/mol 154.2078 ± 92-52-4*0 Diacetylide [CCCCH]- (g) 460.94 465.98 ± 0.96 kJ/mol 49.0513 ± 59012-21-4*0 2-Hydrotrioxy cation [OO(H)O]+ (g) 1298.4 1291.8 ± 1.4 kJ/mol 49.00559 ± *74241-49-9*0 Perchloric acid HOCl(O)(O)O (g) 11.7 0.2 ± 1.3 kJ/mol 100.4582 ± 7601-90-3*0 Sulfinyl hydride H2SO (g) -40.7 -47.6 ± 1.2 kJ/mol 50.0813 ± 25540-60-7*0 Peroxychlorite [OClOO]- (g, singlet) -34.5 -33.1 ± 1.8 kJ/mol 83.4514 ± 852472-63-0*2 Sulfuric acid OS(O)(OH)2 (aq, 45 H2O) -886.52 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*906 Bisulfite cation [OS(OH)O]+ (g) 554.0 545.3 ± 1.3 kJ/mol 81.0716 ± 43637-78-1*0 Sulfur tetraoxide OS(O)(O)O (g, triplet D2d) -228.2 -235.1 ± 2.0 kJ/mol 96.0636 ± 12772-98-4*11 Thioformaldehyde CH2S (g, singlet) 121.3 117.6 ± 2.0 kJ/mol 46.0926 ± 865-36-1*2 Dimethylsulfoxide CH3S(O)CH3 (g) -131.92 -150.57 ± 0.57 kJ/mol 78.1344 ± 67-68-5*0 Carbon disulfide SCS (g) 115.88 116.68 ± 0.68 kJ/mol 76.1427 ± 75-15-0*0 Hydrogen atom H (ad, 1 Pt(111) atop) -18.9 -21.4 ± 4.3 kJ/mol 1.007940 ± 12385-13-6*1002001 Hydrogen atom H (ad, 4 Pt(111) atop) -30.3 -32.7 ± 5.3 kJ/mol 1.007940 ± 12385-13-6*1002004 Vinylidene CCH2 (g, triplet) 610.62 610.33 ± 0.39 kJ/mol 26.0373 ± 2143-69-3*1 Hydrogen chloride HCl (aq) -166.990 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*800 Chlorosyl chloride ClClO (g) 134.5 133.2 ± 1.4 kJ/mol 86.9048 ± 86825-56-1*0 Iminomethide [HCNH]- (g, trans) 237.3 233.5 ± 1.8 kJ/mol 28.03387 ± 90623-30-6*1 Dioxygen O2 (g, singlet) 94.410 94.383 ± 0.000 kJ/mol 31.99880 ± 7782-44-7*2 Dibromide [Br2]- (g) -197.0 -211.1 ± 2.3 kJ/mol 159.8085 ± 12595-70-9*0 Hydrogen difluoride (F)(HF) (g, perp) -187.4 -187.1 ± 1.6 kJ/mol 39.004746 ± 12528-21-1*2 Chlorohydrofluorine cation [ClFH]+ (g) 1000.8 998.1 ± 2.1 kJ/mol 55.45849 ± 70110-63-3*0 Cyanogen iodide anion [ICN]- (g) 86.5 88.8 ± 8.1 kJ/mol 152.92246 ± 1356929-44-6*0 Methanol CH3OH (cr,l) -235.16 -238.50 ± 0.14 kJ/mol 32.04186 ± 67-56-1*500 Formaldehyde cation [CH2O]+ (g) 944.859 941.238 ± 0.096 kJ/mol 30.02543 ± 54288-05-0*0 Isoformyl anion [COH]- (g, triplet) 267.4 268.0 ± 1.6 kJ/mol 29.01859 ± 81747-63-9*2 1,3-Propanediyl CH2CH2CH2 (g, singlet Cs TS) 358.7 343.7 ± 1.4 kJ/mol 42.0797 ± 32458-33-6*22 Trifluoromethide [CF3]- (g) -637.8 -639.6 ± 1.8 kJ/mol 69.00646 ± 54128-17-5*0 1-Chloro ozone ClOOO (g, cis vdW) 226.4 223.1 ± 2.3 kJ/mol 83.4509 ± 141801-66-3*101 Hydrogen fluoride HF (aq, 10 H2O) -321.69 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*815 Allene cation [CH2CCH2]+ (g) 1132.26 1125.11 ± 0.22 kJ/mol 40.0633 ± 65812-77-3*0 2-Propenylidene CHCHCH2 (g, triplet anti) 417.5 410.0 ± 1.5 kJ/mol 40.0639 ± 19527-08-3*11 2-Propenylidene CHCHCH2 (g, singlet) 452.73 445.60 ± 0.90 kJ/mol 40.0639 ± 19527-08-3*2 Cycloprop-1-enylide [CH2(CHC)]- (g) 373.7 369.2 ± 1.7 kJ/mol 39.0565 ± 80251-77-0*0 2-Cyclopropen-1-ylium-1-yl [C(CHCH)]+ (g) 1381.8 1380.8 ± 1.1 kJ/mol 38.0474 ± 85398-75-0*0 Propynylidene HCCCH (g, cis singlet) 597.8 599.6 ± 1.2 kJ/mol 38.0480 ± 67152-18-5*3 Propenediylidene CHCHC (g) 796.3 797.5 ± 1.4 kJ/mol 38.0480 ± 60731-11-5*0 n-Butylium [CH3CH2CH2CH2]+ (g) 827.7 803.3 ± 1.1 kJ/mol 57.1137 ± 25453-90-1*0 2-Butynylium [CH3CCCH2]+ (g, singlet) 1085.9 1077.6 ± 1.3 kJ/mol 53.0820 ± 64235-83-2*2 1-Methylene-2-propenyl anion [CH2CHCCH2]- (g) 256.4 246.5 ± 1.3 kJ/mol 53.0830 ± 64480-63-3*0 1,3-Butadienyl anion [CH2CHCHCH]- (g) 265.4 255.0 ± 1.5 kJ/mol 53.0830 ± 65114-68-3*0 Dihydrogen fluoride anion [(F)(HH)]- (g, singlet) -257.0 -260.1 ± 1.9 kJ/mol 21.01483 ± *117339-92-1*2 Ethyloxoniumyl [CH3CH2OH]+ (g) 783.3 766.4 ± 1.7 kJ/mol 46.0679 ± 34480-55-2*0 Dihydrogen cation [H2]+ (g) 1488.364 1488.480 ± 0.000 kJ/mol 2.01533 ± 12184-90-6*0 1-Hydroxyethyl CH3CHOH (g, gauche-syn) -41.36 -54.83 ± 0.91 kJ/mol 45.0605 ± 2348-46-1*2 1-Hydroxyethylium [CH3CHOH]+ (g) 608.87 594.44 ± 0.38 kJ/mol 45.0600 ± 18682-96-7*0 2-Hydroxyethylium [CH2CH2OH]+ (g, staggered-anti) 1019.3 1006.5 ± 1.5 kJ/mol 45.0600 ± 38607-31-7*3 Ethyloxoniumylidene [CH3CH2O]+ (g) 988.7 975.0 ± 1.5 kJ/mol 45.0600 ± 54387-07-4*0 Diiodide [I2]- (g) -178.13 -180.72 ± 0.48 kJ/mol 253.809489 ± 12190-71-5*0 Acetaldehyde cation [CH3CHO]+ (g) 832.11 822.13 ± 0.22 kJ/mol 44.0520 ± 36505-03-0*0 1-Hydroxyethylidene CH3COH (g, gauche triplet) 185.0 175.5 ± 1.4 kJ/mol 44.0526 ± 30967-49-8*1 Methoxymethylene CH3OCH (g, gauche triplet) 245.4 235.9 ± 1.4 kJ/mol 44.0526 ± 19527-10-7*1 Oxiranylium [CH2(CHO)]+ (g, triplet) 1233.6 1226.6 ± 1.6 kJ/mol 43.0441 ± 57789-76-1*1 Oxiranyl anion [CH2(CHO)]- (g, triplet) 141.0 135.0 ± 1.6 kJ/mol 43.0452 ± 72722-59-9*1 Acetic acid CH3C(O)OH (aq) -485.10 ± 0.27 kJ/mol 60.0520 ± 64-19-7*800 Ketenyl anion [HCCO]- (g) -48.44 -47.51 ± 0.82 kJ/mol 41.0293 ± 64066-01-9*0 Dicarbon monoxide anion [CCO]- (g) 154.17 157.81 ± 0.83 kJ/mol 40.0213 ± 87191-88-6*0 Dicarbon monoxide CCO (g, singlet) 440.21 444.54 ± 0.83 kJ/mol 40.0208 ± 12071-23-7*2 COC vdW (CO)(C) (g, singlet) 726.2 734.6 ± 1.7 kJ/mol 40.0208 ± *12071-24-8*2 C=O-C cation [COC]+ (g, doublet) 1585.8 1592.9 ± 2.7 kJ/mol 40.0203 ± 83483-98-1*1 C=O=C anion [COC]- (g) 550.3 554.0 ± 1.7 kJ/mol 40.0213 ± *87191-88-6*0 Oxirene cation [O(CHCH)]+ (g) 1106.2 1102.4 ± 1.8 kJ/mol 42.0361 ± 94664-69-4*0 Ethynol HCCOH (g) 95.30 92.81 ± 0.73 kJ/mol 42.0367 ± 32038-79-2*0 Ethynol HCCOH (g, gauche triplet) 400.0 397.5 ± 1.9 kJ/mol 42.0367 ± 32038-79-2*11 Azanylium [NH2]+ (g) 1266.56 1264.49 ± 0.11 kJ/mol 16.02207 ± 15194-15-7*0 Oxoethylidene HCC(O)H (g, anti-triplet) 265.9 262.6 ± 1.6 kJ/mol 42.0367 ± 39920-84-8*11 Diazenide [NNH]- (g, vdW) 175.6 176.7 ± 1.6 kJ/mol 29.02197 ± 71004-29-0*100 Hydrogen fluoride HF (aq, 20 H2O) -321.83 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*818 1-Hydroperoxyethylium [CH3CHOOH]+ (g, trans triplet) 841.5 829.5 ± 1.7 kJ/mol 61.0594 ± *126898-98-4*11 Formic acid cation [HC(O)OH]+ (g, anti) 723.8 716.7 ± 1.2 kJ/mol 46.0248 ± 50614-05-6*2 Formic acid anion [HC(O)OH]- (g, syn) -256.2 -262.3 ± 1.8 kJ/mol 46.0259 ± 19066-82-1*1 2-Ethylidenedioxidan-2-ium-1-ide CH3CHOO (g, anti) 65.5 52.8 ± 1.1 kJ/mol 60.0520 ± 68941-70-8*1 Methyldioxirane CH3CH(OO) (g) -39.9 -53.8 ± 1.6 kJ/mol 60.0520 ± 70308-85-9*0 Hypochlorous acid HOCl (aq, undissoc) -125.526 ± 0.050 kJ/mol 52.46004 ± 7790-92-3*1000 Dioxygenyl ion monohydrate [(H2O)(O2)]+ (g) 829.1 822.0 ± 2.0 kJ/mol 50.01353 ± 11083-61-7*0 Isocyanic acid cation [HNCO]+ (g) 1003.01 1000.34 ± 0.49 kJ/mol 43.02423 ± 444010-28-0*0 Fulminic acid cation [HCNO]+ (g) 1215.7 1212.9 ± 1.3 kJ/mol 43.02423 ± 114766-65-3*0 Fluoronium [(HF)(H)]+ (g, triplet) 1490.1 1491.4 ± 1.9 kJ/mol 21.01373 ± 12206-67-6*1 1,2-Ethenediol HOCHCHOH (g, trans) -253.9 -266.2 ± 1.3 kJ/mol 60.0520 ± 1571-60-4*2 Acetyl chloride CH3C(O)Cl (l) -272.07 ± 0.39 kJ/mol 78.4973 ± 75-36-5*500 Methyl formate HC(O)OCH3 (l) -388.48 ± 0.64 kJ/mol 60.0520 ± 107-31-3*500 Ethyl formate HC(O)OCH2CH3 (g, anti) -355.3 -374.5 ± 1.4 kJ/mol 74.0785 ± 109-94-4*2 Acetoxy CH3C(O)O (g, 2A") -182.11 -190.93 ± 0.79 kJ/mol 59.0440 ± 13799-69-4*1 Trihydrogen dioxide anion [HOHOH]- (g) -487.4 -495.7 ± 1.1 kJ/mol 35.02317 ± 12501-19-8*0 2-Methoxy-2-oxoethyl CH2C(O)OCH3 (g, anti) -172.8 -188.0 ± 1.7 kJ/mol 73.0706 ± 54668-31-4*2 (Acetyloxy)methyl CH3C(O)OCH2 (g, anti) -173.8 -186.8 ± 1.7 kJ/mol 73.0706 ± 2887-49-2*2 Ammonium fluoride (NH4)F (cr,l) -452.48 -467.05 ± 0.38 kJ/mol 37.03690 ± 12125-01-8*500 Hydroxyoxoethenyl HOCCO (g) 24.5 22.7 ± 1.7 kJ/mol 57.0281 ± 702699-39-6*0 Oxochloronium [ClO]+ (g) 1150.86 1150.70 ± 0.66 kJ/mol 51.45155 ± 12301-79-0*0 Dioxymethylidyne COO (g) 299.8 301.1 ± 1.7 kJ/mol 44.00950 ± 791121-04-5*0 Fluorosyl fluoride FFO (g, triplet) 192.8 193.3 ± 2.3 kJ/mol 53.99621 ± 86825-57-2*1 Isocyanomethylidyne CNC (g) 672.1 676.5 ± 1.7 kJ/mol 38.0281 ± 53590-27-5*0 Cyanomethylidyne CCN (g) 684.7 689.1 ± 2.1 kJ/mol 38.0281 ± 4120-02-9*0 Cyanoaminylium [HNCN]+ (g, triplet) 1363.1 1360.8 ± 1.3 kJ/mol 41.03157 ± 205443-18-1*1 Cyanoamidogen anion [HNCN]- (g) 69.72 66.72 ± 0.72 kJ/mol 41.03267 ± 67131-47-9*0 Diazomethylium [HCNN]+ (g, triplet) 1395.7 1394.1 ± 1.3 kJ/mol 41.03157 ± 271249-81-1*1 Diazomethanide [HCNN]- (g) 305.17 302.08 ± 0.76 kJ/mol 41.03267 ± 100840-43-5*0 2-Methyliumylidynehydrazin-2-ium-1-ide [HNNC]+ (g, singlet) 1544.1 1542.4 ± 1.7 kJ/mol 41.03157 ± *947408-73-3*2 2-Methyliumylidynehydrazin-2-ium-1-ide [HNNC]+ (g, triplet) 1563.1 1561.5 ± 1.5 kJ/mol 41.03157 ± *947408-73-3*1 Nitrilomethylimidogen NCHN (g, doublet) 728.7 725.6 ± 2.4 kJ/mol 41.03212 ± 324529-58-0*1 Ammonium nitrate (NH4)NO3 (cr,l) -350.21 -365.17 ± 0.18 kJ/mol 80.04344 ± 6484-52-2*500 Methanediimine HNCNH (g) 153.1 146.5 ± 1.3 kJ/mol 42.04006 ± 151-51-9*0 Tetrachloromethane CCl4 (l) -104.57 -123.98 ± 0.41 kJ/mol 153.8215 ± 56-23-5*500 Ammonia NH3 (aq, undissoc) -80.884 ± 0.053 kJ/mol 17.03056 ± 7664-41-7*1000 Hydrogen fluoride HF (aq, 30 H2O) -321.89 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*820 Dichloromethylene anion [CCl2]- (g) 75.97 78.25 ± 0.77 kJ/mol 82.9166 ± 118364-73-1*0 Dichloromethylium [CHCl2]+ (g) 895.4 892.2 ± 1.2 kJ/mol 83.9235 ± 56932-33-3*0 Dichloromethide [CHCl2]- (g) -40.7 -42.4 ± 2.0 kJ/mol 83.9246 ± 32180-91-9*0 Chloromethylium [CH2Cl]+ (g) 962.4 958.5 ± 1.2 kJ/mol 49.4787 ± 59000-00-9*0 Chloromethylene CHCl (g, triplet) 346.23 346.53 ± 0.89 kJ/mol 48.4713 ± 2108-20-5*1 1,2-Dichloroethane CH2ClCH2Cl (cr,l) -165.66 ± 0.56 kJ/mol 98.9586 ± 107-06-2*500 1,1-Dichloroethane CH3CHCl2 (cr,l) -163.76 ± 0.48 kJ/mol 98.9586 ± 75-34-3*500 1,1,2-Trichloroethane CH2ClCHCl2 (l) -187.6 ± 1.1 kJ/mol 133.4033 ± 79-00-5*500 Pentachloroethane CHCl2CCl3 (g) -150.5 -156.5 ± 1.9 kJ/mol 202.2928 ± 76-01-7*0 Chloroform CHCl3 (l) -130.84 ± 0.42 kJ/mol 119.3767 ± 67-66-3*590 Chlorodibromomethane CHClBr2 (g) 22.0 3.2 ± 3.5 kJ/mol 208.2793 ± 124-48-1*0 2-Cyclopropyn-1-ylidene C(CC) (g, triplet) 898.4 905.3 ± 1.5 kJ/mol 36.0321 ± 102508-15-6*1 Bromochloromethane CH2ClBr (g) -28.2 -42.3 ± 1.3 kJ/mol 129.3833 ± 74-97-5*0 Fluoromethylene CHF (g) 148.39 148.68 ± 0.43 kJ/mol 32.01704 ± 13453-52-6*0 2-Cyclopropyn-1-ylium-1-yl [C(CC)]+ (g) 1939.1 1947.0 ± 1.3 kJ/mol 36.0316 ± 154702-35-9*0 Ethyl iodide CH3CH2I (g) 8.70 -7.17 ± 0.48 kJ/mol 155.9656 ± 75-03-6*0 Hydroxyimidogen NOH (g) 217.89 215.01 ± 0.78 kJ/mol 31.01408 ± 35337-59-8*0 1,2-Dibromoacetylene BrCCBr (g) 333.1 322.1 ± 2.3 kJ/mol 183.8294 ± 624-61-3*0 Nitrous acid HONO (g, cis) -71.37 -77.73 ± 0.26 kJ/mol 47.01348 ± 7782-77-6*2 Fluoro(fluorooxy)methylene FCOF (g, vdW triplet) -97.5 -95.7 ± 1.6 kJ/mol 66.00691 ± 479587-30-9*101 Fluorooxomethylium [FCO]+ (g) 724.9 724.5 ± 1.2 kJ/mol 47.00795 ± 38264-00-5*0 Fluoroisoformyl COF (g) -37.8 -32.4 ± 1.6 kJ/mol 47.00850 ± *1871-24-5*0 Benzene cation [C6H6]+ (g) 992.57 976.11 ± 0.21 kJ/mol 78.1113 ± 34504-50-2*0 Azidonitrene NNNN (g, Cs) 692.1 687.5 ± 1.4 kJ/mol 56.02696 ± 147363-92-6*2 Benzocyclopropene CH2(CCHCHCHCHC) (g, singlet) 395.9 379.6 ± 1.5 kJ/mol 90.1225 ± 4646-69-9*2 3-Methylphenyl C6H4CH3 (g, meta) 324.4 306.4 ± 1.2 kJ/mol 91.1305 ± 3474-41-7*0 2-Methylphenyl C6H4CH3 (g, ortho) 324.5 306.5 ± 1.2 kJ/mol 91.1305 ± 22904-44-5*0 4-Methylphenyl C6H4CH3 (g, para) 327.2 309.2 ± 1.2 kJ/mol 91.1305 ± 2396-02-3*0 1,3-Butadiyne-1,4-diyl CCCC (g) 1052.20 1062.17 ± 0.64 kJ/mol 48.0428 ± 78015-07-3*0 Indenylium [C6H4(CHCHCH)]+ (g, singlet) 1030.2 1010.7 ± 2.0 kJ/mol 115.1513 ± 12203-21-3*2 Benzoic acid C6H5C(O)OH (cr,l) -367.34 -384.75 ± 0.17 kJ/mol 122.1213 ± 65-85-0*500 2,3-Dimethylbenzaldehyde CH3C6H3(CH3)C(O)H (g, ortho-meta) -65.7 -93.7 ± 2.4 kJ/mol 134.1751 ± 5779-93-1*0 (2,3-dimethylphenyl)oxomethyl CH3C6H3(CH3)CO (g, ortho-meta) 83.2 60.5 ± 2.6 kJ/mol 133.1672 ± *104680-89-9*0 m-Chlorophenide [C6H4Cl]- (g) 172.5 162.3 ± 1.5 kJ/mol 111.5492 ± 77748-34-6*0 p-Chlorophenide [C6H4Cl]- (g) 179.5 169.1 ± 1.5 kJ/mol 111.5492 ± 77748-42-6*0 o-Chlorophenide [C6H4Cl]- (g) 158.6 148.7 ± 1.5 kJ/mol 111.5492 ± 72863-53-7*0 2-Oxopropylium [CH3C(O)CH2]+ (g) 784.7 770.9 ± 1.7 kJ/mol 57.0707 ± 54088-52-7*0 Nitronium [ONO]+ (g) 961.79 958.23 ± 0.20 kJ/mol 46.00499 ± 14522-82-8*0 2,3-Butanedione CH3C(O)C(O)CH3 (g) -310.68 -327.24 ± 0.62 kJ/mol 86.0892 ± 431-03-8*0 1,2-Dibromoethane CH2BrCH2Br (g) -11.5 -38.3 ± 1.2 kJ/mol 187.8612 ± 106-93-4*0 Dimethylketene CH3C(CO)CH3 (g) -73.3 -88.2 ± 1.2 kJ/mol 70.0898 ± 598-26-5*0 2-Methyloxirene CH3C(CHO) (g, t-triplet) 344.0 334.0 ± 1.8 kJ/mol 56.0633 ± 2835-41-8*11 3-Oxo-1-propenylium [CHCHCHO]+ (g, anti-trans-triplet) 1185.6 1179.6 ± 3.0 kJ/mol 55.0548 ± 101705-90-2*111 (Hydroxyimino)methyl HCNOH (g, trans-trans) 250.2 244.0 ± 1.8 kJ/mol 44.03272 ± 206442-92-4*1 Aminohydroxymethylene NH2COH (g, anti-singlet) -22.4 -33.0 ± 1.6 kJ/mol 45.04066 ± 160720-48-9*21 Hydroxydioxonitrate [HON(O)O]- (g) -193.2 -197.5 ± 2.4 kJ/mol 63.01343 ± 58875-09-5*0 Fluorochlorate [ClF]- (g) -256.03 -255.43 ± 0.81 kJ/mol 54.45165 ± 12272-56-9*0 1-Isocyanoethylidene CH3CNC (g, triplet) 545.6 540.7 ± 1.6 kJ/mol 53.0627 ± *498544-34-6*1 Peroxyimidogen NOO (g) 405.4 403.4 ± 1.9 kJ/mol 46.00554 ± *60488-31-5*0 3-Imino-2-propen-1-ylidene CHCHCNH (g, anti-triplet) 571.8 566.9 ± 1.6 kJ/mol 53.0627 ± 916765-05-4*21 2-(Methylidyneamino)ethenyl CHCHNCH (g, anti-triplet) 634.5 629.8 ± 1.6 kJ/mol 53.0627 ± 123416-74-0*21 Azete (CHCHCH)N (g) 469.5 461.4 ± 1.5 kJ/mol 53.0627 ± 287-24-1*0 2-Cyanovinylium [CHCHCN]+ (g, anti triplet) 1517.3 1515.1 ± 1.8 kJ/mol 52.0542 ± 85398-67-0*21 2-Cyanovinyl anion [CHCHCN]- (g, syn) 263.7 260.8 ± 1.8 kJ/mol 52.0553 ± *85398-67-0*2 2-Isocyanovinyl CHCHNC (g, anti) 543.2 541.3 ± 1.7 kJ/mol 52.0547 ± 225798-14-1*1 3-Oxo-1,2-propadienylidene CCCO (g) 330.4 336.4 ± 1.8 kJ/mol 52.0315 ± 11127-17-6*0 Vinylacetylene cation [CH2CHCCH]+ (g) 1221.8 1215.3 ± 1.1 kJ/mol 52.0740 ± 59699-48-8*0 Bicyclo[1.1.0]but-2-ylium-1-yl [CH2(CCH)CH]+ (g) 1287.1 1278.1 ± 1.4 kJ/mol 52.0740 ± *78525-41-4*0 3-Methylene-1-cyclopropen-1-yl anion [CH2C(CHC)]- (g) 417.3 413.6 ± 1.6 kJ/mol 51.0672 ± *117469-28-0*0 2-Cyclopropen-1-ylidenemethyl CHC(CHCH) (g) 635.8 632.7 ± 1.3 kJ/mol 51.0666 ± 127611-25-0*0 Fulvenone OCC(CHCHCHCH) (g) 117.3 107.1 ± 1.6 kJ/mol 92.0954 ± 4727-22-4*0 Silicon cation Si+ (g) 1236.86 1240.99 ± 0.56 kJ/mol 28.08495 ± 14067-07-3*0 Disilicon Si2 (g) 587.5 591.3 ± 1.6 kJ/mol 56.17100 ± 12597-35-2*0 Triiodide [I3]- (g) -254.3 -257.5 ± 3.4 kJ/mol 380.713959 ± 14900-04-0*0 Ethylene cation [CH2CH2]+ (g) 1075.21 1067.99 ± 0.11 kJ/mol 28.0526 ± 34470-02-5*0 Fluorosilyliumylidene [SiF]+ (g) 651.11 652.24 ± 0.98 kJ/mol 47.08335 ± 12518-09-1*0 Oxadiazirene O(NN) (g) 351.7 349.9 ± 1.7 kJ/mol 44.01288 ± 227934-45-4*0 Disiloxane SiH3OSiH3 (g) -330.3 -347.3 ± 2.3 kJ/mol 78.21804 ± 13597-73-4*0 Iodotrimethylsilane SiI(CH3)3 (g) -189.7 -214.5 ± 2.1 kJ/mol 200.0935 ± 16029-98-4*0 NON NON (g) 545.5 542.6 ± 1.7 kJ/mol 44.01288 ± 227934-46-5*0 Chlorine oxide peroxide OClOO (g, vdW) 226.8 227.7 ± 2.2 kJ/mol 83.4509 ± 141801-67-4*100 1,2,3,5-Hexatetraene CH2CCCHCHCH2 (g, trans) 391.8 380.0 ± 1.6 kJ/mol 78.1118 ± 60239-33-0*1 1,2,3-Pentatriene CH2CCCHCH3 (g) 302.7 290.4 ± 1.4 kJ/mol 66.1011 ± 62018-46-6*0 (Z)-1-Methylallyl CH3CHCHCH2 (g, cis) 154.73 137.34 ± 0.99 kJ/mol 55.0984 ± 98705-00-1*0 2,4-Cyclopentadien-1-ylidene C(CHCHCHCH) (g, triplet) 526.1 517.2 ± 1.1 kJ/mol 64.0853 ± 4729-01-5*1 Anthracene C6H4(CH(CC(C4H4)CH)) (g) 255.99 226.97 ± 0.92 kJ/mol 178.2292 ± 120-12-7*0 Helium hydride cation [HeH]+ (g) 1350.148 1348.258 ± 0.000 kJ/mol 5.009993 ± 17009-49-3*0 Monosulfur anion S- (g) 76.42 78.48 ± 0.14 kJ/mol 32.0665 ± 14337-03-2*0 Thiozone SSS (g) 144.27 142.91 ± 0.71 kJ/mol 96.1980 ± 12597-03-4*0 Hydrosulfide [SH]- (g) -80.53 -80.53 ± 0.18 kJ/mol 33.0745 ± 15035-72-0*0 Sulfuric acid OS(O)(OH)2 (aq, 2500 H2O) -895.16 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*898 Hydrogen sulfate [OHS(O)(O)O]- (g) -944.0 -954.4 ± 1.4 kJ/mol 97.0721 ± 14996-02-2*0 Dioxoperoxysulfate [OS(O)OO]- (g, C1) -502.6 -506.5 ± 2.0 kJ/mol 96.0641 ± 103613-08-7*1 Dimethyl sulfide CH3SCH3 (cr,l) -63.12 -64.72 ± 0.33 kJ/mol 62.1350 ± 75-18-3*500 (Methylthio)methyl CH3SCH2 (g) 149.5 137.8 ± 1.4 kJ/mol 61.1271 ± 31533-72-9*0 Hydrogen atom H (ad, 1 Pt(111) fcc) -22.3 -25.6 ± 1.5 kJ/mol 1.007940 ± 12385-13-6*1001001 Hydrogen atom H (ad, 4 Pt(111) fcc) -33.4 -36.7 ± 1.5 kJ/mol 1.007940 ± 12385-13-6*1001004 Chlorine difluoride anion [FClF]- (g) -504.9 -505.7 ± 1.9 kJ/mol 73.45005 ± 16892-05-0*0 Propylidene CH3CH2CH (g, singlet TS anti) 355.7 340.4 ± 2.0 kJ/mol 42.0797 ± 6700-78-3*21 Chlorine difluoride ClFF (g) 22.5 23.9 ± 1.9 kJ/mol 73.44951 ± 91483-78-2*0 Cyclopropylium [CH(CH2CH2)]+ (g, TS) 1101.54 1088.74 ± 0.73 kJ/mol 41.0713 ± 1724-43-2*200 Propyne cation [CH3CCH]+ (g) 1192.66 1186.94 ± 0.38 kJ/mol 40.0633 ± 34526-53-9*0 Cyclopropylidene C(CH2CH2) (g, triplet) 544.8 536.0 ± 1.5 kJ/mol 40.0639 ± 2143-70-6*2 Dioxofluorine OFO (g) 524.0 523.2 ± 1.0 kJ/mol 50.99720 ± 175861-93-5*0 Bifluoride [FHF]- (g) -705.22 -709.07 ± 0.35 kJ/mol 39.005295 ± 18130-74-0*0 Hydrofluorate ion [HF]- (g) -75.6 -75.1 ± 1.8 kJ/mol 20.006892 ± 37249-79-9*0 Propynylidene cation [HCCCH]+ (g) 1409.59 1412.15 ± 0.82 kJ/mol 38.0474 ± 75123-91-0*0 Propynylidene HCCCH (g, trans singlet) 597.6 599.4 ± 1.1 kJ/mol 38.0480 ± 67152-18-5*4 Propadienylidenide [CH2CC]- (g) 381.17 382.07 ± 0.40 kJ/mol 38.0485 ± 109292-49-1*0 1,2-Propadien-1-ylium-1-yl [CH2CC]+ (g) 1561.6 1562.8 ± 1.4 kJ/mol 38.0474 ± 110714-00-6*0 Hydrogen peroxide cation [HOOH]+ (g, cis) 931.06 924.20 ± 0.98 kJ/mol 34.01413 ± 12325-10-9*2 n-Pentane CH3CH2CH2CH2CH3 (cr,l) -155.83 -172.80 ± 0.29 kJ/mol 72.1488 ± 109-66-0*500 iso-Pentane CH3CH2CH(CH3)2 (l) -178.20 ± 0.39 kJ/mol 72.1488 ± 78-78-4*500 neo-Pentane C(CH3)4 (l) -189.54 ± 0.38 kJ/mol 72.1488 ± 463-82-1*500 (E)-Diazene anion [HNNH]- (g, trans) 265.6 258.7 ± 2.0 kJ/mol 30.02991 ± *59952-06-6*0 Cyclopentane CH2(CH2CH2CH2CH2) (l) -104.65 ± 0.38 kJ/mol 70.1329 ± 287-92-3*590 [1.1.1]Propellane (CH2)3(CC) (g, singlet) 378.6 361.0 ± 1.5 kJ/mol 66.1011 ± 35634-10-7*2 Tetraoxidanyl (HOO)(O2) (g, vdW) 2.1 0.4 ± 2.9 kJ/mol 65.0055 ± 69696-93-1*100 2-Methylpentane CH3CH2CH2CH(CH3)2 (g) -134.48 -173.73 ± 0.73 kJ/mol 86.1754 ± 107-83-5*0 3-Methylpentane CH3CH2CH(CH3)CH2CH3 (g) -131.92 -171.43 ± 0.76 kJ/mol 86.1754 ± 96-14-0*0 2,3-Dimethylbutane CH3CH(CH3)CH(CH3)CH3 (g) -136.51 -177.61 ± 0.81 kJ/mol 86.1754 ± 79-29-8*0 Cyclohexane CH2(CH2CH2CH2CH2CH2) (l) -131.81 -155.94 ± 0.28 kJ/mol 84.1595 ± 110-82-7*500 (Z)-Diazene cation [HNNH]+ (g, cis) 1157.0 1150.2 ± 1.3 kJ/mol 30.02881 ± 86631-37-0*0 1,5-Hexadiene CH2CHCH2CH2CHCH2 (g) 108.49 83.90 ± 0.39 kJ/mol 82.1436 ± 592-42-7*0 1-Hydroxyethyl CH3CHOH (g) -42.73 -56.16 ± 0.46 kJ/mol 45.0605 ± 2348-46-1*0 2-Hydroxyethyl CH2CH2OH (g, staggered-anti) -5.8 -18.2 ± 1.5 kJ/mol 45.0605 ± 4422-54-2*3 1-Hydrazinylium-1-yl [NNH2]+ (g) 1143.4 1136.4 ± 1.4 kJ/mol 30.02881 ± 63986-30-1*0 Iminomethide [HCNH]- (g, cis) 252.6 248.9 ± 1.8 kJ/mol 28.03387 ± 90623-30-6*2 1-Hydroxyethenyl anion [CH2COH]- (g, syn) 15.1 7.8 ± 2.1 kJ/mol 43.0452 ± 112539-13-6*22 Iodine I (g, 2P1/2) 198.109 197.709 ± 0.0021 kJ/mol 126.904470 ± 14362-44-8*2 1-Chloro ozone anion [ClOOO]- (g, perp) -109.0 -111.5 ± 2.1 kJ/mol 83.4514 ± 224299-15-4*3 Hydrogen cyanide cation [HCN]+ (g) 1442.53 1442.06 ± 0.20 kJ/mol 27.02483 ± 12601-62-6*0 Dicarbon monoxide cation [CCO]+ (g) 1433.9 1439.0 ± 2.1 kJ/mol 40.0203 ± 12287-08-0*0 C=O-C cation [COC]+ (g, quartet) 1816.8 1820.9 ± 2.0 kJ/mol 40.0203 ± 83483-98-1*2 Oxirene anion [O(CHCH)]- (g) 288.1 285.2 ± 2.2 kJ/mol 42.0372 ± *157-18-6*0 Nitrilomethylium [CN]+ (g) 1783.12 1786.60 ± 0.48 kJ/mol 26.01689 ± 12539-57-0*0 Trifluoride ion [F3]- (g) -348.6 -349.4 ± 2.5 kJ/mol 56.9957582 ± 25730-99-8*0 Oxoethylidene HCC(O)H (g, triplet) 261.1 258.3 ± 1.1 kJ/mol 42.0367 ± 39920-84-8*1 Methanediol CH2(OH)2 (g) -378.48 -391.57 ± 0.62 kJ/mol 48.0413 ± 463-57-0*0 Ethoxyoxoniumylidene [CH3CH2OO]+ (g, cis singlet) 962.5 946.1 ± 1.7 kJ/mol 61.0594 ± 268728-77-4*22 Diazenide [NNH]- (g, triplet) 347.5 344.6 ± 1.6 kJ/mol 29.02197 ± 71004-29-0*1 2-Hydroperoxyethylium [CH2CH2OOH]+ (g, triplet) 1000.0 989.1 ± 1.6 kJ/mol 61.0594 ± *84824-62-4*1 Fluoroniumyl ion [HF]+ (g) 1275.556 1275.788 ± 0.022 kJ/mol 20.005795 ± 12381-92-9*0 Formic acid anion [HC(O)OH]- (g, anti) -241.2 -246.9 ± 1.9 kJ/mol 46.0259 ± 19066-82-1*2 Dioxirane cation [CH2(OO)]+ (g) 1050.8 1043.1 ± 2.0 kJ/mol 46.0248 ± 232262-10-1*0 Dioxymethyl cation [CH2OO]+ (g) 1074.8 1068.5 ± 1.7 kJ/mol 46.0248 ± 232262-11-2*0 Fluorine atom cation F+ (g) 1758.301 1760.600 ± 0.017 kJ/mol 18.99785462 ± 14701-13-4*0 1-(Dioxidan-2-id-1-yl)ethyl [CH3CHOO]- (g, anti) 27.7 16.1 ± 4.3 kJ/mol 60.0525 ± 1646268-48-5*1 1-(Dioxidan-2-id-1-yl)ethyl [CH3CHOO]- (g, syn) 28.1 16.3 ± 4.3 kJ/mol 60.0525 ± 1646268-48-5*2 Aminyliumyl [NH]+ (g) 1659.04 1659.96 ± 0.23 kJ/mol 15.014131 ± 19067-62-0*0 Dioxymethylene HCOO (g, cis) 341.8 339.8 ± 3.0 kJ/mol 45.0174 ± 438586-67-5*2 OH-CO vdW complex (OH)(CO) (g, vdW) -80.50 -76.77 ± 0.85 kJ/mol 45.0174 ± *2564-85-4*100 CO-HO vdW complex (CO)(HO) (g, vdW) -77.5 -73.3 ± 1.3 kJ/mol 45.0174 ± *2564-84-3*100 Bromine dioxide OBrO (g) 165.6 156.0 ± 2.1 kJ/mol 111.9028 ± 21255-83-4*0 Cyanato cation [NCO]+ (g) 1261.52 1262.02 ± 0.58 kJ/mol 42.01629 ± 17247-99-3*0 Nitrosomethyliumylidene [CNO]+ (g) 1509.8 1510.9 ± 1.7 kJ/mol 42.01629 ± 67197-19-7*0 Fulminate [CNO]- (g) 59.5 59.8 ± 1.7 kJ/mol 42.01739 ± 28269-67-2*0 Hydrogen fluoride HF (aq, 22 H2O) -321.85 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*902 Hydroxylamine NH2OH (g, cis) -15.3 -25.9 ± 1.4 kJ/mol 33.02996 ± 7803-49-8*2 Hydroxylamine cation [NH2OH]+ (g) 857.7 847.9 ± 1.6 kJ/mol 33.02941 ± 62675-55-2*0 Glyoxal OCHCHO (g, cis) -189.39 -194.84 ± 0.70 kJ/mol 58.0361 ± 107-22-2*2 Ethynediol HOCCOH (g) -18.3 -22.1 ± 1.6 kJ/mol 58.0361 ± 16005-17-7*0 Dimethylaminylium [(CH3)2N]+ (g) 1040.9 1025.5 ± 1.8 kJ/mol 44.0752 ± 49784-85-2*0 Trioxidanylium [HOOO]+ (g, cis) 1085.5 1079.2 ± 1.4 kJ/mol 49.00559 ± 74241-49-9*2 Nitrogen hydride oxide NH3O (g) 72.2 61.0 ± 1.3 kJ/mol 33.02996 ± 38544-48-8*0 Ethylimidogen CH3CH2N (g) 306.1 291.5 ± 2.0 kJ/mol 43.0678 ± 27770-44-1*0 Diisocyanogen CNNC (g) 610.9 613.2 ± 1.7 kJ/mol 52.0349 ± 78800-21-2*0 Cyanoamidogen anion [HNCN]- (g, c-triplet) 391.7 389.4 ± 1.8 kJ/mol 41.03267 ± 67131-47-9*12 1-Chloro ozone anion [ClOOO]- (g, cis) -66.9 -68.8 ± 2.1 kJ/mol 83.4514 ± 224299-15-4*1 Aminooxy cation [NH2O]+ (g) 945.98 938.85 ± 0.76 kJ/mol 32.02147 ± *51375-41-8*0 Diazirenide [HC(NN)]- (g) 454.9 452.2 ± 1.5 kJ/mol 41.03267 ± 130614-84-5*0 Cyanamide cation [NH2CN]+ (g) 1158.7 1152.4 ± 1.5 kJ/mol 42.03951 ± 148556-23-4*0 Dihydrooxooxygen cation [(H2O)O]+ (g) 994.9 988.2 ± 1.6 kJ/mol 34.01413 ± 177329-59-8*0 3-Diaziridinylidene C(NHNH) (g, anti) 521.8 515.0 ± 1.5 kJ/mol 42.04006 ± 85513-79-7*1 Diazomethylene CNN (g) 577.8 578.5 ± 2.2 kJ/mol 40.02418 ± 2468-81-7*0 Dichloromethylene CCl2 (g, triplet) 313.98 315.18 ± 0.90 kJ/mol 82.9161 ± 1605-72-7*1 Nitrosyl fluoride FNO (g) -85.48 -87.85 ± 0.76 kJ/mol 49.00454 ± 7789-25-5*0 Chloromethyliumyl [CHCl]+ (g) 1207.4 1207.7 ± 2.0 kJ/mol 48.4708 ± 89877-51-0*0 Chloromethylene anion [CHCl]- (g) 203.53 204.34 ± 0.94 kJ/mol 48.4719 ± 75466-08-9*0 Chlorohydroxymethyl CH(Cl)OH (g, anti-gauche) -46.0 -51.6 ± 2.0 kJ/mol 65.4787 ± 147139-06-8*2 Ethynylene cation [C2]+ (g) 1964.93 1971.52 ± 0.40 kJ/mol 24.0209 ± 12595-79-8*0 Hydroxyaminylium [HNOH]+ (g, cis) 1048.5 1041.3 ± 2.6 kJ/mol 32.02147 ± 66097-71-0*2 1,1,1,2-Tetrachloroethane CH2ClCCl3 (cr,l) -193.5 ± 1.1 kJ/mol 167.8481 ± 630-20-6*500 Hexachloroethane CCl3CCl3 (cr,l) -214.1 ± 2.8 kJ/mol 236.7376 ± 67-72-1*500 Hydroxyamidogen anion [HNOH]- (g) 90.7 84.8 ± 2.8 kJ/mol 32.02257 ± *66097-71-0*0 3-Chloro-3-methyl-3H-diazirine (NN)CClCH3 (g) 251.5 239.6 ± 2.7 kJ/mol 90.5114 ± 4222-21-3*0 trans-1,2-Dichloroethene CHClCHCl (g, trans) 5.63 0.21 ± 0.55 kJ/mol 96.9427 ± 156-60-5*0 Sulfuryl dichloride OS(O)Cl2 (g) -348.06 -354.22 ± 0.75 kJ/mol 134.9702 ± 7791-25-5*0 Ammonium hydroxide NH4OH (cr,l) -360.46 -361.54 ± 0.57 kJ/mol 35.04584 ± 1336-21-6*500 Fluorochlorobromomethane CHFClBr (g) -218.3 -230.9 ± 4.9 kJ/mol 147.3737 ± 593-98-6*0 Ammonium hydroxide NH4OH (aq) -362.837 ± 0.061 kJ/mol 35.04584 ± 1336-21-6*800 Fluoromethyliumyl [CHF]+ (g) 1116.6 1116.9 ± 1.7 kJ/mol 32.01649 ± 89877-52-1*0 Fluoromethylene anion [CHF]- (g) 95.94 96.47 ± 0.61 kJ/mol 32.01759 ± 71267-42-0*0 Trioxidanyl HOOO (g, cis) 26.35 23.08 ± 0.19 kJ/mol 49.00614 ± 12500-78-6*2 Polytetrafluoroethylene CF2CF2 (s) -829.96 ± 0.54 kJ/mol 100.0150 ± 9002-84-0*591 Methyleneoxonium cation [CH2OH2]+ (g) 827.8 818.3 ± 1.7 kJ/mol 32.04131 ± *177788-17-9*0 Chlorite [OClO]- (g) -105.51 -107.68 ± 0.37 kJ/mol 67.4520 ± 14998-27-7*0 trans-1,2-Difluoroethene CHFCHF (g, trans) -299.74 -306.18 ± 0.83 kJ/mol 64.0341 ± 1630-78-0*0 Deuterium atom cation D+ (g) 1532.210 1534.123 ± 0.000 kJ/mol 2.01355319809 ± 14464-47-2*0 Fluoroethynide [CCF]- (g) 133.3 137.5 ± 1.5 kJ/mol 43.0204 ± 85905-56-2*0 Formyl fluoride cation [CHFO]+ (g) 816.6 813.3 ± 1.3 kJ/mol 48.01589 ± 99766-68-4*0 Formyl fluoride [FCO]- (g) -405.2 -403.7 ± 1.6 kJ/mol 47.00905 ± 62227-71-8*0 Fluoroisoformyl cation [COF]+ (g) 1347.4 1349.5 ± 1.9 kJ/mol 47.00795 ± *1871-25-6*0 Trioxidaniumyl [HOOOH]+ (g, c, t) 935.2 926.1 ± 1.5 kJ/mol 50.01353 ± 161321-37-5*3 o-Benzyne cation [C6H4]+ (g) 1392.1 1384.1 ± 1.6 kJ/mol 76.0954 ± 70220-84-7*0 Nitrous acid HONO (g) -72.986 -78.643 ± 0.078 kJ/mol 47.01348 ± 7782-77-6*0 Azidonitrene NNNN (g, C2h) 660.8 657.7 ± 1.6 kJ/mol 56.02696 ± 147363-92-6*1 m-Benzyne cation [C6H4]+ (g) 1363.1 1354.5 ± 1.5 kJ/mol 76.0954 ± 121058-08-0*0 p-Benzyne C6H4 (g, triplet) 603.5 594.2 ± 1.2 kJ/mol 76.0960 ± 3355-34-8*1 1,3-Cycloheptadiene CH2(CHCHCHCHCH2CH2) (g, c-c) 123.65 94.54 ± 0.78 kJ/mol 94.1543 ± 4054-38-0*1 Tropylium [CH(CHCHCHCHCHCH)]+ (g) 899.19 879.42 ± 0.99 kJ/mol 91.1299 ± 26811-28-9*0 Hydroxymethylene cation [HCOH]+ (g, cis) 986.4 982.8 ± 1.6 kJ/mol 30.02543 ± 135395-06-1*2 Hydroxymethylene cation [HCOH]+ (g, gauche quartet) 1482.1 1479.4 ± 1.9 kJ/mol 30.02543 ± 135395-06-1*3 Hexafluorobenzene C6F6 (cr,l) -997.17 -983.38 ± 0.87 kJ/mol 186.0546 ± 392-56-3*500 Hydroxymethylene anion [HCOH]- (g, cis) 160.2 157.5 ± 1.7 kJ/mol 30.02653 ± 207914-87-2*2 Hydroxymethylene anion [HCOH]- (g, gauche quartet) 334.0 334.8 ± 2.1 kJ/mol 30.02653 ± 207914-87-2*3 Dihydrogen fluoride (H)(HF) (g) -55.9 -54.9 ± 1.6 kJ/mol 21.01428 ± 12592-22-2*1 Perchlorate [OCl(O)(O)O]- (g) -263.9 -272.8 ± 2.1 kJ/mol 99.4508 ± 14797-73-0*0 cis-1,2-Dibromoethene CHBrCHBr (g, cis) 121.5 100.9 ± 2.0 kJ/mol 185.8453 ± 590-11-4*0 1,1-Dibromoethane CH3CHBr2 (g) -4.8 -31.8 ± 1.8 kJ/mol 187.8612 ± 557-91-5*0 Aquacarbon H2OC (g, singlet vdW) 467.6 465.5 ± 1.9 kJ/mol 30.02598 ± 81434-73-3*102 Aquacarbon cation [H2OC]+ (g) 1196.1 1193.0 ± 1.7 kJ/mol 30.02543 ± *81434-73-3*0 Ethane cation [CH3CH3]+ (g) 1043.13 1029.12 ± 0.59 kJ/mol 30.0685 ± 34488-65-8*0 Dioxaziridinyl cation [N(OO)]+ (g) 1365.9 1363.3 ± 1.7 kJ/mol 46.00499 ± *66252-29-7*0 Carbamoyl HNCOH (g, trans-trans) 74.1 67.7 ± 2.7 kJ/mol 44.03272 ± *2858-51-7*1 Formaldiminoxy CH2NO (g) 160.9 154.0 ± 1.5 kJ/mol 44.03272 ± 2683-96-7*0 Formaldoxime CH2NOH (g, cis) 50.7 39.8 ± 1.8 kJ/mol 45.04066 ± 75-17-2*2 Oxaziridine CH2(NHO) (g) 115.6 103.8 ± 2.1 kJ/mol 45.04066 ± 6827-26-5*0 Cyanoethynyl CCCN (g) 715.7 722.2 ± 1.1 kJ/mol 50.0388 ± 62435-43-2*0 Perchloryloxy OCl(O)(O)O (g) 248.4 240.8 ± 1.8 kJ/mol 99.4503 ± 12133-63-0*0 Dioxaziridinyl anion [N(OO)]- (g) 295.9 293.4 ± 1.7 kJ/mol 46.00609 ± 66252-31-1*0 Peroxyimidogen cation [NOO]+ (g) 1409.7 1406.8 ± 1.9 kJ/mol 46.00499 ± *60488-32-6*0 Fluorodioxidenium [FOO]+ (g) 1221.9 1219.5 ± 2.0 kJ/mol 50.99665 ± 139584-95-5*0 2-Methylene-2H-azirine (CHN)CCH2 (g) 404.3 396.9 ± 1.7 kJ/mol 53.0627 ± 110027-86-6*0 Peroxyimidogen anion [NOO]- (g) 165.0 162.7 ± 1.7 kJ/mol 46.00609 ± 60488-31-5*0 2-Cyanovinylium [CHCHCN]+ (g, syn triplet) 1517.4 1515.2 ± 1.8 kJ/mol 52.0542 ± 85398-67-0*22 2-Cyanovinyl anion [CHCHCN]- (g, anti) 266.2 263.3 ± 1.8 kJ/mol 52.0553 ± *85398-67-0*1 Fluorodioxidanide [FOO]- (g) -256.8 -256.1 ± 1.9 kJ/mol 50.99775 ± 23553-17-5*0 2-Isocyanovinyl CHCHNC (g, syn) 544.6 542.6 ± 1.7 kJ/mol 52.0547 ± 225798-14-1*2 Cyanomethylene HCCN (g, singlet) 529.4 530.4 ± 1.3 kJ/mol 39.0361 ± 2612-62-6*2 Nitric acid HON(O)O (cr,l) -178.99 -173.26 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*500 Isocyanomethylene HCNC (g, triplet) 585.2 586.3 ± 1.6 kJ/mol 39.0361 ± 78694-65-2*2 Nirous oxide cation [NNO]+ (g) 1329.69 1326.80 ± 0.12 kJ/mol 44.01233 ± 12269-46-4*0 3-Methylcycloprop-3-en-2-ylium-1-yl [CH3C(CHC)]+ (g) 1284.0 1277.5 ± 1.5 kJ/mol 52.0740 ± *185841-59-2*0 Peroxyformic acid HC(O)OOH (g, gauche) -265.2 -273.1 ± 1.4 kJ/mol 62.0248 ± 107-32-4*3 Vinylvinylidene cation [CH2CHCHC]+ (g, trans) 1429.9 1424.2 ± 2.0 kJ/mol 52.0740 ± 161054-20-2*1 1,2-Butadien-1-ylidene CH3CHCC (g, singlet) 511.8 506.3 ± 2.0 kJ/mol 52.0746 ± 119908-55-3*2 1-Buten-3-ynylium [HCCCHCH]+ (g, trans) 1482.4 1479.9 ± 1.4 kJ/mol 51.0661 ± 84654-85-3*1 3-Buten-1-ynylium [CH2CHCC]+ (g, triplet) 1572.7 1570.3 ± 1.7 kJ/mol 51.0661 ± 103928-84-3*1 3-Methylene-1-cyclopropen-1-ylium [CH2C(CHC)]+ (g, singlet) 1398.8 1395.5 ± 1.7 kJ/mol 51.0661 ± 117469-28-0*2 Butyraldehyde CH3CH2CH2CHO (g) -185.28 -205.65 ± 0.85 kJ/mol 72.1057 ± 123-72-8*0 Chloroallene CH2CCHCl (g) 181.9 175.2 ± 1.6 kJ/mol 74.5086 ± 3223-70-9*0 1-Chloropropyne CH3CCCl (g) 192.0 187.9 ± 1.6 kJ/mol 74.5086 ± 7747-84-4*0 Methylcyclopentane CH3CH(CH2CH2CH2CH2) (g) -68.61 -106.13 ± 0.36 kJ/mol 84.1595 ± 96-37-7*0 Dioxosilane SiO2 (cr,l) -906.77 -911.75 ± 0.63 kJ/mol 60.08430 ± 7631-86-9*500 Dioxosilane SiO2 (vitr) -826.32 -902.25 ± 0.64 kJ/mol 60.08430 ± 7631-86-9*520 Silicon carbide cation [SiC]+ (g) 1604.8 1609.4 ± 2.4 kJ/mol 40.09565 ± 78393-58-5*0 Tetrafluorosilane cation [SiF4]+ (g) -138.1 -142.4 ± 9.4 kJ/mol 104.07856 ± 62859-94-3*0 Ethylene anion [CH2CH2]- (g, anti ?) 232.0 224.4 ± 2.0 kJ/mol 28.0537 ± 34527-91-8*1 Difluorosilyliumyl [SiF2]+ (g) 416.0 415.3 ± 2.0 kJ/mol 66.08176 ± 37300-76-8*0 Silyliumyl [SiH2]+ (g) 1155.47 1153.85 ± 0.93 kJ/mol 30.10083 ± 28149-31-7*0 Disilanyl anion [SiH3SiH2]- (g) 63.3 50.9 ± 2.1 kJ/mol 61.21125 ± 53199-49-8*0 Disilene SiH2SiH2 (g, triplet) 393.4 384.9 ± 2.2 kJ/mol 60.20276 ± 15435-77-5*1 Di-mu-hydrodihydrodisilicon HSi(HSiHH) (g, cis-singlet) 385.7 375.3 ± 2.6 kJ/mol 60.20276 ± 129970-82-7*22 Dihydrogen fluoride anion [(HF)(H)]- (g, singlet) -61.9 -60.5 ± 3.2 kJ/mol 21.01483 ± 117339-92-1*2 Iodosilane SiH3I (g) 6.9 -2.8 ± 2.6 kJ/mol 158.01379 ± 13598-42-0*0 Trimethylsilanide [Si(CH3)3]- (g) -42.0 -65.5 ± 2.1 kJ/mol 73.1896 ± 54711-92-1*0 Oxadiazirine anion [O(NN)]- (g) 95.1 95.5 ± 2.9 kJ/mol 44.01343 ± 350586-31-1*0 (3E)-1,3-Hexadien-5-yne CH2CHCHCHCCH (g, trans) 358.9 346.6 ± 1.9 kJ/mol 78.1118 ± 5222-77-5*0 Divinylacetylene CH2CHCCCHCH2 (g, cis) 361.9 350.5 ± 1.9 kJ/mol 78.1118 ± 821-08-9*2 Fluorosyl fluoride anion [FFO]- (g, doublet) -147.1 -146.8 ± 3.0 kJ/mol 53.99675 ± *86825-57-2*2 1,2,4-Cyclohexatriene CH2(CHCHCHCCH) (g) 419.5 403.6 ± 2.0 kJ/mol 78.1118 ± 124869-33-6*0 Peroxychlorite [OClOO]- (g, triplet) -116.2 -114.8 ± 2.3 kJ/mol 83.4514 ± 852472-63-0*1 Ethylammoniumyl [CH3CH2NH2]+ (g) 827.6 807.6 ± 1.6 kJ/mol 45.0832 ± 41857-50-5*0 2-Methyl-2-propanamine (CH3)3CNH2 (g) -87.02 -120.68 ± 0.55 kJ/mol 73.1369 ± 75-64-9*0 Trioxodinitrate anion [ONN(O)O]- (g, vdW) -104.2 -107.5 ± 1.9 kJ/mol 76.01223 ± 194856-62-7*100 Benzophenone C6H5C(O)C6H5 (g) 80.7 51.4 ± 1.5 kJ/mol 182.2179 ± 119-61-9*0 Helium He (g, triplet) 1912.302 1912.302 ± 0.000 kJ/mol 4.0026020 ± 7440-59-7*1 Helium cation He+ (g) 2372.322 2372.322 ± 0.000 kJ/mol 4.0020534 ± 14234-48-1*0 Neonium [NeH]+ (g) 1324.85 1323.04 ± 0.87 kJ/mol 21.18709 ± 12200-65-6*0 Kryptonium [KrH]+ (g) 1106.29 1104.50 ± 0.68 kJ/mol 84.8074 ± 37276-90-7*0 Monosulfur cation S+ (g) 1276.42 1278.21 ± 0.14 kJ/mol 32.0655 ± 14701-12-3*0 Trichlorine cation [Cl3]+ (g, singlet) 1056.6 1055.5 ± 1.4 kJ/mol 106.3576 ± 33088-85-6*2 Oxosulfur [SO]+ (g) 999.26 999.87 ± 0.13 kJ/mol 48.0649 ± 767269-11-4*0 Hydrogen oxide sulfide H2OS (g) 51.1 45.1 ± 1.4 kJ/mol 50.0813 ± 155348-09-7*0 Trichloride [Cl3]- (g) -328.5 -327.6 ± 1.3 kJ/mol 106.3586 ± 18434-33-8*0 Sulfuric acid OS(O)(OH)2 (aq, 75 H2O) -887.18 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*825 Sulfuric acid OS(O)(OH)2 (aq, 7000 H2O) -899.22 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*846 Nitrosyl nitrate ON(O2)NO (g, perp) 70.6 62.3 ± 1.8 kJ/mol 92.0111 ± *15969-55-8*0 Hydrogen sulfite [OS(OH)O]- (g) -684.8 -692.1 ± 1.8 kJ/mol 81.0727 ± 15181-46-1*0 Dioxoperoxysulfane (O2S)(OO) (g, singlet C1) -176.7 -177.7 ± 2.1 kJ/mol 96.0636 ± *103613-08-7*11 Dioxoperoxysulfane (O2S)(OO) (g, triplet C1) -296.1 -296.1 ± 2.0 kJ/mol 96.0636 ± *103613-08-7*21 Dioxoperoxysulfate dianion [OS(O)OO]-2 (g, C1) -209.1 -214.8 ± 2.1 kJ/mol 96.0647 ± *14808-79-8*1 Ethanethiol CH3CH2SH (cr,l) -71.49 -73.10 ± 0.37 kJ/mol 62.1350 ± 75-08-1*500 Dimethylsulfoxide CH3S(O)CH3 (cr,l) -201.94 -203.59 ± 0.49 kJ/mol 78.1344 ± 67-68-5*500 Carbon monosulfide CS (g) 278.90 282.14 ± 0.68 kJ/mol 44.0767 ± 2944-05-0*0 Platinum Pt (g) 563.4 564.3 ± 1.7 kJ/mol 195.0780 ± 7440-06-4*0 Acetylene anion [HCCH]- (g, trans ?) 356.9 356.7 ± 1.9 kJ/mol 26.0378 ± 50443-89-5*1 Dibromine Br2 (aq) -2.25 ± 0.18 kJ/mol 159.8080 ± 7726-95-6*800 Cyclohexene CH2(CHCHCH2CH2CH2) (g) 27.17 -4.30 ± 0.32 kJ/mol 82.1436 ± 110-83-8*0 Cyclohexene CH2(CHCHCH2CH2CH2) (cr,l) -21.98 -37.85 ± 0.30 kJ/mol 82.1436 ± 110-83-8*500 Difluoronitrate [NF2]- (g) -70.7 -72.6 ± 1.9 kJ/mol 52.004095 ± 37366-64-6*0 Methyleneaminylium [CH2N]+ (g, triplet) 1456.7 1453.0 ± 2.1 kJ/mol 28.03277 ± 53518-13-1*1 1-Hydroxyethanide [CH3CHOH]- (g) -20.3 -33.7 ± 2.2 kJ/mol 45.0610 ± 88032-18-2*0 (Methylmethylene)oxonium [CH3OCH2]+ (g) 686.0 671.7 ± 2.2 kJ/mol 45.0600 ± 23653-97-6*0 Methoxymethyl anion [CH3OCH2]- (g) 23.4 10.4 ± 2.3 kJ/mol 45.0610 ± 61192-30-1*0 Acetaldehyde anion [CH3CHO]- (g) -62.1 -72.4 ± 2.2 kJ/mol 44.0531 ± 60427-04-5*0 1,3-Propanediyl CH2CH2CH2 (g, singlet C2v TS EE) 337.7 323.0 ± 2.2 kJ/mol 42.0797 ± 32458-33-6*21 Ammonium radical NH4 (g) 190.01 179.43 ± 0.43 kJ/mol 18.03850 ± 92075-50-8*0 Ketene cation [CH2CO]+ (g) 882.23 879.06 ± 0.11 kJ/mol 42.0361 ± 64999-16-2*0 Ketene anion [CH2CO]- (g) -16.0 -19.1 ± 2.2 kJ/mol 42.0372 ± 56391-79-8*0 Aminomethyliumylidene [CNH2]+ (g) 1168.3 1165.1 ± 2.2 kJ/mol 28.03277 ± 86784-42-1*0 Oxoethenylium [HCCO]+ (g) 1139.7 1142.4 ± 2.1 kJ/mol 41.0282 ± 92056-63-8*0 Bromine atom Br (g, 2P3/2) 117.925 111.863 ± 0.055 kJ/mol 79.90400 ± 10097-32-2*1 Trifluorine cation [F3]+ (g) 1530.0 1527.9 ± 2.2 kJ/mol 56.9946610 ± 64710-22-1*0 Hypofluorous acid anion [HOF]- (g, quartet) 155.3 154.7 ± 2.6 kJ/mol 36.00629 ± 36505-07-4*2 Hypochlorous acid cation [HOCl]+ (g) 998.94 995.89 ± 0.90 kJ/mol 52.45949 ± 71606-47-8*0 Acetylene anion [HCCH]- (g, cis ?) 380.1 380.3 ± 1.9 kJ/mol 26.0378 ± 50443-89-5*2 Oxiranylidene CH2(CO) (g, triplet) 456.1 452.1 ± 2.2 kJ/mol 42.0367 ± 50983-85-2*1 Oxiranylidene cation [CH2(CO)]+ (g) 1165.4 1161.9 ± 2.5 kJ/mol 42.0361 ± *50983-85-2*0 Oxiranylidene anion [CH2(CO)]- (g) 236.3 232.4 ± 2.3 kJ/mol 42.0372 ± *50983-86-3*0 Carbon tetracation [C]+4 (g) 14993.597 14998.744 ± 0.049 kJ/mol 12.00851 ± 16092-62-9*0 Methyl hydroperoxide cation [CH3OOH]+ (g) 833.8 819.7 ± 2.0 kJ/mol 48.0407 ± 112465-88-0*0 Hydrogen difluoride cation [FFH]+ (g, singlet) 1174.3 1171.3 ± 1.5 kJ/mol 39.004198 ± *126950-54-7*2 Hypochlorous acid anion [HOCl]- (g) 198.7 198.4 ± 2.5 kJ/mol 52.46059 ± 34524-94-2*0 Dihydroxymethylium [CH(OH)2]+ (g, syn-anti) 421.5 410.2 ± 3.0 kJ/mol 47.0328 ± 180071-68-5*1 Hydroxymethoxy cation [CH2(OH)O]+ (g, triplet gauche) 925.0 914.7 ± 3.2 kJ/mol 47.0328 ± 180071-69-6*13 Oxybismethanol HOCH2OCH2OH (g, C1 I) -534.2 -557.2 ± 1.9 kJ/mol 78.0672 ± 4407-89-0*11 Methoxyoxoniumylidene [CH3OO]+ (g) 1012.31 1003.48 ± 0.67 kJ/mol 47.0328 ± 86475-50-5*0 Ethylperoxy CH3CH2OO (g, trans) -5.35 -21.45 ± 0.87 kJ/mol 61.0599 ± 3170-61-4*1 Fluoronium [HFH]+ (g) 774.04 771.10 ± 0.91 kJ/mol 21.01373 ± 12206-67-6*0 Dichlorine Cl2 (aq, undissoc) -16.473 ± 0.090 kJ/mol 70.9054 ± 7782-50-5*1000 Formic acid HC(O)OH (cr,l) -431.50 -424.67 ± 0.20 kJ/mol 46.0254 ± 64-18-6*500 Dioxirane anion [CH2(OO)]- (g) -173.0 -179.8 ± 3.4 kJ/mol 46.0259 ± *157-26-6*0 Dioxymethyl anion [CH2OO]- (g) 54.9 49.7 ± 1.4 kJ/mol 46.0259 ± 93207-29-5*0 Aminomethyl anion [CH2NH2]- (g) 209.5 199.2 ± 2.1 kJ/mol 30.04975 ± 74215-21-7*0 H-CO2 vdW complex (H)(OCO) (g, vdW) -178.3 -177.5 ± 2.1 kJ/mol 45.0174 ± *2564-83-2*100 Imidogen anion [NH]- (g) 322.63 322.68 ± 0.16 kJ/mol 15.015229 ± 23841-33-0*0 2-Propanol CH3CH(OH)CH3 (cr,l) -305.34 -318.15 ± 0.26 kJ/mol 60.0950 ± 67-63-0*500 1-Propanol CH3CH2CH2OH (cr,l) -290.28 -302.46 ± 0.19 kJ/mol 60.0950 ± 71-23-8*500 Hydrogen chloride HCl (aq, 74 H2O) -165.545 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*953 Carbon C (g, triplet) 711.381 716.866 ± 0.039 kJ/mol 12.01070 ± 7440-44-0*1 Carbon C (g, singlet) 833.312 838.459 ± 0.039 kJ/mol 12.01070 ± 7440-44-0*2 Oxazirinyl cation [C(NO)]+ (g) 1565.5 1566.2 ± 2.3 kJ/mol 42.01629 ± *228850-18-8*0 Oxazirinyl anion [C(NO)]- (g) 448.2 449.0 ± 2.4 kJ/mol 42.01739 ± 28269-68-3*0 Hydrogen chloride HCl (aq, 75 H2O) -165.555 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*825 Acetic acid CH3C(O)OH (cr,l) -484.03 -483.60 ± 0.18 kJ/mol 60.0520 ± 64-19-7*500 Acetic acid CH3C(O)OH (aq, 75 H2O) -484.61 ± 0.33 kJ/mol 60.0520 ± 64-19-7*825 Acetic acid CH3C(O)OH (aq, 1500 H2O) -484.82 ± 0.33 kJ/mol 60.0520 ± 64-19-7*840 Imidogen NH (g, triplet) 358.75 358.79 ± 0.16 kJ/mol 15.014680 ± 13774-92-0*1 Hydrogen chloride HCl (aq, 140 H2O) -165.945 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*907 Isocyanomethylium [CH2NC]+ (g) 1272.6 1270.4 ± 2.2 kJ/mol 40.0435 ± 78269-43-9*0 Ethyl formate HC(O)OCH2CH3 (cr,l) -425.9 ± 1.1 kJ/mol 74.0785 ± 109-94-4*500 Propionic acid CH3CH2C(O)OH (g, anti) -415.4 -433.0 ± 1.3 kJ/mol 74.0785 ± 79-09-4*2 Methylaminilium [CH3NH]+ (g) 1135.2 1125.4 ± 2.1 kJ/mol 30.04865 ± 49784-84-1*0 (1Z)-Ethanimine CH3CHNH (g, cis) 58.9 44.2 ± 1.4 kJ/mol 43.0678 ± 56003-82-8*0 (E)-2-Iminoethylium [CH2CHNH]+ (g, anti-singlet) 1108.3 1097.6 ± 2.9 kJ/mol 42.0594 ± 91127-33-2*22 2-Iminoethyl anion [CH2CHNH]- (g, syn) 104.5 93.5 ± 2.1 kJ/mol 42.0604 ± 73843-87-5*1 Ammonium chloride (NH4)Cl (cr) -311.555 -314.717 ± 0.062 kJ/mol 53.49120 ± 12125-02-9*510 Ammonium bromide (NH4)Br (cr) -253.27 -269.84 ± 0.14 kJ/mol 97.9425 ± 12124-97-9*510 1-Propenylidene CH3CHC (g, triplet) 630.5 623.0 ± 1.7 kJ/mol 40.0639 ± 70277-78-0*2 Cyanogen cation [NCCN]+ (g) 1598.23 1600.45 ± 0.42 kJ/mol 52.0343 ± 37354-81-7*0 Isocyanogen CNCN (g) 412.1 414.4 ± 1.3 kJ/mol 52.0349 ± 83951-85-3*0 Diazoethenylidene NNCC (g) 658.6 661.2 ± 1.8 kJ/mol 52.0349 ± 130760-10-0*0 Isocyanomethyliumylidene [CNC]+ (g) 1615.7 1621.2 ± 1.9 kJ/mol 38.0276 ± 78271-45-1*0 Isocyanomethylidyne anion [CNC]- (g) 479.2 482.9 ± 2.0 kJ/mol 38.0287 ± *53590-27-5*0 Cyanomethyliumylidene [CCN]+ (g) 1719.7 1725.3 ± 2.1 kJ/mol 38.0276 ± 76619-90-4*0 Cyanomethylidyne anion [CCN]- (g) 410.0 413.7 ± 2.2 kJ/mol 38.0287 ± 12373-35-2*0 2,3-didehydro-1H-azirin-1-yl N(CC) (g) 720.3 724.3 ± 2.1 kJ/mol 38.0281 ± 439586-06-8*0 Hydrogen fluoride HF (aq, 5 H2O) -321.319 ± 0.099 kJ/mol 20.006343 ± 7664-39-3*809 Diazirinyl HC(NN) (g, 2A') 557.1 553.9 ± 2.0 kJ/mol 41.03212 ± 69967-71-1*2 Aminooxy anion [NH2O]- (g) 47.3 40.4 ± 1.7 kJ/mol 32.02257 ± 51375-41-8*0 Iminomethylimidogen anion [NCHN]- (g, singlet) 401.9 398.6 ± 2.3 kJ/mol 41.03267 ± 150296-30-3*2 1H-Diazirin-3-ylium [HN(NC)]+ (g, singlet) 1527.2 1523.7 ± 2.0 kJ/mol 41.03157 ± 735234-64-7*2 1H-Diazirin-3-yl HN(NC) (g, quartet) 917.7 914.3 ± 1.9 kJ/mol 41.03212 ± 324529-57-9*2 1H-diazirin-3-ide [HN(NC)]- (g, singlet) 379.8 376.6 ± 2.0 kJ/mol 41.03267 ± *735234-64-7*2 Cyanogen bromide anion [BrCN]- (g) 57.9 54.3 ± 3.8 kJ/mol 105.9220 ± 54092-05-6*0 Methanediimine cation [HNCNH]+ (g, cis) 1137.8 1133.1 ± 2.2 kJ/mol 42.03951 ± 1189338-16-6*2 Diazomethane cation [CH2NN]+ (g) 1141.92 1135.65 ± 0.87 kJ/mol 42.03951 ± 58852-13-4*0 3H-Diazirine cation [CH2(NN)]+ (g) 1327.5 1322.0 ± 1.7 kJ/mol 42.03951 ± 796039-16-2*0 Tribromide [Br3]- (g) -287.4 -308.5 ± 1.9 kJ/mol 239.7125 ± 14522-80-6*0 1H-Diazirene cation [CH(NHN)]+ (g) 1333.3 1326.3 ± 1.9 kJ/mol 42.03951 ± *157-23-3*0 Isocyanamide cation [NH2NC]+ (g) 1321.4 1316.1 ± 1.9 kJ/mol 42.03951 ± 160951-17-7*0 Methyliumylamino [CH2NH]+ (g) 1056.0 1049.2 ± 1.7 kJ/mol 29.04071 ± 65130-65-6*0 3-Diaziridinylidene cation [C(NHNH)]+ (g, anti) 1479.7 1473.7 ± 2.4 kJ/mol 42.03951 ± *85513-79-7*1 Trichloromethylium [CCl3]+ (g) 856.12 854.61 ± 0.93 kJ/mol 118.3683 ± 27130-34-3*0 Dichloromethyliumyl [CCl2]+ (g) 1121.9 1122.9 ± 1.8 kJ/mol 82.9156 ± 55945-51-2*0 Methylammoniumyl [CH3NH2]+ (g) 865.98 852.05 ± 0.25 kJ/mol 31.05659 ± 34516-31-9*0 Methylamine anion [CH3NH2]- (g) 84.2 69.4 ± 2.8 kJ/mol 31.05769 ± 81096-79-9*0 Hypofluorous acid cation [HOF]+ (g) 1142.01 1139.00 ± 0.87 kJ/mol 36.00519 ± 90243-22-4*0 Dinitrogen pentoxide O2NONO2 (cr,l) -41.15 ± 0.38 kJ/mol 108.0105 ± 10102-03-1*500 Nitrate [ON(O)O]- (aq) -206.55 ± 0.18 kJ/mol 62.00549 ± 14797-55-8*800 Fluorosyl fluoride cation [FFO]+ (g, quartet) 1413.1 1413.4 ± 3.5 kJ/mol 53.99566 ± *86825-50-5*1 2-Chloro ozone anion [ClO(O)O]- (g) -103.6 -105.9 ± 3.2 kJ/mol 83.4514 ± *141801-67-4*0 1,1,1-Trichloroethane CH3CCl3 (l) -183.86 -177.21 ± 0.52 kJ/mol 133.4033 ± 71-55-6*500 Methanol anion [CH3OH]- (g) -89.0 -99.7 ± 2.8 kJ/mol 32.04241 ± 68474-04-4*0 Azanidylmethyl [CH2NH]- (g) 224.4 217.1 ± 2.2 kJ/mol 29.04181 ± 127593-73-1*0 Fluoroaminyliumyl [NF]+ (g) 1415.09 1415.63 ± 0.85 kJ/mol 33.004595 ± 33146-36-0*0 Vinyl chloride CH2CHCl (cr,l) -3.61 0.96 ± 0.91 kJ/mol 62.4979 ± 75-01-4*500 2-Propenylidyne anion [CH2CHC]- (g) 464.6 460.9 ± 1.7 kJ/mol 39.0565 ± 120126-89-8*0 Chloromethane cation [CH3Cl]+ (g) 1014.61 1007.84 ± 0.17 kJ/mol 50.4867 ± 12538-71-5*0 1,2-Propadien-1-yl-3-ylidene anion [CCC]- (g) 621.7 629.1 ± 1.3 kJ/mol 36.0326 ± 109292-47-9*0 Bromofluoromethane CH2FBr (g) -197.4 -211.9 ± 4.9 kJ/mol 112.9290 ± 373-52-4*0 2-Cyclopropyn-1-ylidene C(CC) (g, singlet) 993.1 999.9 ± 2.6 kJ/mol 36.0321 ± 102508-15-6*2 Fluorodibromomethane CHFBr2 (g) -159.7 -179.3 ± 4.9 kJ/mol 191.8250 ± 1868-53-7*0 2-Propen-3-yliumylidene [CHCHCH]+ (g) 1494.5 1491.5 ± 1.7 kJ/mol 39.0554 ± 84654-86-4*0 Difluorochlorobromomethane CF2ClBr (g) -428.9 -439.9 ± 4.9 kJ/mol 165.3642 ± 353-59-3*0 Dichlorofluorobromomethane CCl2FBr (g) -228.3 -238.3 ± 4.9 kJ/mol 181.8185 ± 353-58-2*0 Dibromofluorochloromethane CBr2FCl (g) -169.9 -186.8 ± 4.9 kJ/mol 226.2698 ± 353-55-9*0 Krypton cation Kr+ (g) 1350.756 1350.756 ± 0.000 kJ/mol 83.7995 ± 16915-28-9*0 Hydrooxonitrate [HNO]- (g) 78.60 75.68 ± 0.99 kJ/mol 31.01463 ± 66057-02-1*0 2-Propenylidene anion [CHCHCH]- (g) 535.9 532.6 ± 1.7 kJ/mol 39.0565 ± 98705-30-7*0 Triazirinylium ion [N(NN)]+ (g) 1609.0 1606.1 ± 1.6 kJ/mol 42.01967 ± 92220-05-8*0 Hydroxyimidogen anion [NOH]- (g) 229.8 227.4 ± 2.2 kJ/mol 31.01463 ± *35337-59-8*0 2-Cyclopropyn-1-yl anion [C(CC)]- (g) 664.5 671.8 ± 1.6 kJ/mol 36.0326 ± 500574-36-7*0 1,2-Difluoroacetylene cation [FCCF]+ (g) 1081.6 1084.4 ± 1.3 kJ/mol 62.0177 ± 268566-70-7*0 Difluorophosgene cation [CF2O]+ (g) 653.44 650.68 ± 0.51 kJ/mol 66.00636 ± 73256-56-1*0 Formaldehyde anion [CH2O]- (g) -26.7 -28.3 ± 2.0 kJ/mol 30.02653 ± 27837-46-3*0 Chloro(chlorooxy)methylene ClCOCl (g, cis) 73.5 73.7 ± 3.6 kJ/mol 98.9155 ± 479587-31-0*2 Chlorohydroxymethylene ClCOH (g, trans) 14.0 11.1 ± 2.5 kJ/mol 64.4707 ± 147723-60-2*1 (Chlorooxy)methylene HCOCl (g, cis) 119.2 117.9 ± 2.7 kJ/mol 64.4707 ± 331419-80-8*2 Dibromophosgene CBr2O (l) -143.98 ± 0.95 kJ/mol 187.8181 ± 593-95-3*590 Triazirine HN(NN) (g) 464.2 457.7 ± 2.6 kJ/mol 43.02816 ± 157-29-9*0 2-Chloroethanol ClCH2CH2OH (l) -314.90 ± 0.53 kJ/mol 80.5132 ± 107-07-3*590 2-Bromoethanol BrCH2CH2OH (l) -274.38 ± 0.46 kJ/mol 124.9645 ± 540-51-2*590 Water H2O (l, eq.press.) -285.806 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*589 Phenylium [C6H5]+ (g, singlet) 1149.28 1136.50 ± 0.85 kJ/mol 77.1034 ± 17333-73-2*2 Aminomethyliumyl [CHNH2]+ (g) 1039.5 1031.8 ± 2.3 kJ/mol 29.04071 ± 89302-94-3*0 Propynylidene HCCCH (g) 543.70 546.70 ± 0.58 kJ/mol 38.0480 ± 67152-18-5*0 Chlorine difluoride cation [ClFF]+ (g) 1346.3 1344.9 ± 2.1 kJ/mol 73.44896 ± 86825-59-4*0 Hydroxyoxoammoniumyl [HONO]+ (g) 984.1 977.7 ± 1.8 kJ/mol 47.01293 ± 80371-48-8*0 m-Benzyne anion [C6H4]- (g) 444.5 435.6 ± 1.3 kJ/mol 76.0965 ± 249589-31-9*0 p-Benzyne anion [C6H4]- (g) 465.1 455.5 ± 1.3 kJ/mol 76.0965 ± 219298-17-6*0 Formaldehyde CH2O (g, triplet) 196.008 192.706 ± 0.094 kJ/mol 30.02598 ± 50-00-0*1 Cycloheptane CH2(CH2CH2CH2CH2CH2CH2) (cr,l) -126.57 -156.46 ± 0.50 kJ/mol 98.1861 ± 291-64-5*500 Ethylbenzene C6H5CH2CH3 (cr,l) -12.32 ± 0.52 kJ/mol 106.1650 ± 100-41-4*500 Phenylacetylene C6H5CCH (cr,l) 273.84 ± 0.70 kJ/mol 102.1332 ± 536-74-3*500 Tetranitrogen cation [NNNN]+ (g) 1392.8 1392.5 ± 1.5 kJ/mol 56.02641 ± 12185-04-5*0 Indane C6H4(CH2CH2CH2) (cr,l) 25.40 10.92 ± 0.76 kJ/mol 118.1757 ± 496-11-7*500 Indene cation [C6H4(CHCHCH2)]+ (g) 969.94 946.70 ± 0.73 kJ/mol 116.1593 ± 42949-13-3*0 Indene C6H4(CHCHCH2) (cr,l) 117.22 109.93 ± 0.85 kJ/mol 116.1598 ± 95-13-6*500 Phenyloxoniumylidene [C6H5O]+ (g) 898.7 884.4 ± 1.4 kJ/mol 93.1028 ± 41071-17-4*0 Hydrogen chloride HCl (aq, 1000 H2O) -166.563 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*839 Hydrogen chloride HCl (aq, 1250 H2O) -166.604 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*954 3-Methanetetrayl-1,2-cyclopropanediylidene CC(CC) (g) 1154.7 1164.1 ± 1.9 kJ/mol 48.0428 ± 78015-08-4*0 Fluorobenzene C6H5F (cr,l) -148.77 -146.36 ± 0.39 kJ/mol 96.1023 ± 462-06-6*500 1-Cyclopropene-1,2-diyl CH2(CC) (g) 791.2 790.7 ± 1.5 kJ/mol 38.0480 ± 202744-75-0*0 2-Cyclopropyn-1-ylidenemethyl anion [CC(CC)]- (g) 800.8 809.7 ± 1.7 kJ/mol 48.0433 ± 289679-90-9*0 Aminomethylene anion [CHNH2]- (g) 353.0 346.1 ± 2.3 kJ/mol 29.04181 ± 207914-86-1*0 Bromobenzene C6H5Br (cr,l) 60.3 ± 1.3 kJ/mol 157.0079 ± 108-86-1*500 Pyridinium [NH(CHCHCHCHCH)]+ (g) 761.7 740.8 ± 1.3 kJ/mol 80.1073 ± 16969-45-2*0 Acetone CH3C(O)CH3 (cr,l) -244.54 -247.66 ± 0.26 kJ/mol 58.0791 ± 67-64-1*500 2-Hydroxy-2-propenyl CH2C(OH)CH2 (g) 4.0 -9.5 ± 1.2 kJ/mol 57.0712 ± 742072-56-6*0 Propionaldehyde CH3CH2CHO (cr,l) -217.92 -216.46 ± 0.24 kJ/mol 58.0791 ± 123-38-6*500 Ethyl nitrite CH3CH2ONO (g) -81.16 -98.56 ± 0.87 kJ/mol 75.0666 ± 109-95-5*0 Hydrogen bromide HBr (aq, 600 H2O) -120.01 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*834 trans-1,2-Dibromoethene CHBrCHBr (g, trans) 121.8 102.0 ± 2.0 kJ/mol 185.8453 ± 590-12-5*0 1,1-Dibromoethene CH2CBr2 (g) 125.7 105.3 ± 2.1 kJ/mol 185.8453 ± 593-92-0*0 Monoammonium succinate (CH2C(O)OH)2(NH3) (cr) -1067.87 ± 0.72 kJ/mol 135.1186 ± 38457-08-8*510 Diammonium succinate (CH2COOH)2(NH3)2 (cr) -1182.38 ± 0.47 kJ/mol 152.1492 ± 2226-88-2*510 Cyclopropenyliumdiyl [CH(CC)]+ (g) 1692.3 1695.2 ± 1.8 kJ/mol 37.0395 ± 127476-05-5*0 Acrolein CH2CHCHO (g, cis) -46.3 -56.7 ± 1.3 kJ/mol 56.0633 ± 107-02-8*2 Chloroniumyl ion [HCl]+ (g) 1137.798 1137.732 ± 0.0051 kJ/mol 36.46009 ± 12258-94-5*0 2H-Oxete O(CH2CHCH) (g) 65.8 53.3 ± 1.2 kJ/mol 56.0633 ± 287-25-2*0 Hydroperoxyimidogen HOON (g, trans) 103.3 99.8 ± 2.4 kJ/mol 47.01348 ± 877456-58-1*1 Cyclopropynyl anion [CH(CC)]- (g) 518.36 521.35 ± 0.76 kJ/mol 37.0406 ± 136861-42-2*0 1-Formylethenylium [CH2CCHO]+ (g, singlet) 1023.5 1018.0 ± 2.3 kJ/mol 55.0548 ± 101705-89-9*2 3-Oxo-1-propenylium [CHCHCHO]+ (g, singlet) 1005.1 1002.8 ± 2.4 kJ/mol 55.0548 ± 101705-90-2*2 Ethenedione cation [OCCO]+ (g) 909.5 912.6 ± 2.0 kJ/mol 56.0197 ± 12541-99-0*0 Hydrogen chloride HCl (aq, 1500 H2O) -166.635 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*840 Ozone cation [OOO]+ (g) 1352.880 1350.541 ± 0.041 kJ/mol 47.99765 ± 12596-82-6*0 Diazenium [NH2NH]+ (g) 968.67 957.41 ± 0.73 kJ/mol 31.03675 ± 37369-93-0*0 Ethanium [C2H7]+ (g, classical Cs I) 888.7 870.3 ± 1.8 kJ/mol 31.0764 ± 24669-33-8*2 Nitric acid cation [HON(O)O]+ (g) 1029.17 1020.11 ± 0.69 kJ/mol 63.01233 ± 272109-63-4*0 Hydrogen fluoride HF (aq, 40 H2O) -321.93 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*821 3-Imino-2-propen-1-ylidene CHCHCNH (g, anti-singlet) 533.0 527.9 ± 1.8 kJ/mol 53.0627 ± 916765-05-4*12 3-Imino-2-propen-1-ylidene CHCHCNH (g, syn-triplet) 572.6 567.3 ± 2.0 kJ/mol 53.0627 ± 916765-05-4*22 2-(Methylidyneamino)ethenyl CHCHNCH (g, syn-singlet) 604.5 599.7 ± 1.9 kJ/mol 53.0627 ± 123416-74-0*12 2-(Methylidyneamino)ethenyl CHCHNCH (g, syn-triplet) 637.1 632.3 ± 2.0 kJ/mol 53.0627 ± 123416-74-0*22 Ethanium [C2H7]+ (g, classical Cs II) 895.1 877.3 ± 1.9 kJ/mol 31.0764 ± 24669-33-8*3 Tribromine Br3 (g) 156.0 134.3 ± 3.2 kJ/mol 239.7120 ± 11094-39-6*0 1-Cyanovinylium [CH2CCN]+ (g) 1318.3 1317.1 ± 2.2 kJ/mol 52.0542 ± 85399-09-3*0 Nitrosyl nitrate ONONO2 (g, trans) 48.3 40.3 ± 1.8 kJ/mol 92.0111 ± 15969-55-8*1 Trioxidanylium [HOOO]+ (g) 1070.7 1064.5 ± 1.4 kJ/mol 49.00559 ± 74241-49-9*0 Dioxodiazoxane ONONO (g, t, c) 109.3 105.3 ± 1.8 kJ/mol 76.01168 ± 122413-35-8*2 Chlorosyl chloride anion [ClClO]- (g) -185.4 -184.7 ± 2.3 kJ/mol 86.9053 ± *86825-55-0*0 Tetraoxygen O4 (g, C2h singlet) 145.8 142.2 ± 3.8 kJ/mol 63.9976 ± 12596-83-7*22 Butatriene cation [CH2CCCH2]+ (g) 1210.6 1204.7 ± 1.3 kJ/mol 52.0740 ± 65513-85-1*0 Bicyclo[1.1.0]but-3-ene CH2(CCH)CH (g) 483.2 474.2 ± 1.6 kJ/mol 52.0746 ± 78525-41-4*0 Vinylvinylidene anion [CH2CHCHC]- (g, trans) 405.7 399.0 ± 2.0 kJ/mol 52.0751 ± 167386-49-4*1 Tetrahedrane cation [CH(CH(CHCH))]+ (g) 1326.8 1318.6 ± 1.7 kJ/mol 52.0740 ± 80826-01-3*0 Bicyclo[1.1.0]but-1(3)-ene CH2(CC)CH2 (g) 578.8 570.4 ± 1.9 kJ/mol 52.0746 ± 58208-49-4*0 Bicyclo[1.1.0]but-1(3)-ene cation [CH2(CC)CH2]+ (g) 1461.6 1453.5 ± 2.1 kJ/mol 52.0740 ± *58208-49-4*0 Nitric acid HON(O)O (aq, 1 H2O) -186.82 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*801 Nirous oxide anion [NNO]- (g) 99.3 96.7 ± 1.9 kJ/mol 44.01343 ± 12274-12-3*0 1-Buten-3-yn-1-yl HCCCHCH (g, cis) 547.9 545.1 ± 1.2 kJ/mol 51.0666 ± 2810-61-9*2 Hydrogen bromide HBr (aq, 1250 H2O) -120.15 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*954 Chloryl chloride ClCl(O)O (g) 126.1 122.1 ± 1.7 kJ/mol 102.9042 ± 117489-73-3*0 3-Buten-1-ynylium [CH2CHCC]+ (g, singlet) 1603.9 1602.9 ± 1.7 kJ/mol 51.0661 ± 103928-84-3*2 Nitric acid HON(O)O (aq, 3 H2O) -197.76 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*805 3-Methylene-1-cyclopropen-1-ylium [CH2C(CHC)]+ (g, triplet) 1467.7 1464.0 ± 1.6 kJ/mol 51.0661 ± 117469-28-0*1 2-Cyclopropen-1-ylidenemethylium [CHC(CHCH)]+ (g, singlet) 1346.5 1343.9 ± 1.8 kJ/mol 51.0661 ± 112936-36-4*2 1,3-Cyclobutadien-1-ylium [C(CHCHCH)]+ (g, singlet) 1388.3 1383.4 ± 1.8 kJ/mol 51.0661 ± 81913-77-1*2 Cyanic azide NCNNN (g) 502.8 498.3 ± 1.9 kJ/mol 68.03766 ± 764-05-6*0 2-Butynylium [CH3CCCH2]+ (g, triplet) 1258.7 1251.5 ± 1.6 kJ/mol 53.0820 ± 64235-83-2*1 Phenyl hydroperoxide C6H5OOH (g) 13.8 -5.2 ± 2.1 kJ/mol 110.1106 ± 36112-26-2*0 Hydrogen fluoride HF (aq, 18 H2O) -321.82 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*901 trans-1,3,5-Hexatriene CH2CHCHCHCHCH2 (g, trans) 184.0 164.2 ± 2.4 kJ/mol 80.1277 ± 821-07-8*0 Methylcyclopentadienyl CH3C(CHCHCHCH) (g) 239.0 221.4 ± 2.1 kJ/mol 79.1198 ± 72348-44-8*0 Methylcyclopentane CH3CH(CH2CH2CH2CH2) (cr,l) -116.56 -137.92 ± 0.35 kJ/mol 84.1595 ± 96-37-7*500 Dioxosilane SiO2 (cr, cristobalite) -904.07 -908.93 ± 0.68 kJ/mol 60.08430 ± 7631-86-9*510 1-Methylene-2-propenylium [CH2CHCCH2]+ (g, singlet) 1059.5 1049.3 ± 1.7 kJ/mol 53.0820 ± 62698-26-4*2 1-Methylene-2-propenylium [CH2CHCCH2]+ (g, triplet) 1256.4 1246.7 ± 1.7 kJ/mol 53.0820 ± 62698-26-4*1 Fluorosilylidyne SiF (g) -60.32 -58.48 ± 0.62 kJ/mol 47.08390 ± 11128-24-8*0 Deuterium hydride cation [HD]+ (g) 1490.498 1490.587 ± 0.000 kJ/mol 3.021493 ± 12181-16-7*0 Ethylene anion [CH2CH2]- (g, syn ?) 231.6 225.5 ± 2.0 kJ/mol 28.0537 ± 34527-91-8*2 Silylene anion [SiH2]- (g) 167.2 165.6 ± 1.4 kJ/mol 30.10193 ± 54991-62-7*0 Silyliumylidene [SiH]+ (g) 1136.49 1137.70 ± 0.80 kJ/mol 29.09289 ± 31241-66-4*0 Disilene cation [SiH2SiH2]+ (g) 1069.5 1060.4 ± 2.0 kJ/mol 60.20221 ± 108492-63-3*0 Di-mu-hydrodihydrodisilicon cation [HSi(HSiHH)]+ (g, trans) 1180.3 1172.7 ± 3.2 kJ/mol 60.20221 ± *129970-82-7*1 Di-mu-hydrodihydrodisilicon anion [HSi(HSiHH)]- (g, trans) 288.5 280.0 ± 3.3 kJ/mol 60.20331 ± *129970-83-8*1 mu-Hydrotrihydrodisilicon Si(HSiH3) (g, triplet) 459.2 450.9 ± 2.5 kJ/mol 60.20276 ± 497967-55-2*1 Vinylsilane CH2CHSiH3 (g) 107.9 92.5 ± 2.2 kJ/mol 58.1545 ± 7291-09-0*0 1-Ethylium-1-yl [CH3CH]+ (g) 1182.0 1174.7 ± 3.2 kJ/mol 28.0526 ± 85944-79-2*0 1,3-Butadienylium [CH2CHCHCH]+ (g, singlet) 1133.7 1123.7 ± 2.5 kJ/mol 53.0820 ± 86181-69-3*2 Chlorosyl chloride cation [ClClO]+ (g) 1132.6 1130.8 ± 2.0 kJ/mol 86.9043 ± *86825-56-1*0 Hydrogen bromide HBr (aq, 5000 H2O) -120.31 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*844 Ethylidene anion [CH3CH]- (g) 325.7 318.4 ± 1.8 kJ/mol 28.0537 ± 35829-99-3*0 Methylimidogen anion [CH3N]- (g) 321.1 313.4 ± 1.3 kJ/mol 29.04181 ± 82539-34-2*0 Dewar benzene (CHCH)(CHCHCHCH) (g) 422.2 405.1 ± 1.7 kJ/mol 78.1118 ± 5649-95-6*0 1,2-Hexadien-4-yne CH2CCHCCCH3 (g) 407.5 397.5 ± 1.7 kJ/mol 78.1118 ± 34783-10-3*0 3-Methylene-1-penten-4-yne CH2CHC(CH2)CCH (g, trans) 362.7 350.0 ± 2.2 kJ/mol 78.1118 ± 6929-96-0*1 3-Methyl-1,4-pentadiyne HCCCH(CH3)CCH (g) 439.1 427.7 ± 1.6 kJ/mol 78.1118 ± 57242-04-3*0 Hydrogen fluoride HF (aq, 60 H2O) -321.97 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*823 Ethylaminylium [CH3CH2NH]+ (g, syn-triplet) 1092.4 1076.4 ± 2.4 kJ/mol 44.0752 ± 54387-08-5*11 2-Methyl-2-propanamine (CH3)3CNH2 (cr,l) -133.13 -150.61 ± 0.53 kJ/mol 73.1369 ± 75-64-9*500 1,2-Diphenylethane C6H5CH2CH2C6H5 (cr,l) 84.79 51.04 ± 0.75 kJ/mol 182.2610 ± 103-29-7*500 Anthracene C6H4(CH(CC(C4H4)CH)) (cr,l) 150.62 124.81 ± 0.88 kJ/mol 178.2292 ± 120-12-7*500 Chlorine difluoride anion [ClFF]- (g) -319.0 -319.0 ± 2.2 kJ/mol 73.45005 ± 91419-41-9*0 Phenanthrene C6H4(C2H2(CC(C4H4))) (cr,l) 136.27 110.99 ± 0.64 kJ/mol 178.2292 ± 85-01-8*500 Diphenylacetylene C6H5CCC6H5 (g) 432.3 407.3 ± 1.2 kJ/mol 178.2292 ± 501-65-5*0 Diphenylacetylene C6H5CCC6H5 (cr,l) 334.65 312.70 ± 0.93 kJ/mol 178.2292 ± 501-65-5*500 iso-Proplylide [CH3CHCH3]- (g) 128.8 110.4 ± 1.5 kJ/mol 43.0882 ± 25012-80-0*0 Benzophenone C6H5C(O)C6H5 (cr,l) -16.7 -42.0 ± 1.5 kJ/mol 182.2179 ± 119-61-9*500 Fluorosyl fluoride anion [FFO]- (g, quartet) -56.6 -55.7 ± 2.4 kJ/mol 53.99675 ± *86825-57-2*1 Bicyclo[1.1.0]buta-1,1-diene-2,4-diyl C(CCH)C (g) 990.4 993.6 ± 2.0 kJ/mol 49.0507 ± *99417-53-5*0 Benzoic acid C6H5C(O)OH (g) -274.34 -294.14 ± 0.19 kJ/mol 122.1213 ± 65-85-0*0 Propylene cation [CH3CHCH2]+ (g) 975.18 961.65 ± 0.18 kJ/mol 42.0792 ± 34504-10-4*0 Argonium [ArH]+ (g) 1151.8 1150.1 ± 1.4 kJ/mol 40.9554 ± 12254-68-1*0 Xenonium [XeH]+ (g) 1038.19 1036.42 ± 0.88 kJ/mol 132.2974 ± 37276-91-8*0 Hydrogen carbonate [HOC(O)O]- (aq) -689.868 ± 0.039 kJ/mol 61.0174 ± 71-52-3*800 Sulfur dioxide OSO (aq, undissoc) -320.69 ± 0.14 kJ/mol 64.0648 ± 7446-09-5*1000 Sulfur oxide peroxide OSOO (g, cis) -26.0 -30.2 ± 2.3 kJ/mol 80.0642 ± 175799-68-5*2 Trisulfide [SSS]- (g) -83.72 -84.65 ± 0.71 kJ/mol 96.1985 ± 12597-04-5*0 Peroxychloric acid HOOCl(O)O (g) 76.6 68.4 ± 2.5 kJ/mol 100.4582 ± 177778-91-5*0 Cyclopentene CH2(CH2CHCHCH2) (l) 7.37 ± 0.48 kJ/mol 68.1170 ± 142-29-0*590 Sulfuric acid OS(O)(OH)2 (aq, 115 H2O) -887.70 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*893 Sulfuric acid OS(O)(OH)2 (aq, 30 H2O) -885.87 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*820 Sulfuric acid OS(O)(OH)2 (aq, 50 H2O) -886.66 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*822 Sulfuric acid OS(O)(OH)2 (aq, 10000 H2O) -900.64 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*850 Triiodine cation [I3]+ (g) 946.1 941.0 ± 4.1 kJ/mol 380.712861 ± 12596-32-6*0 Sulfur tetraoxide OS(O)(O)O (g, singlet Td) -163.6 -169.5 ± 2.9 kJ/mol 96.0636 ± 12772-98-4*22 Dioxoperoxysulfane (O2S)(OO) (g, triplet Cs ?) -295.8 -295.5 ± 2.7 kJ/mol 96.0636 ± *103613-08-7*22 Methanethiol CH3SH (cr,l) -46.76 -44.57 ± 0.44 kJ/mol 48.1085 ± 74-93-1*500 Hydroxydimethylsulfur CH3S(OH)CH3 (g) -19.7 -37.7 ± 2.6 kJ/mol 79.1424 ± 52670-37-8*0 Carbon disulfide SCS (cr,l) 78.23 89.04 ± 0.69 kJ/mol 76.1427 ± 75-15-0*500 Hydrogen atom H (ad, 1 Pt(111)) -22.3 -24.0 ± 1.5 kJ/mol 1.007940 ± 12385-13-6*1000001 Hydrogen atom H (ad, 1 Pt(111) hcp) -17.0 -20.2 ± 5.2 kJ/mol 1.007940 ± 12385-13-6*1003001 Hydrogen atom H (ad, 1 Pt(111) bridge) -14.1 -17.0 ± 8.5 kJ/mol 1.007940 ± 12385-13-6*1004001 Hydrogen atom H (ad, 4 Pt(111) hcp) -30.3 -33.4 ± 7.2 kJ/mol 1.007940 ± 12385-13-6*1003004 Hydrogen atom H (ad, 4 Pt(111) bridge) -28.3 -31.1 ± 7.6 kJ/mol 1.007940 ± 12385-13-6*1004004 Dihydrogen H2 (g, ortho) 1.417 0.019 ± 0.000 kJ/mol 2.01588 ± 1333-74-0*1 1-Propenylium [CH3CHCH]+ (g, cis) 1231.8 1221.5 ± 1.7 kJ/mol 41.0713 ± 50457-58-4*2 1-Propenylide [CH3CHCH]- (g, cis) 204.0 192.7 ± 1.8 kJ/mol 41.0723 ± 65887-20-9*2 Ethylideneoxoniumyloxy [CH3CHOO]+ (g, anti) 950.7 938.2 ± 2.3 kJ/mol 60.0514 ± 1427752-17-7*1 Hydrazine NH2NH2 (cr,l) 57.30 50.73 ± 0.18 kJ/mol 32.04524 ± 302-01-2*500 Hydrogen iodide HI (aq) -56.825 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*800 Trioxirane O(OO) (g) 272.5 269.9 ± 1.3 kJ/mol 47.99820 ± 153851-84-4*0 Formyloxidanyl HC(O)O (g) -125.77 -127.13 ± 0.55 kJ/mol 45.0174 ± 16499-21-1*0 Dioxiranyl HC(OO) (g) 217.3 213.8 ± 2.0 kJ/mol 45.0174 ± 120595-16-6*0 (Z)-Diazene anion [HNNH]- (g, cis) 280.0 273.3 ± 2.0 kJ/mol 30.02991 ± *86631-37-0*0 Isoprene CH2C(CH3)CHCH2 (cr,l) 48.97 ± 0.69 kJ/mol 68.1170 ± 78-79-5*500 Diethyl ether CH3CH2OCH2CH3 (cr,l) -265.32 -277.63 ± 0.75 kJ/mol 74.1216 ± 60-29-7*500 1-Butanol CH3CH2CH2CH2OH (cr,l) -312.84 -327.12 ± 0.21 kJ/mol 74.1216 ± 71-36-3*500 1-Ethenylium-1-yl [CCH2]+ (g) 1507.0 1507.1 ± 2.1 kJ/mol 26.0367 ± 80541-07-7*0 2-Methyl-2-propanol (CH3)3COH (g) -282.1 -312.2 ± 1.9 kJ/mol 74.1216 ± 75-65-0*0 Trihydrogen H(HH) (g, 2p 2A2" Ry) 756.931 754.146 ± 0.015 kJ/mol 3.02382 ± 12184-91-7*2 Glycolaldehyde HC(O)CH2OH (g, anti-anti) -292.1 -304.7 ± 1.7 kJ/mol 60.0520 ± 141-46-8*21 Glycolaldehyde HC(O)CH2OH (g, gauche-anti) -290.5 -302.8 ± 1.7 kJ/mol 60.0520 ± 141-46-8*31 Glycolaldehyde HC(O)CH2OH (g, anti-syn) -283.8 -296.6 ± 1.7 kJ/mol 60.0520 ± 141-46-8*22 Methyl acetate CH3C(O)OCH3 (l) -445.61 ± 0.56 kJ/mol 74.0785 ± 79-20-9*500 Azide [NNN]- (aq) 272.69 ± 0.47 kJ/mol 42.02077 ± 14343-69-2*800 Oxygen atom hexacation [O]+6 (g) 42035.28 42037.14 ± 0.12 kJ/mol 15.99611 ± 14158-22-6*0 Hydrogen fluoride HF (aq, 23 H2O) -321.85 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*903 1-Hydroxy-2-propanone CH3C(O)CH2OH (g, anti-anti) -340.5 -360.3 ± 1.7 kJ/mol 74.0785 ± 116-09-6*21 1-Hydroxy-2-propanone CH3C(O)CH2OH (g, gauche-anti) -338.0 -356.2 ± 1.7 kJ/mol 74.0785 ± 116-09-6*31 1-Hydroxy-2-propanone CH3C(O)CH2OH (g, anti-syn) -329.6 -349.6 ± 1.7 kJ/mol 74.0785 ± 116-09-6*22 Methoxyoxomethyl CH3OCO (g, syn-staggered) -151.7 -160.7 ± 1.5 kJ/mol 59.0440 ± 16481-04-2*2 Ethynylaminylium [HCCNH]+ (g, triplet) 1277.8 1277.4 ± 2.6 kJ/mol 40.0435 ± 103835-08-1*1 Difluorodioxidanium [FOOF]+ (g, trans) 1283.7 1279.2 ± 2.3 kJ/mol 69.99506 ± *7783-44-0*1 Carbon dioxide anion [CO2]- (g) -340.6 -340.1 ± 2.2 kJ/mol 44.01005 ± 14485-07-5*0 Peroxynitrous acid HOONO (g) -5.74 -11.57 ± 0.35 kJ/mol 63.01288 ± 14691-52-2*0 Propionic acid CH3CH2C(O)OH (cr,l) -505.38 -509.53 ± 0.17 kJ/mol 74.0785 ± 79-09-4*500 Ethylene glycol (CH2OH)2 (cr,l) -448.64 -455.16 ± 0.37 kJ/mol 62.0678 ± 107-21-1*500 Dioxiranylidene cation [C(OO)]+ (g) 1409.1 1410.3 ± 2.6 kJ/mol 44.00895 ± *138832-57-2*0 Oxalic acid (C(O)OH)2 (cr) -819.55 -829.64 ± 0.42 kJ/mol 90.0349 ± 144-62-7*500 Dimethylamine (CH3)2NH (l) -42.63 ± 0.58 kJ/mol 45.0837 ± 124-40-3*500 Tetrafluorohydrazine NF2NF2 (g) -13.4 -22.5 ± 1.4 kJ/mol 104.00709 ± 10036-47-2*0 Dioxiranylidene anion [C(OO)]- (g, ?) -110.2 -109.7 ± 3.0 kJ/mol 44.01005 ± *138832-58-3*0 1,3-Propanediyl CH2CH2CH2 (g, triplet C2) 320.3 308.4 ± 1.5 kJ/mol 42.0797 ± 32458-33-6*12 Hydrogen chloride HCl (aq, 2439 H2O) -166.712 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*951 (E)-2-Iminoethylium [CH2CHNH]+ (g, anti-triplet) 1148.7 1138.9 ± 3.3 kJ/mol 42.0594 ± 91127-33-2*12 1-Iminoethylium [CH3CNH]+ (g, singlet) 833.7 823.2 ± 3.0 kJ/mol 42.0594 ± *128365-64-0*2 1-Iminoethanide [CH3CNH]- (g, anti) 185.7 175.3 ± 3.2 kJ/mol 42.0604 ± *128365-65-1*2 1-Iminoethylium [CH3CNH]+ (g, anti-triplet) 1342.2 1333.3 ± 3.9 kJ/mol 42.0594 ± *128365-64-0*12 Hydroxylamine NH2OH (aq, undissoc) -97.1 ± 2.2 kJ/mol 33.02996 ± 7803-49-8*1000 N-Methylenemethaniminium [CH2NCH2]+ (g, singlet) 904.3 893.4 ± 3.1 kJ/mol 42.0594 ± 88333-01-1*2 (Methylimino)methanide [CH3NCH]- (g, trans) 223.0 212.2 ± 3.2 kJ/mol 42.0604 ± *64709-60-0*1 2-Aminoethenylium [CHCHNH2]+ (g, anti triplet) 1110.6 1099.5 ± 2.4 kJ/mol 42.0594 ± 64724-21-6*12 2-Aminoethenyl anion [CHCHNH2]- (g, anti) 230.2 219.3 ± 2.6 kJ/mol 42.0604 ± *64724-21-6*2 Aziridine NH(CH2CH2) (cr,l) 92.34 ± 0.86 kJ/mol 43.0678 ± 151-56-4*500 Chlorine chlorite ClOClO (g, cis) 177.4 175.1 ± 2.2 kJ/mol 102.9042 ± 105206-44-8*2 Nitrogen atom dianion [N]-2 (g) 1062.8 1065.0 ± 2.8 kJ/mol 14.007837 ± 16727-21-2*0 Isocyanic fluoride FNC (g) 300.9 302.7 ± 1.8 kJ/mol 45.01584 ± 16992-26-0*0 2-Aziridinylium [NH(CHCH2)]+ (g, singlet) 1010.9 998.9 ± 3.3 kJ/mol 42.0594 ± *91127-35-4*2 2-Aziridinide [NH(CHCH2)]- (g, anti) 316.2 304.1 ± 3.4 kJ/mol 42.0604 ± 111127-93-6*2 2-Aziridinyl NH(CHCH2) (g, anti) 364.5 352.4 ± 2.1 kJ/mol 42.0599 ± *23838-09-7*2 2-Aziridinylium [NH(CHCH2)]+ (g, anti-triplet) 1304.9 1293.2 ± 4.1 kJ/mol 42.0594 ± *91127-35-4*12 Trimethylamine (CH3)3N (l) -48.32 ± 0.89 kJ/mol 59.1103 ± 75-50-3*500 Dioxymethylidyne cation [COO]+ (g, doublet) 1436.6 1439.0 ± 2.7 kJ/mol 44.00895 ± *791121-04-5*2 Cyanogen anion [NCCN]- (g) 281.5 284.7 ± 2.2 kJ/mol 52.0354 ± 11118-88-0*0 Diisocyanogen cation [CNNC]+ (g, trans) 1825.3 1828.1 ± 3.2 kJ/mol 52.0343 ± *78800-21-2*1 Isodiazene anion [NNH2]- (g) 380.9 374.1 ± 2.1 kJ/mol 30.02991 ± *63986-30-1*0 Methoxymethylene CH3OCH (g, syn singlet) 144.8 134.4 ± 1.4 kJ/mol 44.0526 ± 19527-10-7*22 Cyanoaminyliumyl [NCN]+ (g) 1672.3 1673.7 ± 2.6 kJ/mol 40.02363 ± 316122-03-9*0 Cyanoamidogen anion [NCN]- (g) 211.85 211.77 ± 0.60 kJ/mol 40.02473 ± 189879-95-6*0 Dioxymethylidyne cation [(C)(OO)]+ (g, vdW quartet) 1388.2 1391.7 ± 3.2 kJ/mol 44.00895 ± *791121-04-5*101 Cyanoaminylium [HNCN]+ (g, singlet) 1460.2 1458.0 ± 1.9 kJ/mol 41.03157 ± 205443-18-1*2 Isocyanogen chloride ClNC (g) 314.7 316.3 ± 2.4 kJ/mol 61.4701 ± 75754-69-7*0 Diazomethanide [HCNN]- (g, triplet) 479.7 478.3 ± 1.8 kJ/mol 41.03267 ± 100840-43-5*1 Iodine monochloride ICl (cr) -36.511 -35.537 ± 0.063 kJ/mol 162.35717 ± 7790-99-0*510 Ammonium hydroxide NH4OH (aq, 10000 H2O) -366.25 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*850 Carbon dioxide cation [CO2]+ (g, quartet) 1335.0 1335.5 ± 2.4 kJ/mol 44.00895 ± 12181-61-2*1 1H-Diazirin-3-ylium [HN(NC)]+ (g, triplet) 1640.3 1638.0 ± 2.0 kJ/mol 41.03157 ± 735234-64-7*1 1H-diazirin-3-ide [HN(NC)]- (g, triplet) 655.2 652.0 ± 2.1 kJ/mol 41.03267 ± *735234-64-7*1 1H-Diazirin-3-yl HN(NC) (g) 618.7 615.8 ± 1.6 kJ/mol 41.03212 ± 324529-57-9*0 Cyanamide NH2CN (cr) 59.04 ± 0.52 kJ/mol 42.04006 ± 420-04-2*500 1-Methyl-1-ethylium-1-yl [CH3CCH3]+ (g) 1058.3 1045.7 ± 1.9 kJ/mol 42.0792 ± 121408-19-3*0 Hydronium radical (H2O)(H) (g, vdW) -18.5 -21.5 ± 2.1 kJ/mol 19.02322 ± 12168-76-2*100 Carbon monoxide anion [CO]- (g) 30.0 33.7 ± 2.3 kJ/mol 28.01065 ± 12539-63-8*0 Methylenediazeniumide HCNNH (g) 375.2 368.7 ± 1.9 kJ/mol 42.04006 ± 24153-51-3*0 Methylidynehydrazinium-1-yl [HCNNH]+ (g) 1251.7 1245.8 ± 1.9 kJ/mol 42.03951 ± 160951-16-6*0 (Iminomethyl)imidogen HNCHN (g, anti-triplet) 420.1 413.1 ± 2.9 kJ/mol 42.04006 ± 87570-07-8*11 Diazomethyliumyl [CNN]+ (g) 1639.6 1640.8 ± 3.1 kJ/mol 40.02363 ± 307495-90-5*0 Diazomethylene anion [CNN]- (g) 406.9 407.1 ± 2.4 kJ/mol 40.02473 ± 205498-92-6*0 3H-Diazirin-3-ylidene C(NN) (g) 579.1 579.5 ± 2.7 kJ/mol 40.02418 ± 253308-70-2*0 Isocyanogen bromide BrNC (g) 341.2 335.5 ± 3.5 kJ/mol 105.9214 ± 65997-98-0*0 Carbon monoxide CO (g, triplet) 465.588 469.295 ± 0.026 kJ/mol 28.01010 ± 630-08-0*1 2-Hydroxyethenyl CHCHOH (g, cis-cis) 143.86 137.30 ± 0.99 kJ/mol 43.0446 ± 108665-16-3*11 Chloromethyliumylidene [CCl]+ (g) 1282.7 1285.8 ± 2.4 kJ/mol 47.4629 ± 69773-94-0*0 Chloromethylidyne anion [CCl]- (g) 319.8 323.6 ± 2.5 kJ/mol 47.4639 ± 117129-77-8*0 2-Hydroxyethenyl CHCHOH (g, trans-trans) 147.2 140.9 ± 1.2 kJ/mol 43.0446 ± 108665-16-3*22 2-Hydroxyethenyl CHCHOH (g, cis-trans) 150.6 144.5 ± 1.6 kJ/mol 43.0446 ± 108665-16-3*12 Isocyanogen iodide INC (g) 341.7 341.9 ± 4.9 kJ/mol 152.92191 ± 66004-32-8*0 1-Propynylium [CH3CC]+ (g) 1547.0 1545.1 ± 3.1 kJ/mol 39.0554 ± 24858-94-4*0 Dioxohydrazine ONNO (g, cis) 172.91 171.14 ± 0.14 kJ/mol 60.01228 ± 16824-89-8*2 Dihydrogen fluoride (HF)(H) (g) -56.5 -54.2 ± 1.7 kJ/mol 21.01428 ± 12592-22-2*2 Isocyanogen iodide anion [INC]- (g) 123.0 125.2 ± 9.3 kJ/mol 152.92246 ± *66004-32-8*0 Cycloprop-1-enylium [CH2(CHC)]+ (g) 1502.2 1498.0 ± 2.1 kJ/mol 39.0554 ± 117067-78-4*0 Methylamine CH3NH2 (l) -45.18 ± 0.44 kJ/mol 31.05714 ± 74-89-5*500 Ethynylene C2 (g, triplet) 827.185 833.890 ± 0.082 kJ/mol 24.0214 ± 12070-15-4*1 Hydrogen fluoride HF (aq, 55 H2O) -321.96 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*905 Cycloprop-2-enylide [CH(CHCH)]- (g) 514.8 511.9 ± 2.2 kJ/mol 39.0565 ± 20829-57-6*0 Poly(vinylchloride) CH2CHCl (s, poly) -84.6 -94.0 ± 1.3 kJ/mol 62.4979 ± 9002-86-2*500 1,1-Dichloroethene CH2CCl2 (l) -23.46 ± 0.51 kJ/mol 96.9427 ± 75-35-4*500 1,2-Propadien-1-ylium-1-yl-3-ylidene [CCC]+ (g, lin) 1957.15 1965.02 ± 0.82 kJ/mol 36.0316 ± 118090-85-0*1 Isopropylidene anion [CH3CCH3]- (g) 282.5 268.4 ± 2.0 kJ/mol 42.0803 ± *121408-19-3*0 Dioxygen difluoride OOF2 (g) 75.1 71.6 ± 3.6 kJ/mol 69.99561 ± 183051-89-0*0 Dichloromethane CH2Cl2 (l) -122.72 ± 0.37 kJ/mol 84.9320 ± 75-09-2*590 Chloryl ion [OClO]+ (g) 1100.26 1097.60 ± 0.53 kJ/mol 67.4510 ± 25052-55-5*0 Methanol dimer (CH3OH)2 (g) -398.2 -418.9 ± 1.4 kJ/mol 64.0837 ± 42845-44-3*0 Peroxyhypochlorous acid cation [HOOCl]+ (g, trans) 1030.4 1024.5 ± 2.5 kJ/mol 68.4589 ± *67952-07-2*1 Nitric acid trihydrate (HON(O)O)(H2O)3 (cr,l) -1062.02 -1055.17 ± 0.20 kJ/mol 117.0587 ± 13444-83-2*500 Tribromofluoromethane CBr3F (g) -98.0 -122.0 ± 1.4 kJ/mol 270.7211 ± 353-54-8*0 Tribromochloromethane CBr3Cl (g) 86.7 63.8 ± 1.4 kJ/mol 287.1754 ± 594-15-0*0 Difluoromethylene anion [CF2]- (g) -211.17 -209.99 ± 0.58 kJ/mol 50.00805 ± 66212-40-6*0 Fluoromethylidyne anion [CF]- (g) 200.8 204.3 ± 1.9 kJ/mol 31.00965 ± 33412-12-3*0 Ammonium hydroxide NH4OH (aq, 5000 H2O) -366.31 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*844 Carbon dication [C]+2 (g) 4150.451 4155.597 ± 0.039 kJ/mol 12.00960 ± 16092-61-8*0 Trifluorine F3 (g) 80.9 82.1 ± 2.5 kJ/mol 56.9952096 ± 73455-86-4*0 Ammonium hydroxide NH4OH (aq, 1 H2O) -363.82 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*801 Difluorovinylidene CCF2 (g) 129.4 130.6 ± 2.2 kJ/mol 62.0182 ± 41895-33-4*0 Cyclopropenylidene anion [C(CHCH)]- (g) 544.2 543.8 ± 2.2 kJ/mol 38.0485 ± *16165-40-5*0 Fluoroethynylium [CCF]+ (g) 1536.5 1541.2 ± 2.3 kJ/mol 43.0193 ± 268566-69-4*0 Bromoacetylene HCCBr (g) 282.0 275.5 ± 1.6 kJ/mol 104.9333 ± 593-61-3*0 Hydroxyoxoammoniumyl [HONO]+ (g, trans) 984.1 977.7 ± 1.8 kJ/mol 47.01293 ± 80371-48-8*1 Propane cation [CH3CH2CH3]+ (g) 974.7 954.6 ± 1.7 kJ/mol 44.0951 ± 34479-70-4*0 Peroxyhypochlorous acid anion [HOOCl]- (g, cis quartet) -32.2 -33.9 ± 2.6 kJ/mol 68.4600 ± *67952-08-3*2 Bromosyl bromide BrBrO (g) 180.4 164.6 ± 2.1 kJ/mol 175.8074 ± 68322-97-4*0 Chloro(chlorooxy)methylene ClCOCl (g, trans singlet) 98. 101. ± 15. kJ/mol 98.9155 ± 479587-31-0*11 2,4,5-Trioxa-1,3-diazabicyclo[1.1.1]pentane N(O3)N (g) 602.5 593.3 ± 2.1 kJ/mol 76.01168 ± 224950-18-9*0 Chlorooxomethylium [ClCO]+ (g) 783.7 783.9 ± 2.2 kJ/mol 63.4623 ± 38264-03-8*0 2-Iodoethanol ICH2CH2OH (l) -207.2 ± 2.4 kJ/mol 171.9650 ± 624-76-0*590 1,3-Butadiyne cation [HCCCCH]+ (g) 1440.21 1442.07 ± 0.55 kJ/mol 50.0581 ± 55468-55-8*0 1,3,5-Hexatriynide [CCCCCCH]- (g) 635.6 644.0 ± 2.3 kJ/mol 73.0727 ± 85905-65-3*0 Carbon suboxide cation [OCCCO]+ (g) 928.8 932.3 ± 1.1 kJ/mol 68.0304 ± 151528-67-5*0 Carbon suboxide anion [OCCCO]- (g) -131.2 -127.7 ± 2.5 kJ/mol 68.0314 ± 109362-94-9*0 Benzene anion [C6H6]- (g) 209.1 197.2 ± 1.2 kJ/mol 78.1124 ± 34562-85-1*0 Nitrous acid anion [HONO]- (g, cis) -105.84 -110.46 ± 0.78 kJ/mol 47.01403 ± 256393-36-9*2 Hydraziniumyl [NH2NH2]+ (g) 886.7 873.3 ± 2.0 kJ/mol 32.04469 ± 20771-51-1*0 Ammonium hydroxide NH4OH (aq, 2 H2O) -364.67 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*803 o-Benzyne C6H4 (g, triplet) 625.7 616.4 ± 1.1 kJ/mol 76.0960 ± 462-80-6*1 Bicyclo[1.1.0]buta-1,3-dien-4-ylium-2-yl [C(CC)C]+ (g) 2087.6 2097.4 ± 2.3 kJ/mol 48.0423 ± 289679-91-0*0 m-Benzyne C6H4 (g) 527.4 518.9 ± 1.2 kJ/mol 76.0960 ± 1828-89-3*0 p-Benzyne cation [C6H4]+ (g) 1423.6 1416.3 ± 2.0 kJ/mol 76.0954 ± 121058-09-1*0 p-Benzyne C6H4 (g) 587.0 577.6 ± 1.2 kJ/mol 76.0960 ± 3355-34-8*0 Deuterium hydride HD (g) 0.328 0.319 ± 0.000 kJ/mol 3.022042 ± 13983-20-5*0 Toluene C6H5CH3 (l) 19.78 12.03 ± 0.31 kJ/mol 92.1384 ± 108-88-3*500 Bicyclo[1.1.0]buta-1,3-dien-2-yl anion [C(CC)C]- (g) 803.0 810.7 ± 1.8 kJ/mol 48.0433 ± 289679-89-6*0 Dioxidanyl dimer (HOO)2 (g, triplet) -8.29 -17.86 ± 0.50 kJ/mol 66.0135 ± 240125-82-0*1 Tetrazete N(NNN) (g, D2h) 764.9 759.0 ± 1.8 kJ/mol 56.02696 ± 42851-09-2*0 Paraformaldehyde CH2O (cr, paraformaldehyde) -176.4 ± 1.5 kJ/mol 30.02598 ± 30525-89-4*500 Tetraazatetrahedrane N(N(N)N) (g, Td) 763.7 757.3 ± 1.7 kJ/mol 56.02696 ± 12596-63-3*0 Cyclopentadienylium [CH(CHCHCHCH)]+ (g) 1088.69 1075.82 ± 0.80 kJ/mol 65.0927 ± 29661-18-5*0 Cycloheptene CH2(CHCHCH2CH2CH2CH2) (cr,l) -25.1 -46.2 ± 1.7 kJ/mol 96.1702 ± 628-92-2*500 Cycloheptatriene CH2(CHCHCHCHCHCH) (cr,l) 154.44 145.65 ± 0.92 kJ/mol 92.1384 ± 544-25-2*500 Phenylethene C6H5CHCH2 (cr,l) 104.47 ± 0.47 kJ/mol 104.1491 ± 100-42-5*500 Benzonitrile C6H5CN (cr,l) 161.17 163.53 ± 0.90 kJ/mol 103.1213 ± 100-47-0*500 Isocyanobenzene C6H5NC (g) 320.9 307.1 ± 1.7 kJ/mol 103.1213 ± 931-54-4*0 n-Heptane CH3(CH2)5CH3 (cr,l) -201.49 -223.95 ± 0.44 kJ/mol 100.2019 ± 142-82-5*500 Isoindene C6H4(CHCH2CH) (g) 269.8 246.5 ± 1.9 kJ/mol 116.1598 ± 270-53-1*0 1,3-Butadiynyl anion [CCCC]- (g) 677.2 686.3 ± 1.1 kJ/mol 48.0433 ± 59158-53-1*0 Tetraoxodinitrogen cation [O2NNO2]+ (g) 1030.6 1025.2 ± 2.6 kJ/mol 92.0105 ± 64476-91-1*0 Phenol C6H5OH (cr,l) -146.16 -162.00 ± 0.64 kJ/mol 94.1112 ± 108-95-2*500 Dihydrogen cation [H2]+ (g, ortho) 1489.060 1488.480 ± 0.000 kJ/mol 2.01533 ± 12184-90-6*1 Ammonium hydroxide NH4OH (aq, 3 H2O) -365.13 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*805 Anisole C6H5OCH3 (l) -117.53 ± 0.61 kJ/mol 108.1378 ± 100-66-3*500 Benzaldehyde C6H5C(O)H (cr,l) -85.61 -86.68 ± 0.90 kJ/mol 106.1219 ± 100-52-7*500 Ammonium hydroxide NH4OH (aq, 4 H2O) -365.43 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*807 Acetophenone C6H5C(O)CH3 (cr,l) -139.3 ± 1.1 kJ/mol 120.1485 ± 98-86-2*500 1-Phenylethenol C6H5C(OH)CH2 (g) -8.7 -32.5 ± 2.0 kJ/mol 120.1485 ± 4383-15-7*0 p-Tolualdehyde CH3C6H4C(O)H (cr, l, para) -125.8 ± 1.3 kJ/mol 120.1485 ± 104-87-0*500 o-Tolualdehyde CH3C6H4C(O)H (cr, l, ortho) -118.9 ± 1.1 kJ/mol 120.1485 ± 529-20-4*500 Fluorobenzene anion [C6H5F]- (g) -15.3 -27.1 ± 1.6 kJ/mol 96.1029 ± 34561-55-2*0 2-Cyclopropyn-1-ylidenemethyliumyl [CC(CC)]+ (g) 2239.7 2247.6 ± 2.3 kJ/mol 48.0423 ± 289679-92-1*0 Hexafluorobenzene anion [C6F6]- (g) -992.7 -995.0 ± 3.5 kJ/mol 186.0552 ± 37551-90-9*0 2-Oxo-1-ethylium-1-yl [HCC(O)H]+ (g, anti-quartet) 1289.4 1286.0 ± 2.5 kJ/mol 42.0361 ± 214464-96-7*11 Ammonium hydroxide NH4OH (aq, 50000 H2O) -366.02 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*855 m-Chlorophenylium [C6H4Cl]+ (g) 1161.7 1151.6 ± 2.6 kJ/mol 111.5481 ± 127983-85-1*0 p-Chlorophenylium [C6H4Cl]+ (g) 1149.0 1139.5 ± 2.5 kJ/mol 111.5481 ± 42766-43-8*0 o-Chlorophenylium [C6H4Cl]+ (g) 1168.3 1159.0 ± 2.5 kJ/mol 111.5481 ± 137963-70-3*0 Trifluoroammoniumyl [NF3]+ (g) 1093.4 1087.3 ± 2.3 kJ/mol 71.001401 ± 54384-83-7*0 Oxoethylidene anion [HCC(O)H]- (g, anti-gauche) 86.9 83.6 ± 2.1 kJ/mol 42.0372 ± 106543-38-8*1 2-Propen-3-ylium-1-ylidyne [CHCHC]+ (g) 1791.2 1792.8 ± 2.6 kJ/mol 38.0474 ± 161054-36-0*0 Dioxodiazoxane ONONO (g, c, p) 125.7 120.4 ± 2.1 kJ/mol 76.01168 ± 122413-35-8*3 Iodobenzene cation [C6H5I]+ (g) 1023.59 1008.15 ± 0.99 kJ/mol 204.0078 ± 38406-85-8*0 Propenediylidene anion [CHCHC]- (g) 588.8 590.0 ± 2.3 kJ/mol 38.0485 ± *161054-36-0*0 Nitrobenzene C6H5N(O)O (cr,l) 7.3 ± 1.3 kJ/mol 123.1094 ± 98-95-3*500 Furan O(CHCHCHCH) (cr,l) -62.56 -61.95 ± 0.60 kJ/mol 68.0740 ± 110-00-9*500 Peroxyhypochlorite [ClOO]- (g) -252.78 -251.75 ± 0.34 kJ/mol 67.4520 ± 224299-14-3*0 Pyridine N(CHCHCHCHCH) (cr,l) 102.22 100.19 ± 0.38 kJ/mol 79.0999 ± 110-86-1*500 Oxobromonium [BrO]+ (g) 1140.0 1132.2 ± 1.6 kJ/mol 95.9029 ± 142315-39-7*0 Nitromethane CH3N(O)O (cr,l) -114.10 -112.92 ± 0.40 kJ/mol 61.0401 ± 75-52-5*500 n-Octane CH3(CH2)6CH3 (cr,l) -226.32 -249.44 ± 0.52 kJ/mol 114.2285 ± 111-65-9*500 n-Nonane CH3(CH2)7CH3 (cr,l) -247.66 -274.52 ± 0.47 kJ/mol 128.2551 ± 111-84-2*500 2,2,4-Trimethylpentane (CH3)2CHCH2C(CH3)3 (cr,l) -224.3 -258.7 ± 1.5 kJ/mol 114.2285 ± 540-84-1*500 cis-1,2-Diiodoethene CHICHI (g, cis) 217.44 209.16 ± 0.35 kJ/mol 279.8462 ± 590-26-1*0 trans-1,2-Diiodoethene CHICHI (g, trans) 215.10 207.70 ± 0.35 kJ/mol 279.8462 ± 590-27-2*0 Norbornadiene (CHCH)(CHCH2CH)(CHCH) (l) 206.2 ± 1.6 kJ/mol 92.1384 ± 121-46-0*500 2,3-Butanedione CH3C(O)C(O)CH3 (cr,l) -365.58 ± 0.53 kJ/mol 86.0892 ± 431-03-8*500 Succinic acid (CH2C(O)OH)2 (g) -801.3 -823.4 ± 2.7 kJ/mol 118.0880 ± 110-15-6*0 1,2-Diiodoethane CH2ICH2I (g) 87.84 73.17 ± 0.90 kJ/mol 281.8621 ± 624-73-7*0 1,2-Diiodoethane CH2ICH2I (cr,l) 9.30 ± 0.60 kJ/mol 281.8621 ± 624-73-7*500 Ammonium hydroxide NH4OH (aq, 10 H2O) -366.00 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*815 2-Butanone CH3CH2C(O)CH3 (cr,l) -267.73 -273.22 ± 0.79 kJ/mol 72.1057 ± 78-93-3*500 Chlorodioxidanyl ClOO (g) 100.36 99.27 ± 0.34 kJ/mol 67.4515 ± 17376-09-9*0 n-Decane CH3(CH2)8CH3 (cr,l) -272.91 -300.46 ± 0.75 kJ/mol 142.2817 ± 124-18-5*500 Acrolein cation [CH2CHCHO]+ (g, trans) 920.00 909.86 ± 0.79 kJ/mol 56.0627 ± 84005-05-0*1 Acrolein anion [CH2CHCHO]- (g, cis) -71.8 -81.9 ± 3.1 kJ/mol 56.0638 ± 23555-87-5*2 Acrolein CH2CHCHO (cr,l) -95.59 ± 0.96 kJ/mol 56.0633 ± 107-02-8*500 1-Oxo-2-propenylium [CH2CHCO]+ (g, singlet) 772.8 765.9 ± 3.0 kJ/mol 55.0548 ± 35335-83-2*2 1-Oxo-2-propenide [CH2CHCO]- (g, I, trans) 50.7 46.0 ± 2.6 kJ/mol 55.0559 ± 78944-75-9*1 3-Oxo-1-propenylium [CHCHCHO]+ (g, anti-cis-triplet) 1197.7 1192.0 ± 3.4 kJ/mol 55.0548 ± 101705-90-2*121 Hydrochlorate ion [HCl]- (g) -25.2 -24.2 ± 2.5 kJ/mol 36.46119 ± 63099-75-2*0 Ethenedione anion [OCCO]- (g) -149.7 -147.1 ± 1.7 kJ/mol 56.0207 ± 77783-15-4*0 Urea NH2C(O)NH2 (cr,l) -317.74 -333.34 ± 0.12 kJ/mol 60.05534 ± 57-13-6*500 Trifluoronitrate [NF3]- (g) -246.7 -248.9 ± 2.5 kJ/mol 71.002498 ± 37366-69-1*0 Formamide CH(O)NH2 (cr,l) -251.05 ± 0.28 kJ/mol 45.04066 ± 75-12-7*500 Aminohydroxymethylene NH2COH (g, Cs-triplet) 217.2 208.7 ± 3.0 kJ/mol 45.04066 ± 160720-48-9*11 Perchloryl cation [OCl(O)O]+ (g) 1252.1 1246.4 ± 2.5 kJ/mol 83.4504 ± 23594-88-9*0 Acetamide CH3C(O)NH2 (cr,l) -315.90 ± 0.53 kJ/mol 59.0672 ± 60-35-5*500 Ammonium hydroxide NH4OH (aq, 20 H2O) -366.20 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*818 Oxygen difluoride cation [FOF]+ (g) 1292.10 1289.58 ± 0.66 kJ/mol 53.99566 ± 39432-25-2*0 Hydroxymethoxy CH2(OH)O (g) -159.58 -169.44 ± 0.84 kJ/mol 47.0333 ± 72144-78-6*0 Acrylonitrile CH2CHCN (g, triplet) 446.5 441.1 ± 1.7 kJ/mol 53.0627 ± 107-13-1*2 Acrylonitrile CH2CHCN (cr,l) 146.51 154.17 ± 0.73 kJ/mol 53.0627 ± 107-13-1*500 Isocyanoethene CH2CHNC (g, triplet) 544.2 539.3 ± 1.8 kJ/mol 53.0627 ± 14668-82-7*2 Hydrogen difluoride cation [FHF]+ (g, triplet ?) 1241. 1238. ± 17. kJ/mol 39.004198 ± 126950-54-7*1 1-Isocyanoethylidene CH3CNC (g) 527.9 523.2 ± 1.1 kJ/mol 53.0627 ± *498544-34-6*0 Dioxohydrazine ONNO (g) 172.91 171.14 ± 0.14 kJ/mol 60.01228 ± 16824-89-8*0 1,5-Hexadiene CH2CHCH2CH2CHCH2 (cr,l) 54.54 ± 0.31 kJ/mol 82.1436 ± 592-42-7*500 Ammonium hydroxide NH4OH (aq, 100000 H2O) -365.86 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*861 Hydroxymethyleneoxonium [CH2OOH]+ (g) 792.97 782.84 ± 0.63 kJ/mol 47.0328 ± 77144-12-8*0 Tetraoxidanyl HOOOO (g, cis) 53.0 46.0 ± 5.1 kJ/mol 65.0055 ± 69696-93-1*2 Ethyl hydroperoxide CH3CH2OOH (cr,l) -209. ± 20. kJ/mol 62.0678 ± 3031-74-1*500 Cyclobutane CH2(CH2CH2CH2) (l) 3.87 ± 0.38 kJ/mol 56.1063 ± 287-23-0*590 Nitrosyl nitrite anion [ONONO]- (g, t, t) -103.0 -106.2 ± 2.8 kJ/mol 76.01223 ± *122413-35-8*1 Tetraoxygen O4 (g, C2h triplet) 104.4 102.4 ± 3.5 kJ/mol 63.9976 ± 12596-83-7*11 Acetonitrile CH3CN (cr,l) 40.62 ± 0.22 kJ/mol 41.0520 ± 75-05-8*500 Trioxidanyl HOOO (g) 25.36 23.27 ± 0.13 kJ/mol 49.00614 ± 12500-78-6*0 Nitric acid monohydrate (HON(O)O)(H2O) (cr,l) -479.12 -472.63 ± 0.18 kJ/mol 81.0282 ± 13444-82-1*500 Vinylacetylene CH2CHCCH (cr,l) 266.5 ± 2.1 kJ/mol 52.0746 ± 689-97-4*500 Methylcyclopropane CH3CH(CH2CH2) (l) 1.90 ± 0.59 kJ/mol 56.1063 ± 594-11-6*590 Dihydrogen cation [H2]+ (g, para) 1488.364 1488.480 ± 0.000 kJ/mol 2.01533 ± 12184-90-6*2 Dihydrogen H2 (g, para) -0.000 -0.058 ± 0.000 kJ/mol 2.01588 ± 1333-74-0*2 Vinylvinylidene CH2CHCHC (g, triplet, trans) 690.5 684.4 ± 2.6 kJ/mol 52.0746 ± 148759-16-4*11 Oxygen difluoride anion [FOF]- (g) -202.1 -201.9 ± 2.7 kJ/mol 53.99675 ± *7783-41-7*0 1-Buten-3-ynylium [HCCCHCH]+ (g, cis) 1483.2 1480.6 ± 1.6 kJ/mol 51.0661 ± 84654-85-3*2 2-Cyclopropen-1-ylidenemethylium [CHC(CHCH)]+ (g, triplet) 1433.2 1429.4 ± 1.9 kJ/mol 51.0661 ± 112936-36-4*1 1,3-Cyclobutadien-1-ylium [C(CHCHCH)]+ (g, triplet) 1473.1 1468.5 ± 1.9 kJ/mol 51.0661 ± 81913-77-1*1 1,3-Cyclobutadien-1-yl anion [C(CHCHCH)]- (g) 616.4 611.9 ± 2.1 kJ/mol 51.0672 ± 154675-37-3*0 Triiodine I3 (g) 153.4 149.4 ± 3.6 kJ/mol 380.713410 ± 12596-31-5*0 Cyclobutenylium [CH2(CHCHCH)]+ (g) 1038.7 1025.6 ± 2.8 kJ/mol 53.0820 ± 12316-90-4*0 Butyraldehyde CH3CH2CH2CHO (cr,l) -235.81 -239.34 ± 0.84 kJ/mol 72.1057 ± 123-72-8*500 Ammonium hydroxide NH4OH (aq, 50 H2O) -366.33 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*822 Disilicon cation [Si2]+ (g) 1352.3 1355.9 ± 2.4 kJ/mol 56.17045 ± 12597-36-3*0 Dioxosilane cation [SiO2]+ (g) 946.3 946.2 ± 2.8 kJ/mol 60.08375 ± 59458-81-0*0 Silicate [SiO2]- (g) -477.5 -478.3 ± 2.6 kJ/mol 60.08485 ± 53095-83-3*0 Oxosilicate [SiO]- (g) -106.0 -104.8 ± 2.6 kJ/mol 44.08545 ± 12503-59-2*0 Silicon carbide SiC (cr, beta-cubic) -71.9 -72.9 ± 1.4 kJ/mol 40.09620 ± 409-21-2*502 Fluorosilylidyne anion [SiF]- (g) -139.0 -137.7 ± 1.8 kJ/mol 47.08445 ± 11080-58-3*0 Silane cation [SiH4]+ (g) 1104.7 1097.5 ± 1.6 kJ/mol 32.11671 ± 34826-51-2*0 Silylium [SiH3]+ (g) 989.66 984.08 ± 0.89 kJ/mol 31.10877 ± 41753-67-7*0 Hydrogen difluoride cation [(HF)(F)]+ (g, triplet) 1267.6 1265.4 ± 4.1 kJ/mol 39.004198 ± *126950-54-7*1 Silylidyne anion [SiH]- (g) 250.0 251.2 ± 1.1 kJ/mol 29.09399 ± 68865-96-3*0 Disilanylium [SiH3SiH2]+ (g) 981.5 970.2 ± 2.5 kJ/mol 61.21015 ± 86860-82-4*0 1,2-Butadienylium [CH3CHCCH]+ (g, triplet) 1315.5 1307.5 ± 1.7 kJ/mol 53.0820 ± *65114-67-2*1 1-Disilanylium-1-yl [SiH3SiH]+ (g) 1124.1 1116.5 ± 2.2 kJ/mol 60.20221 ± 108492-64-4*0 Oxadiazirine cation [O(NN)]+ (g) 1509.9 1507.2 ± 2.4 kJ/mol 44.01233 ± *227934-45-4*0 Di-mu-hydrodihydrodisilicon cation [HSi(HSiHH)]+ (g, cis) 1194.4 1184.8 ± 3.4 kJ/mol 60.20221 ± *129970-82-7*2 Di-mu-hydrodihydrodisilicon anion [HSi(HSiHH)]- (g, cis) 296.7 289.2 ± 3.5 kJ/mol 60.20331 ± *129970-83-8*2 Hydrazoic acid cation [HNNN]+ (g) 1333.73 1328.06 ± 0.82 kJ/mol 43.02761 ± 58852-14-5*0 Ammonium hydroxide NH4OH (aq, 100 H2O) -366.37 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*828 Peroxychlorous acid HOOClO (g, anti) 102.7 96.9 ± 2.4 kJ/mol 84.4588 ± 177778-92-6*2 1,3-Butadienylium [CH2CHCHCH]+ (g, triplet) 1255.9 1246.5 ± 2.3 kJ/mol 53.0820 ± 86181-69-3*1 Formic acid HC(O)OH (aq) -425.48 ± 0.45 kJ/mol 46.0254 ± 64-18-6*800 2,4-Hexadiyne CH3CCCCCH3 (cr,l) 319.16 312.80 ± 0.95 kJ/mol 78.1118 ± 2809-69-0*500 Trichlorine Cl3 (g) 125.3 125.8 ± 2.0 kJ/mol 106.3581 ± 11094-65-8*0 Trimethylenecyclopropane (C3)(CH2)3 (g) 454.2 441.4 ± 1.8 kJ/mol 78.1118 ± 3227-90-5*0 3,4-Bis(methylene)cyclobutene CH2(CCHCHC)CH2 (g) 355.6 341.0 ± 1.8 kJ/mol 78.1118 ± 5291-90-7*0 Ammonium hydroxide NH4OH (aq, 500 H2O) -366.39 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*833 1-Ethynylcyclobutene HCCC(CHCH2CH2) (g) 402.3 388.0 ± 1.8 kJ/mol 78.1118 ± 813466-25-0*0 3-Methyl-1,2-pentadien-4-yne CH2CC(CH3)CCH (g) 414.7 403.5 ± 2.2 kJ/mol 78.1118 ± 813466-14-7*0 Carbonate [OC(O)O]-2 (g) -225.3 -228.5 ± 2.5 kJ/mol 60.0100 ± 3812-32-6*0 NON cation [NON]+ (g) 1444.0 1444.2 ± 2.8 kJ/mol 44.01233 ± *227934-46-5*0 NON anion [NON]- (g) 495.3 492.8 ± 2.5 kJ/mol 44.01343 ± *227934-47-6*0 Chlorine hydride oxide HCl(O)(O)O (g) 163.9 154.0 ± 2.4 kJ/mol 84.4588 ± 1027055-52-2*0 1-Ethynyl-2-propyn-1-ylidene HCCCCCH (g, singlet C2v) 787.5 792.5 ± 2.1 kJ/mol 62.0694 ± 882068-94-2*21 1-Ethynyl-2-propyn-1-ylidene HCCCCCH (g, singlet Cs) 796.1 801.0 ± 2.6 kJ/mol 62.0694 ± 882068-94-2*22 1,3-Pentadiyne-1.5-diyl CH2CCCC (g) 783.8 787.3 ± 2.1 kJ/mol 62.0694 ± 117992-81-1*0 1,3-Pentadiyne HCCCCCH3 (cr,l) 385.1 ± 5.0 kJ/mol 64.0853 ± 4911-55-1*500 Penta-1,4-diyn-3-ide [CHCCHCCH]- (g, syn) 443.9 443.2 ± 3.2 kJ/mol 63.0779 ± 553662-77-4*1 Tetrafluorohydrazine cation [NF2NF2]+ (g, trans) 1129.2 1122.5 ± 2.5 kJ/mol 104.00654 ± 37366-75-9*1 1-Aminoethylium [CH3CHNH2]+ (g) 683.3 664.7 ± 2.3 kJ/mol 44.0752 ± *30208-36-7*0 1-Propanamine CH3CH2CH2NH2 (cr,l) -93.78 -101.39 ± 0.40 kJ/mol 59.1103 ± 107-10-8*500 2-Propanamine CH3CH(CH3)NH2 (cr,l) -101.55 -112.16 ± 0.52 kJ/mol 59.1103 ± 75-31-0*500 Hydrogen fluoride HF (aq, 50 H2O) -321.95 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*822 Naphthalene C6H4(C4H4) (cr,l) 94.71 75.12 ± 0.55 kJ/mol 128.1705 ± 91-20-3*500 Carbon dioxide CO2 (aq, undissoc) -412.868 ± 0.018 kJ/mol 44.00950 ± 124-38-9*1000 Biphenyl C6H5C6H5 (cr,l) 121.6 97.1 ± 1.1 kJ/mol 154.2078 ± 92-52-4*500 Biphenyl C6H5C6H5 (cr) 121.6 97.1 ± 1.1 kJ/mol 154.2078 ± 92-52-4*520 Aniline C6H5NH2 (cr,l) 37.27 31.02 ± 0.63 kJ/mol 93.1265 ± 62-53-3*500 Dihelium He2 (g, triplet) 1733.310 1729.576 ± 0.018 kJ/mol 8.0052040 ± 12184-98-4*1 Dihydrohelium cation [HeHH]+ (g) 1467.27 1461.99 ± 0.44 kJ/mol 6.01793 ± 12500-88-8*0 Neon cation Ne+ (g) 2080.662 2080.769 ± 0.000 kJ/mol 20.17915 ± 14782-23-1*0 Pyruvic acid CH3C(O)C(O)OH (cr,l) -588.45 ± 0.73 kJ/mol 88.0621 ± 127-17-3*500 Disulfur cation [S2]+ (g) 1031.48 1032.07 ± 0.32 kJ/mol 64.1315 ± 12597-02-3*0 Hydrazoic acid anion [HNNN]- (g, trans) 309.1 302.8 ± 2.3 kJ/mol 43.02871 ± 203264-98-6*1 Sulfur trioxide OS(O)O (l) -440.87 ± 0.30 kJ/mol 80.0642 ± 7446-11-9*590 Cyclic thiozone S(SS) (g) 168.5 166.7 ± 2.3 kJ/mol 96.1980 ± *12597-03-4*0 Sulfanylium [SH]+ (g) 1148.36 1148.36 ± 0.19 kJ/mol 33.0734 ± 12273-42-6*0 1,3-Dioxolan-2-one C(O)(OCH2CH2O) (cr,l) -581.53 ± 0.36 kJ/mol 88.0621 ± 96-49-1*500 Sulfuric acid OS(O)(OH)2 (aq, 70 H2O) -887.10 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*824 Sulfur hydroxide oxide cation [OHS(O)(O)O]+ (g, eclipsed) 658.6 647.8 ± 3.4 kJ/mol 97.0710 ± *12337-07-4*2 Sulfurous acid S(O)(OH)2 (g) -511.32 -520.82 ± 0.89 kJ/mol 82.0801 ± 7782-99-2*0 Sulfurous acid S(O)(OH)2 (aq, undissoc) -606.50 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*1000 Hydrogen sulfite [OS(OH)O]- (aq, undissoc) -631.84 ± 0.15 kJ/mol 81.0727 ± 15181-46-1*1000 Bicyclo[1.1.1]pentane-1,3-diyl C(CH2)3C (g, triplet) 783.4 766.1 ± 1.8 kJ/mol 66.1011 ± 863892-18-6*1 Sulfur dioxide - hydroxyl complex (OH)(OSO) (g, vdW) -266.0 -268.1 ± 2.2 kJ/mol 81.0721 ± *32750-86-0*100 Sulfate monoanion [OS(O)(O)O]- (g) -736.9 -744.6 ± 2.2 kJ/mol 96.0641 ± 12143-45-2*0 Ammonia anion [NH3]- (g) 94.3 87.3 ± 2.4 kJ/mol 17.03111 ± 37353-00-7*0 Bromoniumyl [HBr]+ (g) 1098.16 1090.31 ± 0.12 kJ/mol 80.9114 ± 12258-64-9*0 Vinylcyclopentadienylium [CH2CHC(CHCHCHCH)]+ (g, singlet) 1076.9 1059.5 ± 3.7 kJ/mol 91.1299 ± 146893-89-2*2 Platinum atom cation Pt+ (g) 1427.8 1428.3 ± 1.7 kJ/mol 195.0775 ± 20561-56-2*0 Platinum dimer Pt2 (g) 823.5 822.5 ± 3.9 kJ/mol 390.1560 ± 12596-95-1*0 Platinum hydride PtH (g) 451.6 450.7 ± 3.8 kJ/mol 196.0859 ± 13966-55-7*0 Platinum hydride cation [PtH]+ (g) 1363.1 1382.3 ± 4.9 kJ/mol 196.0854 ± 87882-39-1*0 Hydrogen atom H (ad, Pt(111)) -37.0 -38.7 ± 1.1 kJ/mol 1.007940 ± 12385-13-6*1000000 Dimethyl carbonate C(O)(OCH3)2 (cr,l) -608.60 ± 0.31 kJ/mol 90.0779 ± 616-38-6*500 Hydrogen atom H (ad, 4 Pt(111)) -33.4 -35.1 ± 1.5 kJ/mol 1.007940 ± 12385-13-6*1000004 Hydrogen peroxide HOOH (cr,l) -193.114 -187.297 ± 0.076 kJ/mol 34.01468 ± 7722-84-1*500 Trioxirane cation [O(OO)]+ (g) 1444.4 1442.2 ± 2.2 kJ/mol 47.99765 ± *153851-84-4*0 Diazomethylium [HCNN]+ (g, singlet) 1458.9 1456.8 ± 2.2 kJ/mol 41.03157 ± 271249-81-1*2 2-Hydroxyethylium [CH2CH2OH]+ (g, gauche) 1024.7 1012.2 ± 2.0 kJ/mol 45.0600 ± 38607-31-7*1 Diazirinylium [HC(NN)]+ (g, singlet) 1384.8 1381.2 ± 2.1 kJ/mol 41.03157 ± 77116-26-8*2 Iminomethylimidogen cation [NCHN]+ (g, triplet) 1677.6 1676.4 ± 2.3 kJ/mol 41.03157 ± *150296-30-3*1 Iminomethylimidogen anion [NCHN]- (g, triplet) 405.3 402.0 ± 2.5 kJ/mol 41.03267 ± 150296-30-3*1 Hydrazine monohydrate (NH2NH2)(H2O) (l) -242.59 ± 0.19 kJ/mol 50.06052 ± 7803-57-8*500 Hydrogen bromide HBr (aq, 2570 H2O) -120.24 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*952 Water H2O (g, para) -238.907 -241.810 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*2 2-Methylpentane CH3CH2CH2CH(CH3)2 (cr,l) -180.18 -203.83 ± 0.73 kJ/mol 86.1754 ± 107-83-5*500 Chlorine atom tetracation [Cl]+4 (g) 12615.5 12617.1 ± 4.6 kJ/mol 35.45051 ± 22541-74-8*0 1-Hydroxyethenylium [CH2COH]+ (g, anti-triplet) 1025.4 1018.3 ± 2.9 kJ/mol 43.0441 ± 41084-89-3*11 Fluorosyl fluoride FFO (g, singlet) 227. 225. ± 21. kJ/mol 53.99621 ± 86825-57-2*2 (Iminomethyl)imidogen HNCHN (g, triplet) 420.1 413.2 ± 2.9 kJ/mol 42.04006 ± 87570-07-8*1 Hypoiodous acid HOI (aq, undissoc) -146.9 ± 4.9 kJ/mol 143.91181 ± 14332-21-9*1000 Carbon monoxide CO (g, singlet) -113.794 -110.514 ± 0.026 kJ/mol 28.01010 ± 630-08-0*2 Isocyanogen bromide anion [BrNC]- (g) 105.1 101.9 ± 4.6 kJ/mol 105.9220 ± *238754-53-5*0 Chlorine atom pentacation [Cl]+5 (g) 19147. 19149. ± 11. kJ/mol 35.44996 ± 20337-89-7*0 1,2,4-Trioxolane O(CH2OOCH2) (g) -204.7 -222.9 ± 2.1 kJ/mol 76.0514 ± 289-14-5*0 Ammonium hydroxide NH4OH (aq, undissoc) -366.688 ± 0.059 kJ/mol 35.04584 ± 1336-21-6*1000 Ammonia NH3 (aq, 100000 H2O) -80.06 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*861 Fluorine atom F (g, 2P3/2) 77.254 79.039 ± 0.017 kJ/mol 18.99840320 ± 14762-94-8*1 Hydrogen peroxide cation [HOOH]+ (g, cis, para) 931.06 924.20 ± 0.98 kJ/mol 34.01413 ± 12325-10-9*22 Hydrazoic acid HNNN (aq) 272.69 ± 0.47 kJ/mol 43.02816 ± 7782-79-8*800 Hypoiodite [IO]- (aq) -116.3 ± 5.4 kJ/mol 142.90442 ± 15065-65-3*800 Ethynylene C2 (g, singlet) 819.961 826.534 ± 0.082 kJ/mol 24.0214 ± 12070-15-4*2 1,2-Propadien-1-ylium-1-yl-3-ylidene [CCC]+ (g) 1939.1 1947.0 ± 1.3 kJ/mol 36.0316 ± 118090-85-0*0 Trihydrogen cation [H3]+ (g, para) 1110.304 1106.697 ± 0.013 kJ/mol 3.02327 ± 28132-48-1*2 Fluoroimidogen NF (g, singlet) 369.43 369.41 ± 0.80 kJ/mol 33.005143 ± 13967-06-1*2 2-Propen-1-ylium-1-ylidene [CH2CHC]+ (g) 1373.2 1369.6 ± 2.0 kJ/mol 39.0554 ± 88000-25-3*0 Hydrazoic acid HNNN (aq, undissoc) 257.70 ± 0.48 kJ/mol 43.02816 ± 7782-79-8*1000 3-Methylpentane CH3CH2CH(CH3)CH2CH3 (cr,l) -177.63 -201.90 ± 0.76 kJ/mol 86.1754 ± 96-14-0*500 Tetrabromomethane CBr4 (cr, monoclinic) 60.54 ± 0.96 kJ/mol 331.6267 ± 558-13-4*500 Tribromide [Br3]- (aq) -129.17 ± 0.22 kJ/mol 239.7125 ± 14522-80-6*800 Bromomethane CH3Br (l) -56.20 -59.22 ± 0.20 kJ/mol 94.9385 ± 74-83-9*590 2,3-Dimethylbutane CH3CH(CH3)CH(CH3)CH3 (cr,l) -182.43 -206.93 ± 0.81 kJ/mol 86.1754 ± 79-29-8*500 Chlorine atom hexacation [Cl]+6 (g) 28501. 28503. ± 11. kJ/mol 35.44941 ± 22541-73-7*0 Bromodioxy BrOO (g) 116.7 107.7 ± 3.8 kJ/mol 111.9028 ± 67177-47-3*0 Oxygen atom tetracation [O]+4 (g) 17719.207 17721.064 ± 0.025 kJ/mol 15.99721 ± 14127-65-2*0 Ammonia NH3 (aq, 4 H2O) -79.33 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*807 Trihydrogen H(HH) (g, 2s 2A1' Ry) 745.878 743.094 ± 0.062 kJ/mol 3.02382 ± 12184-91-7*1 Ketene CH2CO (g, para singlet) -45.34 -48.40 ± 0.11 kJ/mol 42.0367 ± 463-51-4*21 2,2-Dimethylbutane CH3CH2C(CH3)3 (cr,l) -187.93 -213.65 ± 0.75 kJ/mol 86.1754 ± 75-83-2*500 Chlorine trifluoride cation [FCl(F)F]+ (g) 1053.5 1049.2 ± 2.3 kJ/mol 92.44736 ± 478167-77-0*0 Oxoniumyl ion [H2O]+ (g, ortho) 978.492 975.588 ± 0.024 kJ/mol 18.01473 ± 56583-62-1*1 Fluorine atom hexacation [F]+6 (g) 45781.5 45783.3 ± 1.8 kJ/mol 18.99511172 ± 14701-04-3*0 Iodine monochloride ICl (l) -24.048 ± 0.063 kJ/mol 162.35717 ± 7790-99-0*590 Peroxyhypochlorous acid cation [HOOCl]+ (g, cis) 1050.8 1045.2 ± 2.5 kJ/mol 68.4589 ± *67952-07-2*2 1-Propen-1-yl-3-ylidene CHCHCH (g, quartet) 656.7 653.3 ± 1.1 kJ/mol 39.0559 ± 84654-90-0*1 Ethyl bromide CH3CH2Br (l) -55.40 -90.93 ± 0.25 kJ/mol 108.9651 ± 74-96-4*500 Water H2O (cr) -286.276 -292.717 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*510 Ammonia NH3 (aq, 5 H2O) -79.63 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*809 Difluorovinylidene cation [CCF2]+ (g) 1181.5 1183.0 ± 2.3 kJ/mol 62.0177 ± 268566-71-8*0 Ammonia NH3 (aq, 10 H2O) -80.16 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*815 Oxygen atom pentacation [O]+5 (g) 28708.788 28710.645 ± 0.053 kJ/mol 15.99666 ± 14127-66-3*0 Fluorine atom pentacation [F]+5 (g) 30617.6 30619.4 ± 1.8 kJ/mol 18.99566030 ± 14701-05-4*0 Ammonia NH3 (aq, 20 H2O) -80.38 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*818 Formaldehyde CH2O (g, para singlet) -105.382 -109.223 ± 0.094 kJ/mol 30.02598 ± 50-00-0*21 Propylidene CH3CH2CH (g, triplet) 349.49 335.73 ± 0.92 kJ/mol 42.0797 ± 6700-78-3*1 Chloro(chlorooxy)methylene ClCOCl (g, trans triplet) 101.1 104.7 ± 4.8 kJ/mol 98.9155 ± 479587-31-0*12 Hydroxyoxoammoniumyl [HONO]+ (g, cis) 1014.8 1008.4 ± 2.0 kJ/mol 47.01293 ± 80371-48-8*2 Peroxyhypochlorous acid anion [HOOCl]- (g, trans quartet) -2.8 -3.3 ± 2.6 kJ/mol 68.4600 ± *67952-08-3*1 Carbon trication [C]+3 (g) 8770.919 8776.065 ± 0.045 kJ/mol 12.00905 ± 14067-06-2*0 Dihydrogen anion [H2]- (g) 253.8 254.7 ± 1.2 kJ/mol 2.01643 ± 12184-89-3*0 Dinitrogen dimer (N2)2 (g) -0.88 0.84 ± 0.67 kJ/mol 56.02696 ± 154680-01-0*0 Nitrous acid anion [HONO]- (g, trans) -105.4 -109.4 ± 1.8 kJ/mol 47.01403 ± 256393-36-9*1 1,3,5-Hexatriynylium [CCCCCCH]+ (g, singlet) 1952.5 1961.4 ± 7.6 kJ/mol 73.0716 ± 81932-75-4*2 Deuterium molecule cation [D2]+ (g) 1492.286 1492.361 ± 0.000 kJ/mol 4.02765497609 ± 12184-84-8*0 Ammonia NH3 (aq, 3 H2O) -78.87 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*805 Methyl acetate CH3C(O)OCH3 (g) -394.15 -413.02 ± 0.56 kJ/mol 74.0785 ± 79-20-9*0 Carbon suboxide OCCCO (cr,l) -131.20 -116.16 ± 0.97 kJ/mol 68.0309 ± 504-64-3*500 Nitrogen atom trication [N]+3 (g) 9306.69 9308.55 ± 0.23 kJ/mol 14.005094 ± 18396-22-0*0 Nitrosyl nitrite anion [ONONO]- (g, t, c) -100.2 -103.4 ± 2.9 kJ/mol 76.01223 ± *122413-35-8*2 m-Benzyne C6H4 (g, triplet) 615.0 605.6 ± 1.4 kJ/mol 76.0960 ± 1828-89-3*1 Methyl formate HC(O)OCH3 (g) -346.85 -359.90 ± 0.61 kJ/mol 60.0520 ± 107-31-3*0 Bicyclo[1.1.0]buta-1,3-diene-2,4-diyl C(CC)C (g, singlet) 1047.09 1054.69 ± 0.67 kJ/mol 48.0428 ± 12184-80-4*2 Ethyl formate HC(O)OCH2CH3 (g) -375.0 -393.8 ± 1.0 kJ/mol 74.0785 ± 109-94-4*0 Fulvenallene CH2CC(CHCHCHCH) (g, triplet) 549.0 536.7 ± 2.4 kJ/mol 90.1225 ± 27041-32-3*1 Polyoxymethylene CH2O (cr, polyoxymethylene) -170.86 ± 0.21 kJ/mol 30.02598 ± 9002-81-7*500 Cycloheptatetraene C(CHCHCHCHCHCH) (g, triplet) 529.0 515.0 ± 2.3 kJ/mol 90.1225 ± 52783-93-4*1 4,5-Bis(methylene)-2-cyclopenten-1-yl CH(CHC(CH2)C(CH2)CH) (g) 315.3 297.1 ± 2.0 kJ/mol 91.1305 ± 302792-28-5*0 2,5-Bis(methylene)-3-cyclopenten-1-yl CH(C(CH2)CHCHC(CH2)) (g) 321.0 302.8 ± 2.0 kJ/mol 91.1305 ± 512782-58-0*0 Nitrogen atom pentacation [N]+5 (g) 26226.70 26228.56 ± 0.23 kJ/mol 14.003997 ± 20508-99-0*0 Formaldehyde CH2O (aq, unhydrol) -165.65 ± 0.22 kJ/mol 30.02598 ± 50-00-0*1000 Ammonia NH3 (aq, 50 H2O) -80.52 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*822 Nitrogen atom tetracation [N]+4 (g) 16781.74 16783.61 ± 0.23 kJ/mol 14.004546 ± 14452-70-1*0 Nitrogen atom hexacation [N]+6 (g) 79493.10 79494.96 ± 0.23 kJ/mol 14.003449 ± 15721-56-9*0 1-Propenylide [CH3CHCH]- (g, trans) 210.4 199.3 ± 2.0 kJ/mol 41.0723 ± 65887-20-9*1 Water trimer (H2O)3 (g) -762.66 -776.76 ± 0.20 kJ/mol 54.04584 ± 31014-12-7*0 Methyl hydrocarbonate C(O)(OH)OCH3 (g) -577.04 -591.84 ± 0.87 kJ/mol 76.0514 ± 7456-87-3*0 Tropylide [CH(CHCHCHCHCHCH)]- (g) 261.7 245.3 ± 2.0 kJ/mol 91.1310 ± 34464-18-1*0 1,3-Butadiyn-4-ylium-1-yl [CCCC]+ (g) 2109.8 2120.4 ± 2.8 kJ/mol 48.0423 ± 124708-46-9*0 Isoindene cation [C6H4(CHCH2CH)]+ (g) 985.2 961.9 ± 1.8 kJ/mol 116.1593 ± 1442045-79-5*0 Indenylium [C6H4(CHCHCH)]+ (g, triplet) 1081.2 1061.6 ± 2.2 kJ/mol 115.1513 ± 12203-21-3*1 Carbide [C]-4 (g) 2709.5 2714.6 ± 2.7 kJ/mol 12.01289 ± 12385-15-8*0 1,3-Butadiyne-1,4-diyl CCCC (g, triplet) 1052.20 1062.17 ± 0.64 kJ/mol 48.0428 ± 78015-07-3*1 Ammonia NH3 (aq, 100 H2O) -80.56 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*828 Hypochlorite [ClO]- (aq) -110.488 ± 0.076 kJ/mol 51.45265 ± 14380-61-1*1000 Acetoxy CH3C(O)O (g) -182.11 -190.82 ± 0.79 kJ/mol 59.0440 ± 13799-69-4*0 Oxygen atom octacation [O]+8 (g) 197447.75 197449.60 ± 0.12 kJ/mol 15.99501 ± 21450-98-6*0 Ethynylaminylium [HCCNH]+ (g, singlet) 1350.6 1348.8 ± 2.5 kJ/mol 40.0435 ± 103835-08-1*2 Propadienylidene CH2CC (g, singlet) 554.44 555.58 ± 0.39 kJ/mol 38.0480 ± 60731-10-4*2 Ammonia NH3 (aq, 50000 H2O) -80.22 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*855 Ethylideneoxoniumyloxy [CH3CHOO]+ (g, syn) 957.1 944.7 ± 2.3 kJ/mol 60.0514 ± 1427752-17-7*2 Hydroxylamine NH2OH (g) -33.06 -43.43 ± 0.42 kJ/mol 33.02996 ± 7803-49-8*0 2-Oxo-1-ethylium-1-yl [HCC(O)H]+ (g, syn-quartet) 1292.0 1288.7 ± 2.4 kJ/mol 42.0361 ± 214464-96-7*12 Oxoethylidene anion [HCC(O)H]- (g, syn-gauche) 92.3 89.0 ± 2.3 kJ/mol 42.0372 ± 106543-38-8*2 Propionic acid CH3CH2C(O)OH (g) -435.82 -453.71 ± 0.60 kJ/mol 74.0785 ± 79-09-4*0 Acetaldehyde CH3CHO (cr,l) -186.91 -191.62 ± 0.28 kJ/mol 44.0526 ± 75-07-0*500 Hydroxymethylene HCOH (g) 112.70 108.95 ± 0.27 kJ/mol 30.02598 ± 19710-56-6*0 Methylene CH2 (g) 391.066 391.612 ± 0.093 kJ/mol 14.02658 ± 2465-56-7*0 Hydrogen peroxide cation [HOOH]+ (g, trans, ortho) 897.29 890.31 ± 0.51 kJ/mol 34.01413 ± 12325-10-9*11 Succinic acid (CH2C(O)OH)2 (cr,l) -918.50 -940.23 ± 0.12 kJ/mol 118.0880 ± 110-15-6*500 Carbon pentacation [C]+5 (g) 52824.581 52829.727 ± 0.049 kJ/mol 12.00796 ± 14280-11-6*0 Tetraoxodinitrate anion [O2NNO2]- (g) -184.6 -187.8 ± 2.4 kJ/mol 92.0116 ± 63552-02-3*0 1,2-Dibromoethane CH2BrCH2Br (cr,l) -80.1 ± 1.2 kJ/mol 187.8612 ± 106-93-4*500 1-Propenylium [CH3CHCH]+ (g, trans) 1233.8 1223.3 ± 2.0 kJ/mol 41.0713 ± 50457-58-4*1 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-cis, syn) -42.6 -59.1 ± 2.3 kJ/mol 70.0898 ± 59120-04-6*21 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-trans) -53.3 -68.6 ± 1.5 kJ/mol 70.0898 ± 59120-04-6*1 Chlorine atom Cl (g, 2P3/2) 119.621 121.228 ± 0.0011 kJ/mol 35.45270 ± 22537-15-1*1 Fluorine atom heptacation [F]+7 (g) 63649.3 63651.1 ± 1.8 kJ/mol 18.99456314 ± 14700-77-7*0 Acrolein CH2CHCHO (g) -55.13 -65.22 ± 0.64 kJ/mol 56.0633 ± 107-02-8*0 Fluorine atom tetracation [F]+4 (g) 19594.3 19596.6 ± 1.7 kJ/mol 18.99620888 ± 14700-79-9*0 1-Oxo-2-propenide [CH2CHCO]- (g, II) 83.6 78.7 ± 2.5 kJ/mol 55.0559 ± 78944-75-9*2 Propadien-1-olate [CH2CCHO]- (g) 1.4 -4.4 ± 2.5 kJ/mol 55.0559 ± 109686-13-7*0 1-Formylethenylium [CH2CCHO]+ (g, triplet) 1158.8 1154.2 ± 3.0 kJ/mol 55.0548 ± 101705-89-9*1 mu-Oxodichlorine cation [ClOCl]+ (g) 1130.44 1126.84 ± 0.63 kJ/mol 86.9043 ± 51174-96-0*0 3-Oxo-1-propenyl CHCHCHO (g, trans) 190.96 184.98 ± 0.91 kJ/mol 55.0553 ± 206255-29-0*1 3-Oxo-1-propenyl CHCHCHO (g, anti-cis) 191.7 185.7 ± 2.1 kJ/mol 55.0553 ± 206255-29-0*21 2-Formylethen-1-ide [CHCHCHO]- (g, anti-cis) 30.5 23.8 ± 3.1 kJ/mol 55.0559 ± 135924-69-5*21 1,2-Propadien-1-one cation [CH2CCO]+ (g) 1012.8 1011.3 ± 1.8 kJ/mol 54.0468 ± 87612-93-9*0 2-Propynal cation [CHCCHO]+ (g) 1168.3 1167.2 ± 1.2 kJ/mol 54.0468 ± 100815-70-1*0 Difluorodioxidanium [FOOF]+ (g, cis) 1287.2 1283.1 ± 2.3 kJ/mol 69.99506 ± *7783-44-0*2 Formylethynyl cation [CC(CHO)]+ (g, singlet) 1540.0 1541.9 ± 2.7 kJ/mol 53.0389 ± *85905-64-2*2 Formylethynyl cation [CCCHO]+ (g, triplet) 1540.7 1542.8 ± 2.8 kJ/mol 53.0389 ± *85905-64-2*1 Deuteride D- (g) 146.991 148.904 ± 0.0021 kJ/mol 2.01465035791 ± 14452-69-8*0 Chlorodioxidenium [ClOO]+ (g) 1215.1 1212.9 ± 6.3 kJ/mol 67.4510 ± 64710-10-7*0 Hydrogen fluoride HF (aq, 3 H2O) -320.69 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*805 Hydrogen fluoride HF (aq, 100 H2O) -322.01 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*828 Hydroxylamine NH2OH (cr,l) -107.44 ± 0.60 kJ/mol 33.02996 ± 7803-49-8*500 (Hydroxyimino)methyl HCNOH (g, trans-cis) 258.9 252.8 ± 2.0 kJ/mol 44.03272 ± 206442-92-4*2 mu-Oxodichlorate anion [ClOCl]- (g) -147.8 -147.7 ± 2.5 kJ/mol 86.9053 ± 365546-30-1*0 Dioxaziridine HN(OO) (g) 277.5 270.8 ± 1.9 kJ/mol 47.01348 ± 67394-35-8*0 Cyanoacetylene cation [HCCCN]+ (g) 1495.56 1497.86 ± 0.57 kJ/mol 51.0462 ± 85398-68-1*0 Isocyanoacetylene cation [HCCNC]+ (g) 1567.8 1570.3 ± 1.3 kJ/mol 51.0462 ± 145076-03-5*0 Carbon hexacation [C]+6 (g) 100101.735 100106.882 ± 0.049 kJ/mol 12.00741 ± 16249-02-8*0 Ammonia NH3 (aq, 500 H2O) -80.58 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*833 sec-Butylium [CH3CH2CHCH3]+ (g) 792.8 769.1 ± 1.5 kJ/mol 57.1137 ± 16548-59-7*0 Cyanoethynylium [CCCN]+ (g) 1867.5 1874.2 ± 3.2 kJ/mol 50.0383 ± 104233-69-4*0 2-Iminoethyl CH2CHNH (g, syn) 221.7 210.4 ± 1.8 kJ/mol 42.0599 ± 73843-90-0*1 2-Iminoethyl anion [CH2CHNH]- (g, anti) 110.7 100.2 ± 2.3 kJ/mol 42.0604 ± 73843-87-5*2 2-Iminoethylium [CH2CHNH]+ (g, singlet) 1108.3 1097.6 ± 2.9 kJ/mol 42.0594 ± 73843-91-1*2 Hydrazoic acid anion [HNNN]- (g, cis) 316.3 310.1 ± 2.3 kJ/mol 43.02871 ± 203264-98-6*2 3-Imino-2-propen-1-ylidene CHCHCNH (g, singlet) 530.7 526.4 ± 1.2 kJ/mol 53.0627 ± 916765-05-4*1 Hydrogen iodide HI (aq, 5130 H2O) -56.643 ± 0.089 kJ/mol 127.912410 ± 10034-85-2*958 2-(Methylidyneamino)ethenyl CHCHNCH (g, singlet) 600.7 596.4 ± 1.2 kJ/mol 53.0627 ± 123416-74-0*1 (E)-2-Iminoethylium [CH2CHNH]+ (g, anti) 1108.3 1094.9 ± 2.9 kJ/mol 42.0594 ± 91127-33-2*0 (Z)-2-Iminoethylium [CH2CHNH]+ (g, syn) 1151.8 1143.1 ± 3.3 kJ/mol 42.0594 ± 91127-34-3*0 (Z)-2-Iminoethylium [CH2CHNH]+ (g, syn-triplet) 1151.8 1143.1 ± 3.3 kJ/mol 42.0594 ± 91127-34-3*11 Tetraoxygen O4 (g, D2h singlet) 69.8 65.1 ± 4.4 kJ/mol 63.9976 ± 12596-83-7*21 Tetraoxygen O4 (g, D2d singlet) 399.0 393.4 ± 3.9 kJ/mol 63.9976 ± 12596-83-7*23 Tetraoxygen O4 (g, D3h singlet) 465.6 459.6 ± 4.2 kJ/mol 63.9976 ± 12596-83-7*24 Oxygen atom trication [O]+3 (g) 10249.928 10252.880 ± 0.018 kJ/mol 15.99775 ± 14127-64-1*0 1,2-Butadien-1-ylium-1-yl [CH3CHCC]+ (g) 1466.9 1461.7 ± 3.1 kJ/mol 52.0740 ± 161054-21-3*0 Bicyclo[1.1.0]butan-3-id-1-yl [CH2(CC)CH2]- (g) 524.6 515.9 ± 2.6 kJ/mol 52.0751 ± 131273-95-5*0 1,2-Cyclobutadiene C(CHCH2CH) (g) 586.0 579.4 ± 2.2 kJ/mol 52.0746 ± 50682-90-1*0 Acetylene HCCH (g, cis-triplet) 599.1 599.0 ± 1.5 kJ/mol 26.0373 ± 74-86-2*11 But-3-en-1-yn-1-ide [CH2CHCC]- (g, triplet) 559.2 558.5 ± 2.2 kJ/mol 51.0672 ± 58870-47-6*1 Methylaminyliumyl [CH3N]+ (g, doublet ?) 1388.2 1381.9 ± 2.2 kJ/mol 29.04071 ± 56924-51-7*1 1-Hydroperoxyethylium [CH3CHOOH]+ (g, singlet) 690.7 675.8 ± 1.5 kJ/mol 61.0594 ± *126898-98-4*2 Nitrogen atom anion N- (g) 488.2 490.5 ± 2.3 kJ/mol 14.007289 ± 17778-87-9*0 Ammonia NH3 (aq, 1000 H2O) -80.57 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*839 Trihydrogen (H)(HH) (g, vdW) 215.9 218.3 ± 1.1 kJ/mol 3.02382 ± 12184-91-7*100 Silicon atom dication [Si]+2 (g) 2814.00 2816.98 ± 0.56 kJ/mol 28.08440 ± 14175-55-4*0 Silicon atom trication [Si]+3 (g) 6045.58 6048.56 ± 0.56 kJ/mol 28.08385 ± 14175-56-5*0 2-Hydroperoxyethyl CH2CH2OOH (g, anti-anti) 65.2 51.4 ± 2.2 kJ/mol 61.0599 ± 126898-97-3*11 Dioxosilane SiO2 (cr, tridymite) -901.5 -906.3 ± 1.4 kJ/mol 60.08430 ± 7631-86-9*515 Oxosilyliumyl [SiO]+ (g) 1022.0 1023.1 ± 2.9 kJ/mol 44.08435 ± 12359-18-1*0 Peroxyformate [HC(O)OO]- (g, anti) -320.7 -326.5 ± 1.7 kJ/mol 61.0174 ± 104960-05-6*2 Peroxyformyl HC(O)OO (g, anti) -90.4 -95.9 ± 1.7 kJ/mol 61.0168 ± 56240-83-6*2 Difluoroaminylium [NF2]+ (g, triplet) 1376.5 1373.9 ± 2.4 kJ/mol 52.002998 ± 31685-31-1*1 Oxygen atom dication [O]+2 (g) 4949.458 4953.000 ± 0.013 kJ/mol 15.99830 ± 14127-63-0*0 Hypochloroperoxoous acid, hydroxy ester HOOOCl (g, anti) 48.7 41.8 ± 2.5 kJ/mol 84.4588 ± 928652-99-7*2 Nitrogen atom dication [N]+2 (g) 4728.998 4731.826 ± 0.024 kJ/mol 14.005643 ± 17439-59-7*0 2-Aminoethenylium [CHCHNH2]+ (g, syn triplet) 1117.9 1106.8 ± 2.4 kJ/mol 42.0594 ± 64724-21-6*11 2-Aminoethenyl anion [CHCHNH2]- (g, syn) 242.0 231.3 ± 2.6 kJ/mol 42.0604 ± *64724-21-6*1 mu-Hydrotetrahydrodisilicon cation [SiH2(HSiH2)]+ (g) 981.6 968.8 ± 2.8 kJ/mol 61.21015 ± 160896-65-1*0 Di-mu-hydrotrihydrodisilicon cation [SiH2(HSiHH)]+ (g) 1033.7 1020.3 ± 2.8 kJ/mol 61.21015 ± *160896-65-1*0 Disilene anion [SiH2SiH2]- (g) 178.6 170.2 ± 3.0 kJ/mol 60.20331 ± 157379-08-3*0 Silylsilylene anion [SiH3SiH]- (g) 160.3 151.6 ± 3.0 kJ/mol 60.20331 ± 286949-98-2*0 Silylsilylene SiH3SiH (g, triplet) 381.3 372.5 ± 2.6 kJ/mol 60.20276 ± 50420-90-1*1 mu-Hydrotrihydrodisilicon SiH2(HSiH) (g) 317.9 307.8 ± 2.1 kJ/mol 60.20276 ± 497967-56-3*0 1-Methylethenylium [CH3CCH2]+ (g) 995.2 986.0 ± 1.9 kJ/mol 41.0713 ± 50457-57-3*0 Trioxygen difluoride FOOOF (g) 112.5 107.3 ± 1.1 kJ/mol 85.99501 ± 16829-28-0*0 1-Methylethenyl anion [CH3CCH2]- (g) 199.4 188.2 ± 2.0 kJ/mol 41.0723 ± 65887-19-6*0 mu-Hydrotrihydrodisilicon cation [Si(HSiH3)]+ (g) 1160.1 1152.0 ± 2.6 kJ/mol 60.20221 ± *497967-55-2*0 Fluorine atom dication [F]+2 (g) 5132.472 5134.257 ± 0.021 kJ/mol 18.99730604 ± 14701-07-6*0 Silyloxoniumylidene [SiH3O]+ (g, triplet) 1096.3 1089.9 ± 2.9 kJ/mol 47.10817 ± 152720-17-7*1 Formic acid HC(O)OH (aq, undissoc) -425.38 ± 0.45 kJ/mol 46.0254 ± 64-18-6*1000 Hydroxysilylium [SiH2OH]+ (g) 600.3 591.6 ± 2.9 kJ/mol 47.10817 ± 66639-72-3*0 Nitrosyl nitrate ONONO2 (g, cis-perp) 60.4 52.5 ± 1.9 kJ/mol 92.0111 ± 15969-55-8*2 1,5-Hexadiyne HCCCH2CH2CCH (cr,l) 385.9 ± 1.9 kJ/mol 78.1118 ± 628-16-0*500 Oxonium [H3O]+ (g, para) 605.89 599.14 ± 0.17 kJ/mol 19.02267 ± 13968-08-6*2 Ammonia NH3 (aq, 5000 H2O) -80.50 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*844 2-Methyl-2-propanol (CH3)3COH (l) -358.9 ± 1.9 kJ/mol 74.1216 ± 75-65-0*590 Ammonia NH3 (aq, 2 H2O) -78.02 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*803 Bicyclo[3.1.0]hexa-1,3-diene CH2((CCH)(CHCHCH)) (g) 406.5 390.9 ± 2.2 kJ/mol 78.1118 ± 28425-23-2*0 3-Ethenylidenecyclobutene CH2CC(CHCHCH2) (g) 406.5 392.4 ± 2.3 kJ/mol 78.1118 ± 813466-23-8*0 3,4-Hexadien-1-yne HCCCHCCHCH3 (g) 418.6 407.5 ± 2.6 kJ/mol 78.1118 ± 194024-51-6*0 3-Ethynylcyclobutene HCCCH(CHCHCH2) (g) 421.7 407.4 ± 2.4 kJ/mol 78.1118 ± 175090-90-1*0 Ammonia NH3 (aq, 10000 H2O) -80.45 ± 0.41 kJ/mol 17.03056 ± 7664-41-7*850 2-Chloro ozone ClO(O)O (g) 265.7 265.1 ± 3.7 kJ/mol 83.4509 ± *141801-66-3*0 Chlorine atom trication [Cl]+3 (g) 7487.2 7490.2 ± 3.3 kJ/mol 35.45105 ± 16547-50-5*0 2-Ethynyl-2-cyclopropen-1-ylidene HCCC(CCH) (g) 726.1 727.4 ± 3.2 kJ/mol 62.0694 ± 117992-84-4*0 Nitride [N]-3 (g) 1879.1 1881.0 ± 4.4 kJ/mol 14.008386 ± 18851-77-9*0 Pyramidane C(CH(CHCH)CH) (g) 602.4 593.9 ± 2.3 kJ/mol 64.0853 ± 66202-79-7*0 Spiropentadiene C((CHCH))2 (g) 651.9 644.6 ± 2.3 kJ/mol 64.0853 ± 1727-65-7*0 2-Aminoethylium [CH2CH2NH2]+ (g, triplet) 1042.6 1026.1 ± 2.4 kJ/mol 44.0752 ± 54088-54-9*1 2-Aminoethyl anion [CH2CH2NH2]- (g) 149.0 131.9 ± 2.1 kJ/mol 44.0763 ± 71857-14-2*0 Hydrogen peroxide HOOH (g, para) -129.426 -135.412 ± 0.057 kJ/mol 34.01468 ± 7722-84-1*2 1,2-Diphenylethane C6H5CH2CH2C6H5 (g) 180.69 142.20 ± 0.76 kJ/mol 182.2610 ± 103-29-7*0 Isocyanogen cation [CNCN]+ (g) 1654.1 1656.5 ± 1.4 kJ/mol 52.0343 ± 133415-63-1*0 2-Naphthalenylium [C6H4(CHCCHCH)]+ (g) 1195.7 1177.8 ± 3.5 kJ/mol 127.1620 ± 79319-69-0*0 1-Naphthalenylium [C6H4(CCHCHCH)]+ (g) 1192.7 1174.8 ± 3.4 kJ/mol 127.1620 ± 79319-68-9*0 Ammonium oxide (NH4)2O (cr,l) -428.47 -430.46 ± 0.61 kJ/mol 52.07640 ± 12161-77-2*500 Biphenyl C6H5C6H5 (l) 113.7 ± 1.1 kJ/mol 154.2078 ± 92-52-4*590 Benzophenone C6H5C(O)C6H5 (cr) -16.7 -42.0 ± 1.5 kJ/mol 182.2179 ± 119-61-9*510 Buckminsterfullerene C60 (g) 2522.9 2518.2 ± 6.3 kJ/mol 720.6420 ± 99685-96-8*0 Buckminsterfullerene C60 (cr,l) 2327.8 2337.2 ± 6.4 kJ/mol 720.6420 ± 99685-96-8*500 Cyclobutatrienyl CH(CCC) (g) 962.0 965.5 ± 2.4 kJ/mol 49.0507 ± *99417-52-4*0 Diisocyanogen cation [CNNC]+ (g, cis) 1838.6 1842.5 ± 3.1 kJ/mol 52.0343 ± *78800-21-2*2 Helium anion He- (g, 1s.2s.2p 4P) 1904.822 1904.822 ± 0.000 kJ/mol 4.0031506 ± 14452-58-5*3 Helium anion He- (g, 2p3 4S3/2) 5724.96 5724.96 ± 0.32 kJ/mol 4.0031506 ± 14452-58-5*4 Dihelium cation [He2]+ (g) 2143.643 2139.915 ± 0.018 kJ/mol 8.0046554 ± 12184-99-5*0 Dihelium anion [He2]- (g, quartet 4Pig) 1714.9 1711.2 ± 1.9 kJ/mol 8.0057526 ± 90188-47-9*1 Carbonic acid C(O)(OH)2 (aq, undissoc) -698.673 ± 0.028 kJ/mol 62.0248 ± 463-79-6*1000 Helium dihydride HeHH (g) -0.05 0.87 ± 0.42 kJ/mol 6.01848 ± 33309-42-1*0 Helium dihydride HHeH (g) 614.5 608.9 ± 2.6 kJ/mol 6.01848 ± *33309-42-1*0 Dihydrohelium cation [HHeH]+ (g) 1572.2 1568.9 ± 2.4 kJ/mol 6.01793 ± *12500-88-8*0 Neon dication [Ne]+2 (g) 6032.988 6033.214 ± 0.0041 kJ/mol 20.17860 ± 14041-55-5*0 Neon trication [Ne]+3 (g) 12152.403 12152.403 ± 0.032 kJ/mol 20.17805 ± 14158-25-9*0 Neon tetracation [Ne]+4 (g) 21529.82 21531.45 ± 0.25 kJ/mol 20.17751 ± 14041-56-6*0 Neon pentacation [Ne]+5 (g) 33711.1 33711.1 ± 1.2 kJ/mol 20.17696 ± 14175-48-5*0 Neon hexacation [Ne]+6 (g) 48949.3 48949.3 ± 1.3 kJ/mol 20.17641 ± 14041-57-7*0 Neon heptacation [Ne]+7 (g) 68948.7 68948.7 ± 1.4 kJ/mol 20.17586 ± 14175-50-9*0 Neon octacation [Ne]+8 (g) 92018.2 92018.2 ± 1.4 kJ/mol 20.17531 ± 14782-26-4*0 Neon nonacation [Ne]+9 (g) 207396.1 207396.1 ± 1.4 kJ/mol 20.17476 ± 15721-59-2*0 Tetrafluorohydrazine NF2NF2 (g, gauche) -12.5 -22.1 ± 1.4 kJ/mol 104.00709 ± 10036-47-2*2 Oxygen atom heptacation [O]+7 (g) 113369.48 113371.34 ± 0.12 kJ/mol 15.99556 ± 14274-89-6*0 Dioxofluorine cation [OFO]+ (g) 1667.0 1664.8 ± 2.8 kJ/mol 50.99665 ± 223566-05-0*0 Sulfur atom dication [S]+2 (g) 3528.18 3531.88 ± 0.14 kJ/mol 32.0649 ± 14127-58-3*0 Sulfur atom trication [S]+3 (g) 6890.8 6892.8 ± 3.2 kJ/mol 32.0644 ± 22541-72-6*0 Sulfur atom tetracation [S]+4 (g) 11447.1 11448.8 ± 3.4 kJ/mol 32.0638 ± 20681-10-1*0 Sulfur atom pentacation [S]+5 (g) 18451.4 18453.2 ± 3.4 kJ/mol 32.0633 ± 14127-59-4*0 Dioxofluorine anion [OFO]- (g) 155.9 154.4 ± 2.5 kJ/mol 50.99775 ± *175861-93-5*0 Difluorine cation [F2]+ (g) 1514.301 1514.475 ± 0.013 kJ/mol 37.9962578 ± 12184-86-0*0 Dioxathiirane S(OO) (g) 166.2 163.7 ± 2.2 kJ/mol 64.0648 ± 191663-73-7*0 Sulfur trioxide OS(O)O (cr,l) -454.31 ± 0.37 kJ/mol 80.0642 ± 7446-11-9*500 3-Oxidedioxathiirane OS(OO) (g) -127.9 -132.8 ± 2.2 kJ/mol 80.0642 ± 2243010-16-2*0 Trioxathietane S(OOO) (g) 263.6 258.5 ± 2.3 kJ/mol 80.0642 ± *2243010-16-2*0 Trioxodinitrate anion [ONN(O)O]- (g, non-vdW) -87.3 -93.0 ± 2.2 kJ/mol 76.01223 ± 194856-62-7*1 Oxadithiirane O(SS) (g) 136.4 134.3 ± 2.5 kJ/mol 80.1314 ± 488092-02-0*0 Sulfanylideneoxidaniumthiolate SOS (g) 220.7 219.0 ± 2.0 kJ/mol 80.1314 ± 401811-43-6*0 Thiozone cation [SSS]+ (g) 1073.1 1071.5 ± 2.0 kJ/mol 96.1975 ± 60063-56-1*0 cyc-Thiozone cation [S(SS)]+ (g) 1040.2 1039.6 ± 2.7 kJ/mol 96.1975 ± *60063-56-1*0 cyc-Trisulfide [S(SS)]- (g) 15.2 14.6 ± 2.5 kJ/mol 96.1985 ± *12597-04-5*0 Chlorine atom dication [Cl]+2 (g) 3668.474 3670.081 ± 0.013 kJ/mol 35.45160 ± 15723-23-6*0 Sulfuric acid OS(O)(OH)2 (aq) -878.92 -909.16 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*800 Fluorine atom octacation [F]+8 (g) 155686.5 155688.3 ± 1.8 kJ/mol 18.99401456 ± 15721-58-1*0 Sulfuric acid OS(O)(OH)2 (aq, 40 H2O) -886.35 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*821 Sulfuric acid OS(O)(OH)2 (aq, 700 H2O) -891.25 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*835 Sulfuric acid OS(O)(OH)2 (aq, 800 H2O) -891.62 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*837 Sulfuric acid OS(O)(OH)2 (aq, 1500 H2O) -893.41 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*840 Sulfuric acid OS(O)(OH)2 (aq, 2000 H2O) -894.37 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*841 Sulfuric acid OS(O)(OH)2 (aq, 3000 H2O) -895.83 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*842 Sulfuric acid OS(O)(OH)2 (aq, 5000 H2O) -897.86 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*844 Cyclopentadiene CH2(CHCHCHCH) (l) 110.37 ± 0.56 kJ/mol 66.1011 ± 542-92-7*590 Sulfuric acid OS(O)(OH)2 (aq, 60 H2O) -886.91 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*823 Sulfuric acid OS(O)(OH)2 (aq, 80 H2O) -887.26 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*826 Sulfuric acid OS(O)(OH)2 (aq, 90 H2O) -887.40 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*827 Sulfuric acid OS(O)(OH)2 (aq, 750 H2O) -891.44 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*836 Sulfuric acid OS(O)(OH)2 (aq, 1250 H2O) -892.87 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*954 Sulfuric acid OS(O)(OH)2 (aq, 6000 H2O) -898.58 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*845 Sulfuric acid OS(O)(OH)2 (aq, 7500 H2O) -899.50 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*847 Sulfuric acid OS(O)(OH)2 (aq, 8000 H2O) -899.76 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*848 Sulfuric acid OS(O)(OH)2 (aq, 9000 H2O) -900.23 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*849 Sulfuric acid monohydrate (OS(O)(OH)2)(H2O) (cr,l) -1126.33 -1127.48 ± 0.13 kJ/mol 116.0948 ± 10193-30-3*500 Sulfuric acid dihydrate (OS(O)(OH)2)(H2O)2 (cr,l) -1422.15 -1426.94 ± 0.14 kJ/mol 134.1100 ± 13451-10-0*500 Sulfuric acid trihydrate (OS(O)(OH)2)(H2O)3 (cr,l) -1716.10 -1720.21 ± 0.15 kJ/mol 152.1253 ± 40835-65-2*500 Sulfuric acid tetrahydrate (OS(O)(OH)2)(H2O)4 (cr,l) -2006.95 -2010.99 ± 0.17 kJ/mol 170.1406 ± 37006-20-5*500 Sulfuric acid pentahydrate (OS(O)(OH)2)(H2O)5 (cr,l) -2300.39 ± 0.18 kJ/mol 188.1559 ± 137168-49-1*500 Sulfuric acid hexahydrate (OS(O)(OH)2)(H2O)6 (cr,l) -2588.94 ± 0.20 kJ/mol 206.1712 ± 137168-50-4*500 Sulfuric acid heptahydrate (OS(O)(OH)2)(H2O)7 (cr,l) -2876.89 ± 0.22 kJ/mol 224.1864 ± 137168-51-5*500 Sulfuric acid octahydrate (OS(O)(OH)2)(H2O)8 (cr,l) -3164.40 ± 0.24 kJ/mol 242.2017 ± 88434-16-6*500 Sulfuric acid nonahydrate (OS(O)(OH)2)(H2O)9 (cr,l) -3451.56 ± 0.25 kJ/mol 260.2170 ± 137168-52-6*500 Sulfuric acid decahydrate (OS(O)(OH)2)(H2O)10 (cr,l) -3738.46 ± 0.27 kJ/mol 278.2323 ± 137168-53-7*500 Sulfuric acid dodecahydrate (OS(O)(OH)2)(H2O)12 (cr,l) -4311.68 ± 0.31 kJ/mol 314.2628 ± 30383-99-4*500 Sulfuric acid pentadecahydrate (OS(O)(OH)2)(H2O)15 (cr,l) -5170.58 ± 0.37 kJ/mol 368.3087 ± 425605-43-2*500 Cyclopropane cation [CH2(CH2CH2)]+ (g) 1021.8 1006.3 ± 1.5 kJ/mol 42.0792 ± 34496-93-0*0 Fluorine atom trication [F]+3 (g) 11182.872 11186.697 ± 0.032 kJ/mol 18.99675746 ± 14700-88-0*0 Hydrogen fluoride HF (aq, undissoc) -321.36 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*1000 Ammonia NH3 (aq) -77.033 ± 0.056 kJ/mol 17.03056 ± 7664-41-7*800 Sulfur tetraoxide OS(O)(O)O (g, triplet Td) -205.1 -211.3 ± 2.6 kJ/mol 96.0636 ± 12772-98-4*12 Dimethyl carbonate C(O)(OCH3)2 (g) -550.04 -570.47 ± 0.37 kJ/mol 90.0779 ± 616-38-6*0 Dioxoperoxysulfane (O2S)(OO) (g, singlet Cs ?) -177.1 -177.5 ± 3.5 kJ/mol 96.0636 ± *103613-08-7*12 Tribromine cation [Br3]+ (g) 1036.3 1013.6 ± 2.5 kJ/mol 239.7115 ± 33105-86-1*0 Ammonia NH3 (aq, 1 H2O) -75.73 ± 0.57 kJ/mol 17.03056 ± 7664-41-7*801 Thioformaldehyde cation [CH2S]+ (g) 1025.9 1022.3 ± 2.0 kJ/mol 46.0920 ± 61356-81-8*0 Formylimidogen HC(O)N (g, singlet) 245.3 242.1 ± 3.3 kJ/mol 43.02478 ± 42288-92-6*2 Dimethylsulfoxide CH3S(O)CH3 (l) -203.59 ± 0.49 kJ/mol 78.1344 ± 67-68-5*590 Cyanoamidogen HNCN (g, c-quartet) 657.4 654.6 ± 2.0 kJ/mol 41.03212 ± 12347-01-2*22 Acetylene anion [HCCH]- (g) 356.9 356.7 ± 1.9 kJ/mol 26.0378 ± 50443-89-5*0 Hydrogen isocyanide anion [HNC]- (g) 191.61 191.80 ± 0.32 kJ/mol 27.02593 ± 96913-22-3*0 Hydrogen bromide HBr (aq, 15 H2O) -117.38 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*817 Hydrogen fluoride HF (aq, 22.2 H2O) -321.85 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*888 Nitrosodioxaziridine ONN(OO) (g) 413.6 408.2 ± 1.8 kJ/mol 76.01168 ± 132871-99-9*0 Acetic acid CH3C(O)OH (aq, 0.5 H2O) -483.01 ± 0.33 kJ/mol 60.0520 ± 64-19-7*923 Hydrogen peroxide cation [HOOH]+ (g) 897.29 890.31 ± 0.51 kJ/mol 34.01413 ± 12325-10-9*0 Benzylidene C6H5CH (g) 473.0 457.7 ± 1.3 kJ/mol 90.1225 ± 3101-08-4*0 Trichlorine cation [Cl3]+ (g, triplet) 1196.6 1197.2 ± 3.2 kJ/mol 106.3576 ± 33088-85-6*1 (Iminomethyl)imidogen HNCHN (g) 420.1 413.2 ± 2.9 kJ/mol 42.04006 ± 87570-07-8*0 Hydrogen bromide HBr (aq, 150 H2O) -119.67 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*829 Fulvenallene CH2CC(CHCHCHCH) (g) 368.6 354.3 ± 1.1 kJ/mol 90.1225 ± 27041-32-3*0 (Iminomethyl)imidogen HNCHN (g, syn-triplet) 430.4 423.5 ± 3.3 kJ/mol 42.04006 ± 87570-07-8*12 Hydrogen fluoride HF (aq, 75 H2O) -321.99 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*825 Benzocyclopropene CH2(CCHCHCHCHC) (g) 395.9 379.6 ± 1.5 kJ/mol 90.1225 ± 4646-69-9*0 Cycloheptatetraene C(CHCHCHCHCHCH) (g) 418.7 403.1 ± 1.3 kJ/mol 90.1225 ± 52783-93-4*0 Bicyclo[1.1.0]buta-1,3-diene-2,4-diyl C(CC)C (g, triplet) 1133.0 1140.9 ± 2.7 kJ/mol 48.0428 ± 12184-80-4*1 Acetic acid CH3C(O)OH (aq, 1 H2O) -482.91 ± 0.33 kJ/mol 60.0520 ± 64-19-7*801 Hydrogen bromide HBr (aq, 200 H2O) -119.76 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*830 Acetic acid CH3C(O)OH (aq, 1.5 H2O) -482.86 ± 0.33 kJ/mol 60.0520 ± 64-19-7*802 Acetic acid CH3C(O)OH (aq, 2 H2O) -482.87 ± 0.33 kJ/mol 60.0520 ± 64-19-7*803 Hydrogen bromide HBr (aq, 12 H2O) -116.68 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*816 Acetic acid CH3C(O)OH (aq, 2.5 H2O) -482.96 ± 0.33 kJ/mol 60.0520 ± 64-19-7*804 Fluorosyl fluoride anion [FFO]- (g) -147.1 -146.8 ± 3.0 kJ/mol 53.99675 ± *86825-57-2*0 Hydrogen chloride HCl (aq, 500 H2O) -166.404 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*833 Hydrogen peroxide cation [HOOH]+ (g, trans, para) 897.32 890.31 ± 0.51 kJ/mol 34.01413 ± 12325-10-9*12 Acetic acid CH3C(O)OH (aq, 3 H2O) -483.04 ± 0.33 kJ/mol 60.0520 ± 64-19-7*805 Cyclopentadienide [CH(CHCHCHCH)]- (g) 101.16 88.18 ± 0.96 kJ/mol 65.0937 ± 12127-83-2*0 Ozone OOO (aq, undissoc) 118.19 ± 0.50 kJ/mol 47.99820 ± 10028-15-6*1000 Ethynol HCCOH (g, t-c triplet) 406.4 403.1 ± 3.2 kJ/mol 42.0367 ± 32038-79-2*12 Ammonium hydroxide NH4OH (aq, 2.5 H2O) -364.92 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*804 Isocyanogen bromide cation [BrNC]+ (g) 1470.0 1464.2 ± 5.9 kJ/mol 105.9209 ± 238754-53-5*0 trans-Cycloheptene CH2(CHCHCH2CH2CH2CH2) (g) 142.0 103.9 ± 1.9 kJ/mol 96.1702 ± 45509-99-7*0 Tetroxidane HOOOOH (g) -33.33 -43.26 ± 0.44 kJ/mol 66.0135 ± 29683-94-1*0 1-Hydroxy-2-propanone CH3C(O)CH2OH (g) -354.43 -373.77 ± 0.84 kJ/mol 74.0785 ± 116-09-6*0 Isocyanoamidogen HNNC (g) 489.7 487.7 ± 1.2 kJ/mol 41.03212 ± 947408-73-3*0 Isocyanoamidogen HNNC (g, quartet) 828.2 825.6 ± 1.3 kJ/mol 41.03212 ± 947408-73-3*2 Peroxyhypochlorous acid anion [HOOCl]- (g, quartet) -32.2 -33.9 ± 2.6 kJ/mol 68.4600 ± *67952-08-3*0 Ethynol HCCOH (g, t-t triplet) 409.3 406.3 ± 3.2 kJ/mol 42.0367 ± 32038-79-2*13 Hydrogen chloride HCl (aq, 700 H2O) -166.488 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*835 Hydroxyformyl HOCO (g) -181.15 -183.70 ± 0.40 kJ/mol 45.0174 ± 2564-86-5*0 Hydrogen chloride HCl (aq, 800 H2O) -166.517 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*837 Ethynol HCCOH (g, c-t triplet) 455.5 452.1 ± 3.2 kJ/mol 42.0367 ± 32038-79-2*14 Ethynol HCCOH (g, c-c triplet) 464.1 460.9 ± 3.2 kJ/mol 42.0367 ± 32038-79-2*15 Hydroxyformyl anion [HOCO]- (g) -319.54 -321.40 ± 0.56 kJ/mol 45.0180 ± 78944-70-4*0 Isocyanomethane CH3NC (cr,l) 146.4 ± 2.2 kJ/mol 41.0520 ± 593-75-9*500 2-Hydroxyethenyl CHCHOH (g) 138.00 132.18 ± 0.72 kJ/mol 43.0446 ± 108665-16-3*0 Oxide [O]-2 (g) 651. 653. ± 15. kJ/mol 16.00050 ± 16833-27-5*0 Indane cation [C6H4(CH2CH2CH2)]+ (g) 909.4 879.5 ± 1.7 kJ/mol 118.1752 ± 78854-02-1*0 Propylidene CH3CH2CH (g, singlet TS) 355.7 340.7 ± 2.0 kJ/mol 42.0797 ± 6700-78-3*2 Fluorine atom nonacation [F]+9 (g) 262121.1 262122.9 ± 1.8 kJ/mol 18.99346598 ± 35424-07-8*0 Nitrogen atom N (g, doublet) 700.559 702.462 ± 0.022 kJ/mol 14.006740 ± 17778-88-0*2 Indene anion [C6H4(CHCHCH2)]- (g) 238.2 215.8 ± 3.9 kJ/mol 116.1604 ± 39526-38-0*0 Hydrogen chloride HCl (aq, 20 H2O) -163.676 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*818 Difluoroaminylium [NF2]+ (g) 1157.81 1154.93 ± 0.71 kJ/mol 52.002998 ± 31685-31-1*0 Acetic acid CH3C(O)OH (aq, 4 H2O) -483.15 ± 0.33 kJ/mol 60.0520 ± 64-19-7*807 Isoindene anion [C6H4(CHCH2CH)]- (g) 239.8 217.1 ± 3.9 kJ/mol 116.1604 ± 496764-61-5*0 Methyl hydrocarbonate C(O)(OH)OCH3 (g, trans-trans) -532.5 -547.6 ± 2.0 kJ/mol 76.0514 ± 7456-87-3*4 2-Propene-1,2-diol CH2C(OH)CH2OH (g) -295.3 -314.4 ± 1.2 kJ/mol 74.0785 ± 44169-27-9*0 Dichloromethylene CCl2 (g) 229.87 231.05 ± 0.64 kJ/mol 82.9161 ± 1605-72-7*0 Indenide [C6H4(CHCHCH)]- (g) 125.3 105.3 ± 1.6 kJ/mol 115.1524 ± 12128-54-0*0 Indenylium [C6H4(CHCHCH)]+ (g) 1030.2 1010.7 ± 2.0 kJ/mol 115.1513 ± 12203-21-3*0 Phenol cation [C6H5OH]+ (g) 746.50 727.70 ± 0.63 kJ/mol 94.1107 ± 40932-22-7*0 Phenol anion [C6H5OH]- (g) 23.1 8.2 ± 4.9 kJ/mol 94.1118 ± 38752-11-3*0 Carbon C (g, quintuplet) 1114.944 1120.091 ± 0.039 kJ/mol 12.01070 ± 7440-44-0*3 Hydrogen chloride HCl (aq, 900 H2O) -166.542 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*838 Carbonylmethyloxonium [CH3OCO]+ (g) 561.2 552.9 ± 3.0 kJ/mol 59.0435 ± 24434-00-2*0 Hydrogen iodide HI (aq, 9 H2O) -52.89 ± 0.16 kJ/mol 127.912410 ± 10034-85-2*814 Methoxyoxomethyl CH3OCO (g) -152.7 -160.4 ± 1.1 kJ/mol 59.0440 ± 16481-04-2*0 Oxiranylidene CH2(CO) (g) 213.5 209.2 ± 1.4 kJ/mol 42.0367 ± 50983-85-2*0 Benzaldehyde cation [C6H5C(O)H]+ (g) 897.0 880.3 ± 1.7 kJ/mol 106.1214 ± 80226-59-1*0 Benzaldehyde anion [C6H5C(O)H]- (g) -55.1 -72.7 ± 2.7 kJ/mol 106.1225 ± 34473-57-9*0 Methoxyoxomethyl CH3OCO (g, anti-eclipsed) -151.9 -159.9 ± 2.1 kJ/mol 59.0440 ± 16481-04-2*3 Hydrogen fluoride HF (aq, 37 H2O) -321.92 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*890 Ammonium hydroxide NH4OH (aq, 3.5 H2O) -365.30 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*806 Benzoyl anion [C6H5CO]- (g) 70.2 57.6 ± 4.0 kJ/mol 105.1145 ± 78944-74-8*0 Hydrogen fluoride HF (aq, 400 H2O) -322.26 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*832 Acetic acid CH3C(O)OH (aq, 4.5 H2O) -483.19 ± 0.33 kJ/mol 60.0520 ± 64-19-7*808 Acetic acid CH3C(O)OH (aq, 5 H2O) -483.22 ± 0.33 kJ/mol 60.0520 ± 64-19-7*809 1,3-Butadiyne-1,4-diyl CCCC (g, singlet) 1083.94 1093.74 ± 0.83 kJ/mol 48.0428 ± 78015-07-3*2 Iodoniumyl [HI]+ (g) 1030.73 1028.56 ± 0.11 kJ/mol 127.911861 ± 12298-17-8*0 Acetyloxoniumylidene [CH3C(O)O]+ (g, triplet) 892.4 883.9 ± 2.9 kJ/mol 59.0435 ± 67057-47-0*1 Isocyanoamidogen HNNC (g, t-quartet) 837.9 835.2 ± 2.1 kJ/mol 41.03212 ± 947408-73-3*21 Hydrogen bromide HBr (aq, 300 H2O) -119.87 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*831 2-Methyliumylidynehydrazin-2-ium-1-ide [HNNC]+ (g) 1544.1 1542.4 ± 1.7 kJ/mol 41.03157 ± *947408-73-3*0 Cyanogen iodide cation [ICN]+ (g) 1271.3 1271.2 ± 1.7 kJ/mol 152.92136 ± 34749-78-5*0 Hydrogen chloride HCl (aq, 20000 H2O) -166.886 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*852 m-Tolualdehyde CH3C6H4C(O)H (cr, l, meta) -125.0 ± 1.2 kJ/mol 120.1485 ± 620-23-5*500 Hydrogen iodide HI (aq, 55.51 H2O) -55.854 ± 0.095 kJ/mol 127.912410 ± 10034-85-2*891 Hydrodioxonitrogen cation [HN(O)O]+ (g) 1130.0 1123.4 ± 2.9 kJ/mol 47.01293 ± 252986-76-8*0 Hydrogen bromide HBr (aq, 25 H2O) -118.36 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*819 Hydrogen bromide HBr (aq, 400 H2O) -119.93 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*832 Perchloric acid cation [HOCl(O)(O)O]+ (g) 1190.2 1180.6 ± 3.3 kJ/mol 100.4577 ± 91712-47-9*0 Propadienylidene CH2CC (g, triplet) 678.31 679.29 ± 0.41 kJ/mol 38.0480 ± 60731-10-4*1 Acetic acid CH3C(O)OH (aq, 6 H2O) -483.29 ± 0.33 kJ/mol 60.0520 ± 64-19-7*811 Ammonium hydroxide NH4OH (aq, 4.5 H2O) -365.54 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*808 2-Methanidylidynehydrazin-2-ium-1-ide [HNNC]- (g) 281.8 279.1 ± 1.4 kJ/mol 41.03267 ± *947408-74-4*0 Ammonium hydroxide NH4OH (aq, 4000 H2O) -366.32 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*843 Acetate [CH3C(O)O]- (aq) -485.10 ± 0.27 kJ/mol 59.0446 ± 71-50-1*800 Hexafluorobenzene cation [C6F6]+ (g) 13.68 9.89 ± 0.87 kJ/mol 186.0541 ± 34528-23-9*0 Imidogen NH (g, singlet) 509.34 509.39 ± 0.17 kJ/mol 15.014680 ± 13774-92-0*2 Hydrogen bromide HBr (aq, 500 H2O) -119.97 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*833 Acetic acid CH3C(O)OH (aq, 7 H2O) -483.36 ± 0.33 kJ/mol 60.0520 ± 64-19-7*812 Acetic acid CH3C(O)OH (aq, 8 H2O) -483.44 ± 0.33 kJ/mol 60.0520 ± 64-19-7*813 (Formyloxy)methyl HC(O)OCH2 (g) -151.3 -159.4 ± 1.1 kJ/mol 59.0440 ± 3122-12-1*0 Methane anion [CH4]- (g) 27.3 19.4 ± 5.1 kJ/mol 16.04301 ± 27680-53-1*0 Carboxymethyl CH2C(O)OH (g) -226.6 -236.4 ± 1.1 kJ/mol 59.0440 ± 2887-46-9*0 Methane CH4 (aq, undissoc) -87.699 ± 0.061 kJ/mol 16.04246 ± 74-82-8*1000 Hydrogen iodide HI (aq, 4 H2O) -44.15 ± 0.30 kJ/mol 127.912410 ± 10034-85-2*807 Hydrogen peroxide HOOH (aq) -190.73 ± 0.25 kJ/mol 34.01468 ± 7722-84-1*800 Hydrogen iodide HI (aq, 4000 H2O) -56.624 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*843 2-Methoxy-2-oxoethyl CH2C(O)OCH3 (g) -202.9 -218.1 ± 1.5 kJ/mol 73.0706 ± 54668-31-4*0 Chlorine trifluoride anion [FCl(F)F]- (g) -480.4 -481.9 ± 3.5 kJ/mol 92.44846 ± 184289-50-7*0 Ethynylamidogen anion [HCCNH]- (g) 233.7 230.5 ± 3.2 kJ/mol 40.0446 ± 64066-03-1*0 (Acetyloxy)methyl CH3C(O)OCH2 (g) -200.1 -213.9 ± 1.5 kJ/mol 73.0706 ± 2887-49-2*0 Hydrogen fluoride HF (aq, 7500 H2O) -324.98 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*847 Hydrogen iodide HI (aq, 75 H2O) -55.963 ± 0.099 kJ/mol 127.912410 ± 10034-85-2*825 Ammonium hydroxide NH4OH (aq, 7000 H2O) -366.29 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*846 Hydrogen iodide HI (aq, 10000 H2O) -56.691 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*850 Ammonium hydroxide NH4OH (aq, 5 H2O) -365.63 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*809 Nitrosyl nitrite anion [ONONO]- (g) -103.0 -106.2 ± 2.8 kJ/mol 76.01223 ± *122413-35-8*0 Ethynylaminylium [HCCNH]+ (g) 1277.8 1277.4 ± 2.6 kJ/mol 40.0435 ± 103835-08-1*0 Acetic acid CH3C(O)OH (aq, 9 H2O) -483.52 ± 0.33 kJ/mol 60.0520 ± 64-19-7*814 Hydrogen iodide HI (aq, 100 H2O) -56.042 ± 0.097 kJ/mol 127.912410 ± 10034-85-2*828 Furaniumyl [O(CHCHCHCH)]+ (g) 836.0 823.2 ± 1.3 kJ/mol 68.0734 ± 66429-00-3*0 Furan anion [O(CHCHCHCH)]- (g) 132.1 120.8 ± 3.9 kJ/mol 68.0745 ± 40807-44-1*0 Chloromethylene CHCl (g) 320.35 320.64 ± 0.89 kJ/mol 48.4713 ± 2108-20-5*0 Dioxymethylene HCOO (g) 341.8 339.8 ± 3.0 kJ/mol 45.0174 ± 438586-67-5*0 Pyridiniumyl [N(CHCHCHCHCH)]+ (g) 1051.31 1035.36 ± 0.61 kJ/mol 79.0994 ± 16399-94-3*0 Pyridine anion [N(CHCHCHCHCH)]- (g) 214.3 200.9 ± 3.2 kJ/mol 79.1005 ± 12169-63-0*0 Hydrogen bromide HBr (aq, 100000 H2O) -120.44 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*861 Peroxychlorite [OClOO]- (g) -116.2 -114.8 ± 2.3 kJ/mol 83.4514 ± 852472-63-0*0 Propylidene CH3CH2CH (g, singlet TS syn) 362.8 347.5 ± 2.8 kJ/mol 42.0797 ± 6700-78-3*22 Oxoethylidene HCC(O)H (g) 261.1 258.3 ± 1.1 kJ/mol 42.0367 ± 39920-84-8*0 Acetone enol CH3C(OH)CH2 (g) -151.27 -168.07 ± 0.68 kJ/mol 58.0791 ± 29456-04-0*0 Acetone enol CH3C(OH)CH2 (g, anti) -145.2 -162.5 ± 1.9 kJ/mol 58.0791 ± 29456-04-0*2 Chlorine atom heptacation [Cl]+7 (g) 39520. 39522. ± 11. kJ/mol 35.44886 ± 22537-27-5*0 Hydrogen iodide HI (aq, 10 H2O) -53.37 ± 0.17 kJ/mol 127.912410 ± 10034-85-2*815 Nitric oxide NO (aq, undissoc) 79.218 ± 0.078 kJ/mol 30.00614 ± 10102-43-9*1000 Hydrogen bromide HBr (aq, 555.1 H2O) -120.00 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*895 2-Hydroxyprop-1-en-1-yl CH3C(OH)CH (g) 101.62 90.26 ± 0.86 kJ/mol 57.0712 ± 1976041-84-5*0 2-Hydroxyprop-1-en-1-yl CH3C(OH)CH (g, cis-cis) 106.6 94.6 ± 1.9 kJ/mol 57.0712 ± 1976041-84-5*12 2-Hydroxyprop-1-en-1-yl CH3C(OH)CH (g, trans-trans) 114.0 102.8 ± 1.9 kJ/mol 57.0712 ± 1976041-84-5*21 2-Hydroxyprop-1-en-1-yl CH3C(OH)CH (g, cis-trans) 115.1 104.3 ± 1.9 kJ/mol 57.0712 ± 1976041-84-5*22 2-Oxo-1-ethylium-1-yl [HCC(O)H]+ (g, quartet) 1289.4 1286.7 ± 2.5 kJ/mol 42.0361 ± 214464-96-7*1 Hydrogen iodide HI (aq, 111 H2O) -56.072 ± 0.095 kJ/mol 127.912410 ± 10034-85-2*892 Methyl hydrocarbonate C(O)(OH)OCH3 (g, cis-trans) -571.9 -587.2 ± 1.9 kJ/mol 76.0514 ± 7456-87-3*2 Ammonium hydroxide NH4OH (aq, 6 H2O) -365.76 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*811 2-Methanidylidynehydrazin-2-ium-1-ide [HNNC]- (g, triplet) 518.6 516.2 ± 1.6 kJ/mol 41.03267 ± *947408-74-4*1 Oxoethylidene anion [HCC(O)H]- (g) 86.9 84.2 ± 2.1 kJ/mol 42.0372 ± 106543-38-8*0 Hydrodioxonitrate [HN(O)O]- (g) -62.0 -68.4 ± 3.1 kJ/mol 47.01403 ± 61508-71-2*0 1-Oxopropyl CH3CH2CO (g) -19.1 -30.6 ± 1.1 kJ/mol 57.0712 ± 15843-24-0*0 Hydroperoxonium [H2OOH]+ (g) 738.2 727.9 ± 1.2 kJ/mol 35.02207 ± 70850-26-9*0 Hydrogen chloride HCl (aq, 150 H2O) -165.978 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*829 Ammonium hydroxide NH4OH (aq, 8 H2O) -365.92 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*813 Hydrogen fluoride HF (aq, 1000 H2O) -322.71 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*839 Hydroxymethylene cation [HCOH]+ (g) 971.9 968.3 ± 1.4 kJ/mol 30.02543 ± 135395-06-1*0 Methyl nitrite CH3ONO (g, trans) -52.31 -64.27 ± 0.89 kJ/mol 61.0401 ± 624-91-9*1 Methyl nitrite CH3ONO (cr,l) -88.66 ± 0.54 kJ/mol 61.0401 ± 624-91-9*500 Chlorine atom dianion [Cl]-2 (g) 406.6 408.2 ± 4.8 kJ/mol 35.45380 ± 33944-49-9*0 Hydrogen peroxide HOOH (g, ortho) -129.406 -135.412 ± 0.057 kJ/mol 34.01468 ± 7722-84-1*1 Ethyl nitrite CH3CH2ONO (g, gauche-trans) -80.1 -98.3 ± 1.9 kJ/mol 75.0666 ± 109-95-5*2 Ethyl nitrite CH3CH2ONO (g, gauche-cis) -78.0 -97.0 ± 1.9 kJ/mol 75.0666 ± 109-95-5*3 1-Methylethylidene CH3CCH3 (g) 316.06 303.16 ± 0.97 kJ/mol 42.0797 ± 40852-89-9*0 Propyl nitrite CH3CH2CH2ONO (g) -95.7 -119.6 ± 1.8 kJ/mol 89.0932 ± 543-67-9*0 Propyl nitrite CH3CH2CH2ONO (g, trans-trans-cis) -95.4 -120.1 ± 2.4 kJ/mol 89.0932 ± 543-67-9*2 Propyl nitrite CH3CH2CH2ONO (g, gauche-gauche-trans) -95.6 -120.1 ± 2.4 kJ/mol 89.0932 ± 543-67-9*3 Propyl nitrite CH3CH2CH2ONO (g, gauche-gauche-trans II) -94.8 -119.4 ± 2.4 kJ/mol 89.0932 ± 543-67-9*4 Propyl nitrite CH3CH2CH2ONO (g, trans-gauche-trans) -94.7 -119.0 ± 2.4 kJ/mol 89.0932 ± 543-67-9*5 Propyl nitrite CH3CH2CH2ONO (g, trans-gauche-cis) -92.9 -117.8 ± 2.4 kJ/mol 89.0932 ± 543-67-9*6 Propyl nitrite CH3CH2CH2ONO (g, gauche-gauche-cis) -92.6 -117.7 ± 2.4 kJ/mol 89.0932 ± 543-67-9*7 Propyl nitrite CH3CH2CH2ONO (g, gauche-gauche-cis II) -91.2 -116.1 ± 2.8 kJ/mol 89.0932 ± 543-67-9*8 1,2-Dibromoethene CHBrCHBr (g) 121.5 101.3 ± 2.0 kJ/mol 185.8453 ± 540-49-8*0 Fluoronitrate [NF]- (g) 211.3 211.5 ± 2.8 kJ/mol 33.005692 ± 33088-90-3*0 Methyl hydrocarbonate C(O)(OH)OCH3 (g, trans-cis) -562.8 -578.3 ± 1.9 kJ/mol 76.0514 ± 7456-87-3*3 Hydrogen iodide HI (aq, 2500 H2O) -56.578 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*898 Bromine atom Br (g, 2P1/2) 162.010 155.947 ± 0.055 kJ/mol 79.90400 ± 10097-32-2*2 2,2,4-Trimethylpentane (CH3)2CHCH2C(CH3)3 (g) -171.1 -223.5 ± 1.5 kJ/mol 114.2285 ± 540-84-1*0 Hydrogen iodide HI (aq, 150 H2O) -56.134 ± 0.097 kJ/mol 127.912410 ± 10034-85-2*829 Hydrogen bromide HBr (aq, 20 H2O) -118.02 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*818 Dioxoethylium [OCHCO]+ (g) 688.6 689.8 ± 2.9 kJ/mol 57.0276 ± *1994332-01-2*0 Ethanedial anion [OCHCO]- (g) -188.8 -190.3 ± 3.1 kJ/mol 57.0287 ± 1994332-01-2*0 Cyanic fluoride cation [FCN]+ (g) 1294.2 1294.6 ± 1.1 kJ/mol 45.01529 ± 62532-69-8*0 Hydroxymethylene anion [HCOH]- (g) 147.1 144.2 ± 1.6 kJ/mol 30.02653 ± 207914-87-2*0 Hydroxyoxoethenylium [HOCCO]+ (g) 866.4 865.2 ± 3.5 kJ/mol 57.0276 ± *1994332-00-1*0 Hydrogen bromide HBr (aq, 30 H2O) -118.59 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*820 Acetic acid CH3C(O)OH (aq, 10 H2O) -483.60 ± 0.33 kJ/mol 60.0520 ± 64-19-7*815 (E)-Difluorodiazene cation [FNNF]+ (g, trans) 1307.4 1302.3 ± 3.7 kJ/mol 66.00974 ± *13776-62-0*1 Chlorohydroxymethyl CH(Cl)OH (g) -54.7 -60.4 ± 1.1 kJ/mol 65.4787 ± 147139-06-8*0 Hydrogen iodide HI (aq, 12 H2O) -54.02 ± 0.17 kJ/mol 127.912410 ± 10034-85-2*816 Hydrobromate ion [HBr]- (g) -5.5 -12.0 ± 4.3 kJ/mol 80.9125 ± 85532-97-4*0 1,1-Dibromoethane CH3CHBr2 (cr,l) -67.0 ± 1.3 kJ/mol 187.8612 ± 557-91-5*500 Ethynediolide [HOCCO]- (g) -132.9 -134.1 ± 3.5 kJ/mol 57.0287 ± 1994332-00-1*0 Dichlorine cation [Cl2]+ (g) 1108.307 1108.286 ± 0.0062 kJ/mol 70.9049 ± 12595-90-3*0 Acetic acid CH3C(O)OH (aq, 12 H2O) -483.75 ± 0.33 kJ/mol 60.0520 ± 64-19-7*816 Tetraoxidanyl HOOOO (g, trans) 76.7 69.5 ± 6.1 kJ/mol 65.0055 ± 69696-93-1*1 3-Buten-2-one CH3C(O)CHCH2 (g) -95.30 -110.84 ± 0.85 kJ/mol 70.0898 ± 78-94-4*0 2-Ethylidenedioxidan-2-ium-1-ide CH3CHOO (g) 51.18 37.77 ± 0.83 kJ/mol 60.0520 ± 68941-70-8*0 3-Buten-2-one CH3C(O)CHCH2 (g, cis) -93.7 -109.8 ± 1.6 kJ/mol 70.0898 ± 78-94-4*2 Hydrogen fluoride HF (aq, 55.51 H2O) -321.96 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*891 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-trans, anti) -48.0 -64.2 ± 2.3 kJ/mol 70.0898 ± 59120-04-6*12 Chloroethane CH3CH2Cl (cr,l) -134.35 -135.97 ± 0.25 kJ/mol 64.5138 ± 75-00-3*500 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-cis, anti) -37.8 -54.2 ± 2.3 kJ/mol 70.0898 ± 59120-04-6*22 Diazene cation [HNNH]+ (g, trans-cis equilib) 1132.53 1125.60 ± 0.64 kJ/mol 30.02881 ± 76986-17-9*1 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g, s-cis) -42.6 -58.6 ± 2.3 kJ/mol 70.0898 ± 59120-04-6*2 1,3-Butadien-2-ol CH2C(OH)CHCH2 (g) -53.3 -68.2 ± 1.5 kJ/mol 70.0898 ± 59120-04-6*0 Hydrogen chloride HCl (aq, 200 H2O) -166.103 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*830 Acetic acid CH3C(O)OH (aq, 15 H2O) -483.92 ± 0.33 kJ/mol 60.0520 ± 64-19-7*817 Hydrogen fluoride HF (aq, 2000 H2O) -323.39 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*841 Hydrogen chloride HCl (aq, 555.1 H2O) -166.431 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*895 Hypochlorous acid HOCl (aq) -110.488 ± 0.076 kJ/mol 52.46004 ± 7790-92-3*800 (Methylamino)methyl anion [CH3NHCH2]- (g) 202.1 185.2 ± 3.1 kJ/mol 44.0763 ± *31277-25-5*0 Water H2O (cr, l, eq.press.) -286.278 -285.806 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*499 mu-Oxodioxodinitrogen [ONONO]+ (g, t, t) 984.0 981.0 ± 3.2 kJ/mol 76.01113 ± 87950-63-8*1 Acrolein cation [CH2CHCHO]+ (g) 920.00 910.04 ± 0.79 kJ/mol 56.0627 ± 84005-05-0*0 Acrolein cation [CH2CHCHO]+ (g, cis) 930.8 921.0 ± 1.9 kJ/mol 56.0627 ± 84005-05-0*2 Acrolein anion [CH2CHCHO]- (g) -71.8 -81.3 ± 3.1 kJ/mol 56.0638 ± 23555-87-5*0 Acrolein anion [CH2CHCHO]- (g, trans) -68.0 -78.0 ± 3.5 kJ/mol 56.0638 ± 23555-87-5*1 Chlorine pentafluoride anion [FCl(F)(F)(F)F]- (g) -619.1 -622.6 ± 4.3 kJ/mol 130.44526 ± 184851-42-1*0 Dihydroxymethyl CH(OH)2 (g) -196.9 -205.2 ± 1.1 kJ/mol 47.0333 ± 14840-85-8*0 Dihydroxymethyl CH(OH)2 (g, syn-syn) -190.6 -199.3 ± 2.2 kJ/mol 47.0333 ± 14840-85-8*2 Dihydroxymethyl CH(OH)2 (g, anti-anti) -187.9 -196.7 ± 2.0 kJ/mol 47.0333 ± 14840-85-8*3 Propyn-1-ol cation [CH3CCOH]+ (g) 959.9 951.7 ± 3.0 kJ/mol 56.0627 ± 84005-04-9*0 Hydrogen chloride HCl (aq, 40 H2O) -164.927 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*821 2-Methyloxirene CH3C(CHO) (g, triplet) 344.0 334.7 ± 1.8 kJ/mol 56.0633 ± 2835-41-8*1 2-Methyloxirene CH3C(CHO) (g, c-triplet) 346.6 336.7 ± 2.5 kJ/mol 56.0633 ± 2835-41-8*12 Hydrogen fluoride HF (aq, 5000 H2O) -324.43 ± 0.14 kJ/mol 20.006343 ± 7664-39-3*844 Iminomethide [HCNH]- (g) 237.3 233.6 ± 1.8 kJ/mol 28.03387 ± 90623-30-6*0 Hydrogen bromide HBr (aq, 2 H2O) -92.67 ± 0.13 kJ/mol 80.9119 ± 10035-10-6*803 Ammonium hydroxide NH4OH (aq, 12 H2O) -366.07 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*816 Hydrogen iodide HI (aq, 7000 H2O) -56.666 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*846 Acryloyl CH2CHCO (g) 101.1 96.3 ± 1.4 kJ/mol 55.0553 ± 72241-20-4*0 Acryloyl CH2CHCO (g, 2A') 101.1 95.9 ± 1.4 kJ/mol 55.0553 ± 72241-20-4*1 Acryloyl CH2CHCO (g, 2A', cis, TS?) 109.5 103.8 ± 5.7 kJ/mol 55.0553 ± 72241-20-4*12 1-Oxo-2-propenylium [CH2CHCO]+ (g) 772.8 765.9 ± 3.0 kJ/mol 55.0548 ± 35335-83-2*0 1-Oxo-2-propenylium [CH2CHCO]+ (g, triplet) 1036.1 1030.7 ± 3.9 kJ/mol 55.0548 ± 35335-83-2*1 1-Oxo-2-propenide [CH2CHCO]- (g) 50.7 46.0 ± 2.6 kJ/mol 55.0559 ± 78944-75-9*0 Hydrogen bromide HBr (aq, 700 H2O) -120.04 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*835 Dihydroxymethylium [CH(OH)2]+ (g) 421.5 410.4 ± 3.0 kJ/mol 47.0328 ± 180071-68-5*0 2-Methanidylidynehydrazin-2-ium-1-ide [HNNC]- (g, t-triplet) 531.6 530.2 ± 2.3 kJ/mol 41.03267 ± *947408-74-4*11 1-Formylethenylium [CH2CCHO]+ (g) 1023.5 1018.0 ± 2.3 kJ/mol 55.0548 ± 101705-89-9*0 Hydrogen chloride HCl (aq, 300 H2O) -166.254 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*831 Hydroperoxyimidogen HOON (g, cis) 111.9 109.0 ± 2.8 kJ/mol 47.01348 ± 877456-58-1*2 Dihydroxymethylium [CH(OH)2]+ (g, anti-anti) 428.5 417.3 ± 3.4 kJ/mol 47.0328 ± 180071-68-5*3 Oxiranylium [CH2(CHO)]+ (g) 901.3 893.3 ± 1.4 kJ/mol 43.0441 ± 57789-76-1*0 3-Oxo-1-propenyl CHCHCHO (g) 190.96 185.41 ± 0.91 kJ/mol 55.0553 ± 206255-29-0*0 Acetylide [C2]-2 (g) 843.0 849.5 ± 3.2 kJ/mol 24.0225 ± 34846-56-5*0 3-Oxo-1-propenyl CHCHCHO (g, cis) 191.7 185.9 ± 2.1 kJ/mol 55.0553 ± 206255-29-0*2 Hydrogen chloride HCl (aq, 25 H2O) -164.170 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*819 3-Oxo-1-propenyl CHCHCHO (g, syn-cis) 201.4 195.5 ± 2.0 kJ/mol 55.0553 ± 206255-29-0*22 3-Oxo-1-propenyl CHCHCHO (g, syn-trans) 206.1 200.2 ± 2.0 kJ/mol 55.0553 ± 206255-29-0*12 3-Oxo-1-propenylium [CHCHCHO]+ (g) 1005.1 1002.8 ± 2.4 kJ/mol 55.0548 ± 101705-90-2*0 3-Oxo-1-propenylium [CHCHCHO]+ (g, triplet) 1185.6 1180.0 ± 3.0 kJ/mol 55.0548 ± 101705-90-2*1 Water dimer cation [(H2O)2]+ (g) 557.2 546.8 ± 3.0 kJ/mol 36.03001 ± 158061-35-9*0 3-Oxo-1-propenylium [CHCHCHO]+ (g, trans-triplet) 1185.6 1179.8 ± 3.0 kJ/mol 55.0548 ± 101705-90-2*11 3-Oxo-1-propenylium [CHCHCHO]+ (g, cis-triplet) 1197.7 1192.4 ± 3.4 kJ/mol 55.0548 ± 101705-90-2*12 Cycloprop-2-yliumyl [CH2(CHCH)]+ (g) 1225.53 1218.38 ± 0.58 kJ/mol 40.0633 ± 65812-78-4*0 3-Oxo-1-propenylium [CHCHCHO]+ (g, syn-trans-triplet) 1195.7 1189.8 ± 3.4 kJ/mol 55.0548 ± 101705-90-2*112 3-Oxo-1-propenylium [CHCHCHO]+ (g, syn-cis-triplet) 1205.7 1200.2 ± 3.8 kJ/mol 55.0548 ± 101705-90-2*122 2-Formylethen-1-ide [CHCHCHO]- (g) 27.3 21.3 ± 2.5 kJ/mol 55.0559 ± 135924-69-5*0 2-Formylethen-1-ide [CHCHCHO]- (g, trans) 27.3 20.6 ± 2.5 kJ/mol 55.0559 ± 135924-69-5*1 2-Formylethen-1-ide [CHCHCHO]- (g, cis) 30.5 23.8 ± 3.1 kJ/mol 55.0559 ± 135924-69-5*2 Acetic acid CH3C(O)OH (aq, 20 H2O) -484.11 ± 0.33 kJ/mol 60.0520 ± 64-19-7*818 2-Formylethen-1-ide [CHCHCHO]- (g, syn-cis) 54.6 47.9 ± 3.1 kJ/mol 55.0559 ± 135924-69-5*22 2-Formylethen-1-ide [CHCHCHO]- (g, syn-trans) 65.0 58.4 ± 3.1 kJ/mol 55.0559 ± 135924-69-5*12 Oxiranyl anion [CH2(CHO)]- (g) 121.3 113.4 ± 1.5 kJ/mol 43.0452 ± 72722-59-9*0 1,2-Propadien-1-one anion [CH2CCO]- (g) 49.8 48.5 ± 3.1 kJ/mol 54.0479 ± 159171-62-7*0 Chlorous acid cation [HOClO]+ (g) 996.6 991.6 ± 3.1 kJ/mol 68.4589 ± *99559-66-7*0 Acetic acid CH3C(O)OH (aq, 25 H2O) -484.23 ± 0.33 kJ/mol 60.0520 ± 64-19-7*819 Ammonium hydroxide NH4OH (aq, 15 H2O) -366.13 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*817 1-Oxo-2-propyn-1-ylium [HCCCO]+ (g) 1001.7 1003.1 ± 3.0 kJ/mol 53.0389 ± 53474-99-0*0 3-Oxo-1,2-propadien-1-yl anion [HCCCO]- (g) 179.4 182.0 ± 3.2 kJ/mol 53.0400 ± 557113-97-0*0 Acetic acid CH3C(O)OH (aq, 30 H2O) -484.32 ± 0.33 kJ/mol 60.0520 ± 64-19-7*820 Acetic acid CH3C(O)OH (aq, 40 H2O) -484.43 ± 0.33 kJ/mol 60.0520 ± 64-19-7*821 Methyl hydrocarbonate C(O)(OH)OCH3 (cr,l) -629.2 ± 1.4 kJ/mol 76.0514 ± 7456-87-3*500 Formylethynyl anion [CCCHO]- (g) 100.5 101.8 ± 3.4 kJ/mol 53.0400 ± 85905-64-2*0 Dioxyamidogen HNOO (g, trans) 251.1 244.6 ± 2.5 kJ/mol 47.01348 ± 71843-95-3*1 2-Cyclopropen-1-one cation [OC(CHCH)]+ (g) 1078.8 1075.7 ± 2.0 kJ/mol 54.0468 ± 100815-68-7*0 Ethanimine CH3CHNH (g) 55.79 41.16 ± 0.72 kJ/mol 43.0678 ± 20729-41-3*0 Propylidene anion [CH3CH2CH]- (g) 300.8 286.7 ± 3.2 kJ/mol 42.0803 ± *121408-55-7*0 Dihydroxymethylium [CH(OH)2]+ (g, syn-syn) 439.4 428.2 ± 3.4 kJ/mol 47.0328 ± 180071-68-5*2 Acetic acid CH3C(O)OH (aq, 50 H2O) -484.51 ± 0.33 kJ/mol 60.0520 ± 64-19-7*822 Fluorine atom F (g, 2P1/2) 82.088 83.873 ± 0.017 kJ/mol 18.99840320 ± 14762-94-8*2 Isourea NHC(OH)NH2 (g) -156.1 -172.7 ± 2.6 kJ/mol 60.05534 ± 4744-36-9*0 Pentachloroethylium [CCl3CCl2]+ (g) 838.1 836.4 ± 3.3 kJ/mol 201.2844 ± *7094-17-9*0 O--HH Complex (H2)(O) (g, vdW Cinfv ?) 247.7 249.0 ± 2.7 kJ/mol 18.01528 ± *7732-18-5*101 Carbamoyl anion [NH2CO]- (g) -81.9 -87.8 ± 3.1 kJ/mol 44.03327 ± 78944-69-1*0 Pentachloroethanide [CCl3CCl2]- (g) -281.8 -280.3 ± 3.9 kJ/mol 201.2854 ± 263019-83-6*0 Carbamoyl HNCOH (g) 74.1 68.3 ± 2.7 kJ/mol 44.03272 ± *2858-51-7*0 Carbamoyl HNCOH (g, trans-cis) 76.5 69.9 ± 3.2 kJ/mol 44.03272 ± *2858-51-7*2 Carbamoyl HNCOH (g, cis-trans) 96.4 90.1 ± 3.2 kJ/mol 44.03272 ± *2858-51-7*3 Carbamoyl HNCOH (g, cis-cis) 110.9 104.8 ± 3.2 kJ/mol 44.03272 ± *2858-51-7*4 Ethane anion [CH3CH3]- (g) 41.8 26.5 ± 4.4 kJ/mol 30.0696 ± 54064-82-3*0 Iodine monochloride ICl (cr,l) -36.511 -35.537 ± 0.063 kJ/mol 162.35717 ± 7790-99-0*500 Dihydroxymethanide [CH(OH)2]- (g) -194.2 -202.4 ± 1.8 kJ/mol 47.0339 ± 61192-32-3*0 (Hydroxyimino)methyl HCNOH (g) 250.2 244.4 ± 1.8 kJ/mol 44.03272 ± 206442-92-4*0 Hydrogen iodide HI (aq, 15 H2O) -54.586 ± 0.092 kJ/mol 127.912410 ± 10034-85-2*817 Trihydrogen H(HH) (g, Ry) 745.878 743.199 ± 0.062 kJ/mol 3.02382 ± 12184-91-7*0 (Hydroxyimino)methyl HCNOH (g, cis-trans) 262.6 257.2 ± 2.5 kJ/mol 44.03272 ± 206442-92-4*3 (Hydroxyimino)methyl HCNOH (g, cis-cis) 281.4 276.0 ± 2.5 kJ/mol 44.03272 ± 206442-92-4*4 Fluorosyl fluoride FFO (g) 192.8 193.3 ± 2.3 kJ/mol 53.99621 ± 86825-57-2*0 Ethylideneammoniumylidene [CH3CHN]+ (g, triplet) 1310.0 1300.4 ± 3.0 kJ/mol 42.0594 ± 91127-36-5*1 Formamide enol NHCHOH (g) -130.6 -141.6 ± 1.3 kJ/mol 45.04066 ± 60100-09-6*0 Acetic acid CH3C(O)OH (aq, 55.51 H2O) -484.54 ± 0.33 kJ/mol 60.0520 ± 64-19-7*891 Formamide enol NHCHOH (g, anti-anti) -116.6 -127.6 ± 2.1 kJ/mol 45.04066 ± 60100-09-6*2 Formamide enol NHCHOH (g, syn-anti) -115.9 -126.6 ± 2.1 kJ/mol 45.04066 ± 60100-09-6*3 Formamide enol NHCHOH (g, syn-syn) -109.8 -120.6 ± 2.1 kJ/mol 45.04066 ± 60100-09-6*4 Dihydroxymethanide [CH(OH)2]- (g, syn-anti) -192.0 -201.3 ± 2.4 kJ/mol 47.0339 ± 61192-32-3*1 Aminohydroxymethylene NH2COH (g) -22.4 -33.0 ± 1.6 kJ/mol 45.04066 ± 160720-48-9*0 Aminohydroxymethylene NH2COH (g, singlet) -22.4 -33.0 ± 1.6 kJ/mol 45.04066 ± 160720-48-9*2 Aminohydroxymethylene NH2COH (g, syn-singlet) 1.7 -8.9 ± 2.3 kJ/mol 45.04066 ± 160720-48-9*22 Aminohydroxymethylene NH2COH (g, triplet) 217.2 209.7 ± 3.0 kJ/mol 45.04066 ± 160720-48-9*1 Ethylideneazanide [CH3CHN]- (g) 147.8 137.6 ± 3.2 kJ/mol 42.0604 ± 144810-43-5*0 Aminohydroxymethylene NH2COH (g, gauche-triplet) 220.1 211.4 ± 3.4 kJ/mol 45.04066 ± 160720-48-9*12 Cyanic fluoride anion [FCN]- (g) -20.7 -18.7 ± 2.9 kJ/mol 45.01639 ± 34507-50-1*0 Oxonium [H3O]+ (g, ortho) 605.95 599.14 ± 0.17 kJ/mol 19.02267 ± 13968-08-6*1 Difluorodiazene FNNF (g) 78.5 73.4 ± 2.1 kJ/mol 66.01029 ± 10578-16-2*0 Dihydroxymethanide [CH(OH)2]- (g, anti-anti) -177.6 -187.5 ± 2.4 kJ/mol 47.0339 ± 61192-32-3*3 Formaldoxime CH2NOH (g) 30.6 20.0 ± 1.3 kJ/mol 45.04066 ± 75-17-2*0 1,3-Propanediyl CH2CH2CH2 (g) 319.3 307.9 ± 1.3 kJ/mol 42.0797 ± 32458-33-6*0 Diazirinyl HC(NN) (g) 491.06 487.67 ± 0.96 kJ/mol 41.03212 ± 69967-71-1*0 Hydrogen chloride HCl (aq, 2000 H2O) -166.681 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*841 Hydrogen fluoride HF (aq, 3000 H2O) -323.83 ± 0.12 kJ/mol 20.006343 ± 7664-39-3*842 2-Propenylidene CHCHCH2 (g, triplet) 417.5 410.6 ± 1.5 kJ/mol 40.0639 ± 19527-08-3*1 1,2-Dichloroethene CHClCHCl (g) 3.80 -1.52 ± 0.55 kJ/mol 96.9427 ± 540-59-0*0 Hydrogen bromide HBr (aq, 40 H2O) -118.91 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*821 Diazirenide [HC(NN)]- (g, triplet) 504.8 501.3 ± 2.9 kJ/mol 41.03267 ± 130614-84-5*1 Acetic acid CH3C(O)OH (aq, 111 H2O) -484.67 ± 0.33 kJ/mol 60.0520 ± 64-19-7*892 Hydrogen fluoride HF (aq, 35 H2O) -321.91 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*904 2-Iminoethyl CH2CHNH (g) 219.35 208.67 ± 0.86 kJ/mol 42.0599 ± 73843-90-0*0 Methoxyethene CH2CHOCH3 (g) -89.3 -106.6 ± 1.1 kJ/mol 58.0791 ± 107-25-5*0 Hydrogen iodide HI (aq, 200 H2O) -56.193 ± 0.097 kJ/mol 127.912410 ± 10034-85-2*830 Nitrato [ON(O)O]+ (g) 1290.59 1285.88 ± 0.86 kJ/mol 62.00439 ± 133057-96-2*0 2-Iminoethylium [CH2CHNH]+ (g) 1108.3 1097.6 ± 2.9 kJ/mol 42.0594 ± 73843-91-1*0 Diazanide [NH2NH]- (g) 249.3 239.3 ± 3.1 kJ/mol 31.03785 ± 25415-88-7*0 Hydrogen iodide HI (aq, 7 H2O) -51.302 ± 0.099 kJ/mol 127.912410 ± 10034-85-2*812 1-Cyanoethylidene CH3CCN (g) 437.6 433.8 ± 1.4 kJ/mol 53.0627 ± 498544-34-6*0 Hydrogen iodide HI (aq, 300 H2O) -56.273 ± 0.092 kJ/mol 127.912410 ± 10034-85-2*831 Hydrogen iodide HI (aq, 20000 H2O) -56.729 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*852 2-Iminoethylium [CH2CHNH]+ (g, triplet) 1148.7 1140.2 ± 3.3 kJ/mol 42.0594 ± 73843-91-1*1 Dichlorovinylidene CCCl2 (g) 424.3 427.6 ± 3.0 kJ/mol 94.9268 ± 20394-25-6*0 Hydroxymethoxy CH2(OH)O (g, anti) -149.9 -159.8 ± 1.8 kJ/mol 47.0333 ± 72144-78-6*1 Isoformyl anion [COH]- (g) 55.7 58.4 ± 1.8 kJ/mol 29.01859 ± 81747-63-9*0 Hydroxymethoxy cation [CH2(OH)O]+ (g, triplet) 925.0 915.2 ± 3.2 kJ/mol 47.0328 ± 180071-69-6*1 3-Imino-2-propen-1-ylidene CHCHCNH (g) 530.7 526.4 ± 1.2 kJ/mol 53.0627 ± 916765-05-4*0 Chlorovinylidene CCHCl (g) 429.2 430.9 ± 2.9 kJ/mol 60.4820 ± 70277-82-6*0 3-Imino-2-propen-1-ylidene CHCHCNH (g, triplet) 571.8 567.0 ± 1.6 kJ/mol 53.0627 ± 916765-05-4*2 Fluoroimidogen NF (g) 232.64 232.64 ± 0.80 kJ/mol 33.005143 ± 13967-06-1*0 Hydroxymethoxy cation [CH2(OH)O]+ (g, triplet syn) 930.9 921.4 ± 3.7 kJ/mol 47.0328 ± 180071-69-6*12 Hydrogen fluoride HF (aq, 800 H2O) -322.57 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*837 Hydroxymethoxy cation [CH2(OH)O]+ (g, triplet anti) 933.4 923.8 ± 3.7 kJ/mol 47.0328 ± 180071-69-6*11 2-(Methylidyneamino)ethenyl CHCHNCH (g) 600.7 596.4 ± 1.2 kJ/mol 53.0627 ± 123416-74-0*0 Cyanogen bromide cation [BrCN]+ (g) 1331.3 1325.0 ± 1.4 kJ/mol 105.9209 ± 34749-77-4*0 2-(Methylidyneamino)ethenyl CHCHNCH (g, triplet) 634.5 630.4 ± 1.6 kJ/mol 53.0627 ± 123416-74-0*2 Hydroxymethoxy anion [CH2(OH)O]- (g) -373.82 -383.76 ± 0.85 kJ/mol 47.0339 ± 67899-36-9*0 Hydrogen fluoride HF (aq, 200 H2O) -322.08 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*830 Dinitrogen tetraoxide O2NNO2 (cr,l) -37.85 -27.00 ± 0.19 kJ/mol 92.0111 ± 10544-72-6*500 Hydroxymethoxy anion [CH2(OH)O]- (g, anti) -349.1 -358.7 ± 1.9 kJ/mol 47.0339 ± 67899-36-9*1 Difluorodioxidane anion [FOOF]- (g) -251. -251. ± 28. kJ/mol 69.99615 ± *7783-45-1*0 Hydrogen iodide HI (aq, 1500 H2O) -56.519 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*840 Tetraiodomethane CI4 (cr, monoclinic) 237. ± 11. kJ/mol 519.62858 ± 507-25-5*500 Hydrogen iodide HI (aq, 400 H2O) -56.319 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*832 Hydrogen bromide HBr (aq, 800 H2O) -120.07 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*837 Hydrogen fluoride HF (aq, 4000 H2O) -324.14 ± 0.13 kJ/mol 20.006343 ± 7664-39-3*843 Fluoromethane cation [CH3F]+ (g) 981.81 974.31 ± 0.62 kJ/mol 34.03237 ± 59122-96-2*0 Hydrogen fluoride HF (aq, 250 H2O) -322.12 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*908 2-Iminoethyl anion [CH2CHNH]- (g) 104.5 94.1 ± 2.1 kJ/mol 42.0604 ± 73843-87-5*0 2-Cyanovinyl CHCHCN (g) 447.83 445.43 ± 0.98 kJ/mol 52.0547 ± 189141-20-6*0 2-Cyanovinylium [CHCHCN]+ (g, triplet) 1517.3 1515.2 ± 1.8 kJ/mol 52.0542 ± 85398-67-0*2 2-Cyanovinyl anion [CHCHCN]- (g) 263.7 261.4 ± 1.8 kJ/mol 52.0553 ± *85398-67-0*0 Hydrogen fluoride HF (aq, 10000 H2O) -325.42 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*850 Hydrogen fluoride HF (aq, 264.3 H2O) -322.13 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*909 2-Isocyanovinyl CHCHNC (g) 543.2 541.8 ± 1.7 kJ/mol 52.0547 ± 225798-14-1*0 Chlorous acid anion [HOClO]- (g) -154.3 -156.1 ± 3.3 kJ/mol 68.4600 ± 99559-66-7*0 Hydrogen iodide HI (aq, 5 H2O) -47.73 ± 0.32 kJ/mol 127.912410 ± 10034-85-2*809 Cyanomethyliumyl [HCCN]+ (g) 1506.4 1507.9 ± 2.3 kJ/mol 39.0355 ± 34447-38-6*0 Cyanomethylene anion [HCCN]- (g) 286.3 286.8 ± 1.5 kJ/mol 39.0366 ± 12373-24-9*0 Cyanomethylene HCCN (g) 479.6 483.0 ± 1.1 kJ/mol 39.0361 ± 2612-62-6*0 Methoxyethene CH2CHOCH3 (g, trans) -81.9 -99.0 ± 2.4 kJ/mol 58.0791 ± 107-25-5*1 Ethoxyethene CH2CHOCH2CH3 (g) -117.8 -136.3 ± 1.5 kJ/mol 72.1057 ± 109-92-2*0 Isocyanomethyliumyl [HCNC]+ (g) 1506.7 1508.6 ± 3.2 kJ/mol 39.0355 ± 99045-54-2*0 Isocyanomethylene anion [HCNC]- (g) 401.3 402.0 ± 2.0 kJ/mol 39.0366 ± 144141-01-5*0 Isocyanomethylene HCNC (g) 583.1 585.3 ± 1.6 kJ/mol 39.0361 ± 78694-65-2*0 Hydroperoxonium [H2OOH]+ (g, cis) 762.6 752.7 ± 2.0 kJ/mol 35.02207 ± 70850-26-9*2 3-Oxo-1,2-propadien-1-ylium-1-yl [CCCO]+ (g) 1380.4 1385.7 ± 3.8 kJ/mol 52.0310 ± 151455-13-9*0 3-Oxo-1,2-propadienylidene anion [CCCO]- (g) 224.4 230.2 ± 3.5 kJ/mol 52.0320 ± 109292-50-4*0 Fluoromethane CH3F (l) -245.75 ± 0.45 kJ/mol 34.03292 ± 593-53-3*590 1-Iminoethyl CH3CNH (g) 233.1 223.0 ± 1.1 kJ/mol 42.0599 ± 128365-64-0*0 1-Iminoethyl CH3CNH (g, syn) 252.3 242.4 ± 2.0 kJ/mol 42.0599 ± 128365-64-0*1 Acetic acid CH3C(O)OH (aq, 200 H2O) -484.74 ± 0.33 kJ/mol 60.0520 ± 64-19-7*830 Chloromethane CH3Cl (l) -106.46 -102.50 ± 0.17 kJ/mol 50.4872 ± 74-87-3*590 1-Iminoethylium [CH3CNH]+ (g) 833.7 823.2 ± 3.0 kJ/mol 42.0594 ± *128365-64-0*0 1-Iminoethylium [CH3CNH]+ (g, triplet) 1342.2 1333.3 ± 3.9 kJ/mol 42.0594 ± *128365-64-0*1 2-Hydroxyethyl CH2CH2OH (g) -12.90 -26.17 ± 0.48 kJ/mol 45.0605 ± 4422-54-2*0 Carbon dianion [C]-2 (g) 1027.5 1033.0 ± 4.9 kJ/mol 12.01180 ± 50802-47-6*0 1-Iminoethylium [CH3CNH]+ (g, syn-triplet) 1378.3 1368.8 ± 4.3 kJ/mol 42.0594 ± *128365-64-0*11 Hydrogen chloride HCl (aq, 2400 H2O) -166.709 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*896 1,3-Cyclobutadiene cation [CH(CHCHCH)]+ (g) 1215.5 1207.2 ± 3.0 kJ/mol 52.0740 ± 34531-09-4*0 Bromomethane cation [CH3Br]+ (g) 996.63 981.72 ± 0.20 kJ/mol 94.9380 ± 12538-70-4*0 Water H2O (g, ortho) -238.622 -241.810 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*1 2-Methyl-2-cyclopropen-1-ylidene CH3C(CHC) (g) 448.1 441.9 ± 1.2 kJ/mol 52.0746 ± 185841-59-2*0 2-Methyl-2-cyclopropen-1-ylidene CH3C(CHC) (g, triplet) 670.7 664.7 ± 2.8 kJ/mol 52.0746 ± 185841-59-2*1 Hydrazine anion [NH2NH2]- (g) 232.3 218.0 ± 4.1 kJ/mol 32.04579 ± 65391-88-0*0 1-Iminoethanide [CH3CNH]- (g) 185.7 175.6 ± 3.2 kJ/mol 42.0604 ± *128365-65-1*0 Ammonium hydroxide NH4OH (aq, 25 H2O) -366.25 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*819 1-Iminoethanide [CH3CNH]- (g, syn) 193.2 182.6 ± 3.6 kJ/mol 42.0604 ± *128365-65-1*1 Hydrogen fluoride HF (aq, 20000 H2O) -326.65 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*852 Carbon trianion [C]-3 (g) 1813.2 1818.6 ± 5.9 kJ/mol 12.01235 ± 50802-48-7*0 Vinylvinylidene CH2CHCHC (g) 494.2 488.8 ± 1.7 kJ/mol 52.0746 ± 148759-16-4*0 Vinylvinylidene CH2CHCHC (g, triplet) 690.5 684.7 ± 2.6 kJ/mol 52.0746 ± 148759-16-4*1 Ethoxyethene CH2CHOCH2CH3 (g, cis-perp) -111.3 -135.2 ± 2.3 kJ/mol 72.1057 ± 109-92-2*21 Vinylvinylidene CH2CHCHC (g, triplet, cis) 695.4 689.0 ± 3.3 kJ/mol 52.0746 ± 148759-16-4*12 Vinylvinylidene cation [CH2CHCHC]+ (g) 1429.9 1424.6 ± 2.0 kJ/mol 52.0740 ± 161054-20-2*0 Vinylvinylidene cation [CH2CHCHC]+ (g, cis) 1437.9 1432.2 ± 2.7 kJ/mol 52.0740 ± 161054-20-2*2 Vinylvinylidene anion [CH2CHCHC]- (g) 405.7 399.0 ± 2.0 kJ/mol 52.0751 ± 167386-49-4*0 Vinylvinylidene anion [CH2CHCHC]- (g, cis) 423.2 416.7 ± 2.7 kJ/mol 52.0751 ± 167386-49-4*2 Tetroxidane HOOOOH (g, C2 II) -30.97 -41.43 ± 0.64 kJ/mol 66.0135 ± 29683-94-1*23 Carbon C (diamond) 2.389 1.861 ± 0.043 kJ/mol 12.01070 ± 7440-44-0*501 1,2-Butadien-1-ylidene CH3CHCC (g) 511.8 506.3 ± 2.0 kJ/mol 52.0746 ± 119908-55-3*0 1,2-Butadien-1-ylidene CH3CHCC (g, triplet) 651.7 646.2 ± 3.7 kJ/mol 52.0746 ± 119908-55-3*1 Ethylperoxy CH3CH2OO (g) -6.13 -22.10 ± 0.62 kJ/mol 61.0599 ± 3170-61-4*0 Difluorodinitrate [FNNF]- (g, trans) -207.8 -206.6 ± 4.7 kJ/mol 66.01083 ± 37366-65-7*1 Ethoxyoxoniumylidene [CH3CH2OO]+ (g) 923.9 911.6 ± 1.5 kJ/mol 61.0594 ± 268728-77-4*0 Iodomethane cation [CH3I]+ (g) 944.76 935.36 ± 0.17 kJ/mol 141.93844 ± 12538-72-6*0 Hydroxyamidogen HNOH (g) 101.27 94.43 ± 0.83 kJ/mol 32.02202 ± 13940-32-4*0 Ethoxyethene CH2CHOCH2CH3 (g, trans-trans) -110.8 -133.0 ± 2.6 kJ/mol 72.1057 ± 109-92-2*1 Hydrogen bromide HBr (aq, 900 H2O) -120.09 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*838 Ethoxyoxoniumylidene [CH3CH2OO]+ (g, singlet) 962.5 947.8 ± 1.7 kJ/mol 61.0594 ± 268728-77-4*2 Ethoxyoxoniumylidene [CH3CH2OO]+ (g, gauche singlet) 967.6 951.7 ± 2.4 kJ/mol 61.0594 ± 268728-77-4*23 1,2,3-Butatrien-1-ylium [CH2CCCH]+ (g) 1271.9 1270.1 ± 1.1 kJ/mol 51.0661 ± 81932-79-8*0 Hydrogen bromide HBr (aq, 1000 H2O) -120.11 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*839 1,2-Butadiene CH3CHCCH2 (cr,l) 137.80 138.86 ± 0.63 kJ/mol 54.0904 ± 590-19-2*500 Ethaneperoxolate [CH3CH2OO]- (g) -120.36 -136.42 ± 0.70 kJ/mol 61.0604 ± 268728-75-2*0 Ethenol CH2CHOH (g) -113.28 -123.63 ± 0.37 kJ/mol 44.0526 ± 557-75-5*0 Nitric acid HON(O)O (aq, 2 H2O) -193.75 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*803 Fluorosyl fluoride cation [FFO]+ (g) 1413.1 1413.4 ± 3.5 kJ/mol 53.99566 ± *86825-50-5*0 1-Buten-3-yn-1-yl HCCCHCH (g) 547.36 544.85 ± 0.84 kJ/mol 51.0666 ± 2810-61-9*0 1-Buten-3-ynylium [HCCCHCH]+ (g) 1482.4 1480.3 ± 1.4 kJ/mol 51.0661 ± 84654-85-3*0 But-1-en-3-yn-1-ide [HCCCHCH]- (g) 419.8 419.2 ± 1.2 kJ/mol 51.0672 ± 119611-65-3*0 Ethaneperoxolate [CH3CH2OO]- (g, trans) -119.8 -135.5 ± 1.9 kJ/mol 61.0604 ± 268728-75-2*1 Fluoroform CHF3 (l) -704.71 ± 0.42 kJ/mol 70.01385 ± 75-46-7*590 Cyclopropane CH2(CH2CH2) (l) 41.49 35.80 ± 0.47 kJ/mol 42.0797 ± 75-19-4*500 Diazomethyl HCNN (g) 467.84 465.28 ± 0.68 kJ/mol 41.03212 ± 20813-32-5*0 3-Buten-1-ynylium [CH2CHCC]+ (g) 1572.7 1570.3 ± 1.7 kJ/mol 51.0661 ± 103928-84-3*0 But-3-en-1-yn-1-ide [CH2CHCC]- (g) 326.8 323.7 ± 1.3 kJ/mol 51.0672 ± 58870-47-6*0 Hydrogen iodide HI (aq, 500 H2O) -56.356 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*833 Nitrilomethylimidogen NCHN (g) 581.6 578.4 ± 1.5 kJ/mol 41.03212 ± 324529-58-0*0 1-Hydroperoxyethylium [CH3CHOOH]+ (g) 690.7 675.8 ± 1.5 kJ/mol 61.0594 ± *126898-98-4*0 Peroxyformic acid HC(O)OOH (g) -279.23 -288.37 ± 0.63 kJ/mol 62.0248 ± 107-32-4*0 3-Methylene-1-cyclopropen-1-ylium [CH2C(CHC)]+ (g) 1398.8 1395.5 ± 1.7 kJ/mol 51.0661 ± 117469-28-0*0 Hydrogen chloride HCl (aq, 50000 H2O) -166.923 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*855 Difluorodioxidanium [FOOF]+ (g) 1283.7 1280.1 ± 2.3 kJ/mol 69.99506 ± *7783-44-0*0 N-Methylenemethaniminium [CH2NCH2]+ (g) 904.3 893.4 ± 3.1 kJ/mol 42.0594 ± 88333-01-1*0 2-Cyclopropen-1-ylidenemethylium [CHC(CHCH)]+ (g) 1346.5 1343.9 ± 1.8 kJ/mol 51.0661 ± 112936-36-4*0 Ammonium hydroxide NH4OH (aq, 30 H2O) -366.26 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*820 1-Hydroperoxyethylium [CH3CHOOH]+ (g, triplet) 841.5 830.3 ± 1.7 kJ/mol 61.0594 ± *126898-98-4*1 N-Methylenemethaniminium [CH2NCH2]+ (g, triplet) 1157.2 1147.3 ± 4.0 kJ/mol 42.0594 ± 88333-01-1*1 Nitrogen atom heptacation [N]+7 (g) 143853.27 143855.13 ± 0.23 kJ/mol 14.002900 ± 40549-08-4*0 1,3-Cyclobutadien-1-ylium [C(CHCHCH)]+ (g) 1388.3 1383.4 ± 1.8 kJ/mol 51.0661 ± 81913-77-1*0 N-Methylidynemethanaminium [CH3NCH]+ (g) 881.1 870.2 ± 3.0 kJ/mol 42.0594 ± 64709-60-0*0 Nitric acid HON(O)O (aq, 4 H2O) -200.30 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*807 Ethoxyethene CH2CHOCH2CH3 (g, trans-perp) -108.7 -132.0 ± 2.3 kJ/mol 72.1057 ± 109-92-2*11 Cyclobutenide [CH2(CHCHCH)]- (g) 320.4 307.9 ± 3.2 kJ/mol 53.0830 ± 60211-42-9*0 1-Hydroperoxyethylium [CH3CHOOH]+ (g, cis singlet) 692.0 676.3 ± 2.3 kJ/mol 61.0594 ± *126898-98-4*22 1-Hydroperoxyethylium [CH3CHOOH]+ (g, cis triplet) 843.8 831.8 ± 2.6 kJ/mol 61.0594 ± *126898-98-4*12 (Methylimino)methyl CH3NCH (g) 278.0 267.9 ± 1.1 kJ/mol 42.0599 ± 117928-23-1*0 Ammonium hydroxide NH4OH (aq, 40 H2O) -366.31 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*821 Phenylperoxy cation [C6H5OO]+ (g) 1019.0 1002.0 ± 3.1 kJ/mol 109.1022 ± 956036-17-2*0 Phenylperoxy anion [C6H5OO]- (g) -38.8 -55.8 ± 3.3 kJ/mol 109.1032 ± *956036-17-2*0 Iodotrifluoromethane cation [CF3I]+ (g) 412.8 407.5 ± 2.6 kJ/mol 195.90983 ± 64626-54-6*0 Nitric acid HON(O)O (aq, 5 H2O) -201.96 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*809 Hypobromous acid cation [HOBr]+ (g) 975.25 964.63 ± 0.54 kJ/mol 96.9108 ± 154804-02-1*0 Tetrafluorohydrazine cation [NF2NF2]+ (g, cis ?) 1146.9 1141.5 ± 3.7 kJ/mol 104.00654 ± 37366-75-9*2 Hydrogen chloride HCl (aq, 3000 H2O) -166.739 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*842 Fulvene cation [CH2C(CHCHCHCH)]+ (g) 1043.6 1027.9 ± 2.7 kJ/mol 78.1113 ± 34504-75-1*0 Fulvene anion [CH2C(CHCHCHCH)]- (g) 191.4 176.3 ± 4.0 kJ/mol 78.1124 ± 34504-63-7*0 (Methylimino)methyl CH3NCH (g, cis) 297.1 287.1 ± 2.0 kJ/mol 42.0599 ± 117928-23-1*2 2-Hydroperoxyethyl CH2CH2OOH (g) 64.7 51.4 ± 1.3 kJ/mol 61.0599 ± 126898-97-3*0 cis-1,3,5-Hexatriene CH2CHCHCHCHCH2 (g, cis) 190.6 170.6 ± 2.9 kJ/mol 80.1277 ± 2612-46-6*0 2-Hydroperoxyethyl CH2CH2OOH (g, gauche) 64.7 51.0 ± 1.3 kJ/mol 61.0599 ± 126898-97-3*3 2-Butynylium [CH3CCCH2]+ (g) 1085.9 1077.6 ± 1.3 kJ/mol 53.0820 ± 64235-83-2*0 2-Hydroperoxyethyl CH2CH2OOH (g, anti) 65.2 51.8 ± 2.2 kJ/mol 61.0599 ± 126898-97-3*1 Iminomethylimidogen anion [NCHN]- (g) 401.9 400.0 ± 2.3 kJ/mol 41.03267 ± 150296-30-3*0 Fulvenone cation [OCC(CHCHCHCH)]+ (g) 913.5 903.3 ± 1.9 kJ/mol 92.0948 ± 884319-80-6*0 Hydrogen iodide HI (aq, 20 H2O) -55.08 ± 0.12 kJ/mol 127.912410 ± 10034-85-2*818 Acetic acid CH3C(O)OH (aq, 300 H2O) -484.76 ± 0.33 kJ/mol 60.0520 ± 64-19-7*831 Hydrogen fluoride HF (aq, 15 H2O) -321.78 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*817 Silicon atom tetracation [Si]+4 (g) 10401.10 10404.08 ± 0.56 kJ/mol 28.08331 ± 22537-24-2*0 Silicon anion Si- (g) 316.28 319.26 ± 0.56 kJ/mol 28.08605 ± 14337-02-1*0 Oxoiodonium [IO]+ (g) 1065.2 1063.2 ± 1.5 kJ/mol 142.90332 ± 81182-81-2*0 (Methylimino)methanide [CH3NCH]- (g) 223.0 212.2 ± 3.2 kJ/mol 42.0604 ± *64709-60-0*0 Disilicon anion [Si2]- (g) 375.1 379.0 ± 1.7 kJ/mol 56.17155 ± 64236-73-3*0 Nitric acid HON(O)O (aq, 7 H2O) -203.79 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*812 (Methylimino)methanide [CH3NCH]- (g, cis) 236.6 225.7 ± 3.6 kJ/mol 42.0604 ± *64709-60-0*2 Hydrogen iodide HI (aq, 6 H2O) -49.963 ± 0.095 kJ/mol 127.912410 ± 10034-85-2*811 Dinitrogen anion [N2]- (g) 192.5 192.5 ± 1.7 kJ/mol 28.01403 ± 12185-02-3*0 Oxoniumyl ion [H2O]+ (g, para) 978.741 975.590 ± 0.024 kJ/mol 18.01473 ± 56583-62-1*2 Bromoform CHBr3 (l) 8.73 ± 0.72 kJ/mol 252.7306 ± 75-25-2*590 2-Hydroperoxyethyl CH2CH2OOH (g, gauche-anti) 65.7 51.7 ± 2.2 kJ/mol 61.0599 ± 126898-97-3*31 Hydrogen iodide HI (aq, 555.1 H2O) -56.377 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*895 Water anion [H2O]- (g) -50.1 -53.0 ± 4.3 kJ/mol 18.01583 ± 12259-30-2*0 1-Aminoethenylium [CH2CNH2]+ (g) 900.0 889.2 ± 3.0 kJ/mol 42.0594 ± *139597-26-5*0 Difluoromethane CH2F2 (l) -468.92 ± 0.37 kJ/mol 52.02339 ± 75-10-5*590 2-Hydroperoxyethyl CH2CH2OOH (g, anti-syn) 65.7 52.1 ± 2.2 kJ/mol 61.0599 ± 126898-97-3*12 Silicon carbide anion [SiC]- (g) 508.8 513.4 ± 4.3 kJ/mol 40.09675 ± 86017-99-4*0 Acetic acid CH3C(O)OH (aq, 400 H2O) -484.78 ± 0.33 kJ/mol 60.0520 ± 64-19-7*832 1-Aminoethenide [CH2CNH2]- (g) 216.0 205.2 ± 3.2 kJ/mol 42.0604 ± 139597-26-5*0 Silicon carbide SiC (cr,l) -70.6 -71.6 ± 1.5 kJ/mol 40.09620 ± 409-21-2*500 Methylaminyliumyl [CH3N]+ (g, quartet) 1423.0 1416.0 ± 2.2 kJ/mol 29.04071 ± 56924-51-7*2 Ammonium hydroxide NH4OH (aq, 55.51 H2O) -366.33 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*891 1-Methylene-2-propenylium [CH2CHCCH2]+ (g) 1059.5 1049.3 ± 1.7 kJ/mol 53.0820 ± 62698-26-4*0 Trifluorosilyl anion [SiF3]- (g) -1225.8 -1229.1 ± 3.4 kJ/mol 85.08126 ± 54711-93-2*0 Nitrous oxide NNO (aq, undissoc) 61.42 ± 0.11 kJ/mol 44.01288 ± 10024-97-2*1000 Acetic acid CH3C(O)OH (aq, 500 H2O) -484.79 ± 0.33 kJ/mol 60.0520 ± 64-19-7*833 Difluorosilylene anion [SiF2]- (g) -652.8 -653.1 ± 3.4 kJ/mol 66.08285 ± 145089-80-1*0 Difluorosilylene SiF2 (g) -629.1 -630.0 ± 1.3 kJ/mol 66.08231 ± 13966-66-0*0 Difluorosilylene SiF2 (g, triplet) -314.3 -314.9 ± 1.3 kJ/mol 66.08231 ± 13966-66-0*1 Hypochloroperoxoous acid, hydroxy ester HOOOCl (g) 48.4 41.6 ± 1.8 kJ/mol 84.4588 ± 928652-99-7*0 Peroxyformyl HC(O)OO (g) -100.42 -105.53 ± 0.67 kJ/mol 61.0168 ± 56240-83-6*0 Vinyl alcohol cation [CH2CHOH]+ (g) 778.6 767.7 ± 1.3 kJ/mol 44.0520 ± 57239-63-1*0 Ethenyldioxy CH2CHOO (g) 118.6 109.7 ± 1.1 kJ/mol 59.0440 ± 88181-72-0*0 Fluorosilylidyne SiF (g, quartet) 297.19 298.41 ± 0.62 kJ/mol 47.08390 ± 11128-24-8*2 Hydrogen bromide HBr (aq, 50 H2O) -119.11 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*822 Trihydrogen H(HH) (g, TS) 477.4 474.7 ± 2.3 kJ/mol 3.02382 ± 12184-91-7*201 Ethenyldioxy CH2CHOO (g, syn) 122.8 113.0 ± 2.1 kJ/mol 59.0440 ± 88181-72-0*2 Dioxodiazoxane ONONO (g) 93.0 88.1 ± 1.3 kJ/mol 76.01168 ± 122413-35-8*0 Ethylene anion [CH2CH2]- (g) 232.0 225.6 ± 2.0 kJ/mol 28.0537 ± 34527-91-8*0 Trioxygen difluoride FOOOF (g, cis) 113.6 107.8 ± 2.0 kJ/mol 85.99501 ± 16829-28-0*2 Peroxyformate [HC(O)OO]- (g) -340.95 -346.40 ± 0.80 kJ/mol 61.0174 ± 104960-05-6*0 Hydrogen iodide HI (aq, 50000 H2O) -56.762 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*855 Hydrogen chloride HCl (aq, 10 H2O) -161.149 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*815 Silylene SiH2 (g) 271.60 269.94 ± 0.81 kJ/mol 30.10138 ± 13825-90-6*0 Dioxohydrazine ONNO (g, trans) 192.3 188.7 ± 1.8 kJ/mol 60.01228 ± 16824-89-8*1 Diazene HNNH (g, trans-cis-iso equilib) 207.17 200.03 ± 0.40 kJ/mol 30.02936 ± 3618-05-1*0 Nitric acid HON(O)O (aq, 10 H2O) -205.01 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*815 Disilane cation [SiH3SiH3]+ (g) 1030.2 1017.4 ± 2.2 kJ/mol 62.21809 ± 96301-43-8*0 Hydrogen chloride HCl (aq, 3500 H2O) -166.753 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*899 Diazomethyl HCNN (g, quartet) 652.7 649.8 ± 1.3 kJ/mol 41.03212 ± 20813-32-5*2 Acetic acid CH3C(O)OH (aq, 555.1 H2O) -484.79 ± 0.33 kJ/mol 60.0520 ± 64-19-7*895 Acetic acid CH3C(O)OH (aq, 600 H2O) -484.80 ± 0.33 kJ/mol 60.0520 ± 64-19-7*834 2-Aminoethenyl CHCHNH2 (g) 319.8 310.2 ± 1.3 kJ/mol 42.0599 ± 176964-54-8*0 Chlorine atom Cl (g, 2P1/2) 130.176 131.783 ± 0.0011 kJ/mol 35.45270 ± 22537-15-1*2 Diazenide [NNH]- (g) 175.6 176.7 ± 1.6 kJ/mol 29.02197 ± 71004-29-0*0 Ketene CH2CO (g, ortho singlet) -45.22 -48.40 ± 0.11 kJ/mol 42.0367 ± 463-51-4*22 Disilene SiH2SiH2 (g) 288.8 280.2 ± 1.7 kJ/mol 60.20276 ± 15435-77-5*0 Hydrogen iodide HI (aq, 3000 H2O) -56.599 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*842 Ammonium hydroxide NH4OH (aq, 75 H2O) -366.35 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*825 2-Aminoethenylium [CHCHNH2]+ (g, triplet) 1110.6 1099.8 ± 2.4 kJ/mol 42.0594 ± 64724-21-6*1 Hydrogen bromide HBr (aq, 55.51 H2O) -119.19 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*891 Silylsilylene SiH3SiH (g) 317.3 309.5 ± 1.9 kJ/mol 60.20276 ± 50420-90-1*0 Hydrogen chloride HCl (aq, 30 H2O) -164.501 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*820 Acetic acid CH3C(O)OH (aq, 700 H2O) -484.80 ± 0.33 kJ/mol 60.0520 ± 64-19-7*835 2-Aminoethenyl anion [CHCHNH2]- (g) 230.2 219.4 ± 2.6 kJ/mol 42.0604 ± *64724-21-6*0 Aminomethylidyne anion [CNH2]- (g, triplet) 481.6 478.1 ± 3.2 kJ/mol 28.03387 ± 96808-04-7*1 1,2-Butadienylium [CH3CHCCH]+ (g) 1099.2 1089.9 ± 1.2 kJ/mol 53.0820 ± *65114-67-2*0 Hydrogen fluoride HF (aq, 700 H2O) -322.50 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*835 Diazene cation [HNNH]+ (g, trans-iso-cis equilib) 1132.53 1125.87 ± 0.64 kJ/mol 30.02881 ± 76986-17-9*0 1,3-Propanediyl CH2CH2CH2 (g, triplet) 319.3 307.9 ± 1.3 kJ/mol 42.0797 ± 32458-33-6*1 Di-mu-hydrodihydrodisilicon HSi(HSiHH) (g) 374.8 364.5 ± 2.3 kJ/mol 60.20276 ± 129970-82-7*0 Di-mu-hydrodihydrodisilicon HSi(HSiHH) (g, trans) 374.8 364.4 ± 2.3 kJ/mol 60.20276 ± 129970-82-7*1 Di-mu-hydrodihydrodisilicon HSi(HSiHH) (g, trans-triplet) 544.3 536.2 ± 3.6 kJ/mol 60.20276 ± 129970-82-7*11 Di-mu-hydrodihydrodisilicon cation [HSi(HSiHH)]+ (g) 1180.3 1172.7 ± 3.2 kJ/mol 60.20221 ± *129970-82-7*0 Di-mu-hydrodihydrodisilicon anion [HSi(HSiHH)]- (g) 288.5 280.4 ± 3.3 kJ/mol 60.20331 ± *129970-83-8*0 2-Hydroxyethylium [CH2CH2OH]+ (g) 1019.3 1007.2 ± 1.5 kJ/mol 45.0600 ± 38607-31-7*0 Acetic acid CH3C(O)OH (aq, 800 H2O) -484.80 ± 0.33 kJ/mol 60.0520 ± 64-19-7*837 Hydrogen bromide HBr (aq, 1500 H2O) -120.17 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*840 Hydrogen chloride HCl (aq, 4000 H2O) -166.764 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*843 Ammonium hydroxide NH4OH (aq, 3000 H2O) -366.35 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*842 Hydrogen fluoride HF (aq, 45 H2O) -321.94 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*906 Acetic acid CH3C(O)OH (aq, 900 H2O) -484.81 ± 0.33 kJ/mol 60.0520 ± 64-19-7*838 Nitric acid HON(O)O (aq, 15 H2O) -205.70 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*817 Ethylimidogen anion [CH3CH2N]- (g) 277.3 263.4 ± 3.6 kJ/mol 43.0684 ± 82539-33-1*0 Hydrogen chloride HCl (aq, 50 H2O) -165.187 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*822 Tetraoxidanyl HOOOO (g) 2.1 0.4 ± 2.9 kJ/mol 65.0055 ± 69696-93-1*0 Hydrogen bromide HBr (aq, 2000 H2O) -120.21 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*841 Hydrogen bromide HBr (aq, 2500 H2O) -120.24 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*898 Formic acid cation [HC(O)OH]+ (g) 721.94 715.41 ± 0.25 kJ/mol 46.0248 ± 50614-05-6*0 Formic acid anion [HC(O)OH]- (g) -256.2 -262.3 ± 1.8 kJ/mol 46.0259 ± 19066-82-1*0 Ethylideneoxoniumyloxy [CH3CHOO]+ (g) 950.7 939.0 ± 2.3 kJ/mol 60.0514 ± 1427752-17-7*0 Ammonium hydroxide NH4OH (aq, 200 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*830 Peroxychlorous acid HOOClO (g) 95.4 89.8 ± 2.0 kJ/mol 84.4588 ± 177778-92-6*0 Hydrazoic acid HNNN (cr,l) 261.57 ± 0.64 kJ/mol 43.02816 ± 7782-79-8*500 Hydrogen bromide HBr (aq, 4000 H2O) -120.29 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*843 Nitric acid HON(O)O (aq, 20 H2O) -205.93 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*818 Ethylimidogen cation [CH3CH2N]+ (g, quartet) 1394.6 1381.3 ± 3.6 kJ/mol 43.0673 ± *82539-33-1*1 Vinyl hydroperoxide CH2CHOOH (g) -25.09 -35.86 ± 0.96 kJ/mol 60.0520 ± 66998-78-5*0 Hydrogen chloride HCl (aq, 5000 H2O) -166.794 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*844 Propylidene CH3CH2CH (g) 349.49 335.80 ± 0.92 kJ/mol 42.0797 ± 6700-78-3*0 Hydrogen iodide HI (aq, 600 H2O) -56.390 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*834 Hydroxyaminylium [HNOH]+ (g) 1019.5 1012.3 ± 2.5 kJ/mol 32.02147 ± 66097-71-0*0 Hydrogen cyanide anion [HCN]- (g) 129.525 129.047 ± 0.087 kJ/mol 27.02593 ± 12334-27-9*0 1-Aziridinylium [N(CH2CH2)]+ (g, triplet) 1265.9 1254.2 ± 3.1 kJ/mol 42.0594 ± 91127-35-4*1 Hydroxysilyl anion [SiH2OH]- (g) -219.2 -227.0 ± 2.1 kJ/mol 47.10927 ± 78450-47-2*0 Hydroxysilyl anion [SiH2OH]- (g, anti) -218.9 -226.8 ± 2.7 kJ/mol 47.10927 ± 78450-47-2*2 Hydrogen bromide HBr (aq, 7000 H2O) -120.34 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*846 Formate [HC(O)O]- (aq) -425.48 ± 0.45 kJ/mol 45.0180 ± 71-47-6*800 Ammonium hydroxide NH4OH (aq, 300 H2O) -366.39 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*831 Nitric acid HON(O)O (aq, 25 H2O) -206.01 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*819 Benzvalene cation [((CHCH)(CH(CHCH)CH))]+ (g) 1200.2 1184.8 ± 2.7 kJ/mol 78.1113 ± 81050-63-7*0 Ethylidene CH3CH (g) 361.29 354.30 ± 0.48 kJ/mol 28.0532 ± 4218-50-2*0 Trihydrogen cation [H3]+ (g, ortho) 1110.577 1106.695 ± 0.013 kJ/mol 3.02327 ± 28132-48-1*1 1-Aziridinide [N(CH2CH2)]- (g) 244.2 231.8 ± 3.3 kJ/mol 42.0604 ± 1358579-49-3*0 Diazomethyl HCNN (g, t-quartet) 653.0 650.0 ± 2.3 kJ/mol 41.03212 ± 20813-32-5*21 Acetic acid CH3C(O)OH (aq, 1000 H2O) -484.81 ± 0.33 kJ/mol 60.0520 ± 64-19-7*839 Hydrogen bromide HBr (aq, 75 H2O) -119.36 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*825 1H-Diazirin-3-ylium [HN(NC)]+ (g) 1527.2 1523.7 ± 2.0 kJ/mol 41.03157 ± 735234-64-7*0 Hydrogen chloride HCl (aq, 12 H2O) -162.011 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*816 Ammonium hydroxide NH4OH (aq, 400 H2O) -366.39 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*832 2-Methyl-2-propanol (CH3)3COH (cr,l) -341.1 -365.6 ± 1.9 kJ/mol 74.1216 ± 75-65-0*500 Dicarbon monoxide CCO (g) 377.12 381.16 ± 0.83 kJ/mol 40.0208 ± 12071-23-7*0 Butadienylacetylene CH2CHCHCHCCH (g) 358.9 346.4 ± 1.9 kJ/mol 78.1118 ± 10420-90-3*0 1,3-Butadienyl CH2CHCHCH (g) 372.27 363.05 ± 0.87 kJ/mol 53.0825 ± 86181-68-2*0 (3Z)-1,3-Hexadien-5-yne CH2CHCHCHCCH (g, cis) 358.9 346.3 ± 2.5 kJ/mol 78.1118 ± 5222-76-4*0 Divinylacetylene CH2CHCCCHCH2 (g) 361.9 350.7 ± 1.9 kJ/mol 78.1118 ± 821-08-9*0 1,3-Butadienyl CH2CHCHCH (g, trans-cis) 374.9 364.5 ± 1.9 kJ/mol 53.0825 ± 86181-68-2*12 Divinylacetylene CH2CHCCCHCH2 (g, trans) 362.5 351.4 ± 2.6 kJ/mol 78.1118 ± 821-08-9*1 Biallenyl CH2CCHCHCCH2 (g) 410.6 399.6 ± 1.5 kJ/mol 78.1118 ± 29776-96-3*0 1H-diazirin-3-ide [HN(NC)]- (g) 379.8 376.6 ± 2.0 kJ/mol 41.03267 ± *735234-64-7*0 Biallenyl CH2CCHCHCCH2 (g, cis) 419.5 408.2 ± 2.2 kJ/mol 78.1118 ± 29776-96-3*2 Propargylallene CH2CCHCH2CCH (g) 431.4 420.0 ± 1.4 kJ/mol 78.1118 ± 33142-15-3*0 1,3-Butadienyl CH2CHCHCH (g, cis-trans) 384.1 374.5 ± 1.9 kJ/mol 53.0825 ± 86181-68-2*21 Propargylallene CH2CCHCH2CCH (g, cis) 432.3 420.7 ± 2.2 kJ/mol 78.1118 ± 33142-15-3*2 Formic acid HC(O)OH (aq, 0.25 H2O) -424.94 ± 0.60 kJ/mol 46.0254 ± 64-18-6*924 Formic acid HC(O)OH (aq, 0.5 H2O) -425.16 ± 0.60 kJ/mol 46.0254 ± 64-18-6*923 3-Methylene-1-penten-4-yne CH2CHC(CH2)CCH (g) 362.7 350.3 ± 2.2 kJ/mol 78.1118 ± 6929-96-0*0 3-Methylene-1-penten-4-yne CH2CHC(CH2)CCH (g, gauche) 374.8 362.5 ± 2.8 kJ/mol 78.1118 ± 6929-96-0*3 1,2,3,5-Hexatetraene CH2CCCHCHCH2 (g) 391.8 380.4 ± 1.6 kJ/mol 78.1118 ± 60239-33-0*0 Oxooxoniumylmethoxy [OC(O)O]+ (g) 1178.0 1177.3 ± 5.7 kJ/mol 60.0084 ± 952586-28-6*0 1,2,3,5-Hexatetraene CH2CCCHCHCH2 (g, cis) 400.6 389.0 ± 2.3 kJ/mol 78.1118 ± 60239-33-0*2 2-Aziridinyl NH(CHCH2) (g) 360.9 349.5 ± 1.7 kJ/mol 42.0599 ± *23838-09-7*0 Hydrogen iodide HI (aq, 100000 H2O) -56.779 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*861 1,3-Butadienyl CH2CHCHCH (g, gauche-cis) 385.6 375.4 ± 1.9 kJ/mol 53.0825 ± 86181-68-2*22 1-Propen-1-yl-3-ylidene CHCHCH (g) 656.7 653.3 ± 1.1 kJ/mol 39.0559 ± 84654-90-0*0 2-Aziridinylium [NH(CHCH2)]+ (g) 1010.9 998.9 ± 3.3 kJ/mol 42.0594 ± *91127-35-4*0 2-Propenylidene CHCHCH2 (g) 417.5 410.6 ± 1.5 kJ/mol 40.0639 ± 19527-08-3*0 Acetic acid CH3C(O)OH (aq, 2000 H2O) -484.82 ± 0.33 kJ/mol 60.0520 ± 64-19-7*841 Ammonium hydroxide NH4OH (aq, 555.1 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*895 Ammonium hydroxide NH4OH (aq, 600 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*834 Hydrogen bromide HBr (aq, 100 H2O) -119.51 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*828 Formic acid HC(O)OH (aq, 1 H2O) -425.44 ± 0.60 kJ/mol 46.0254 ± 64-18-6*801 1,3-Butadienylium [CH2CHCHCH]+ (g) 1133.7 1123.7 ± 2.5 kJ/mol 53.0820 ± 86181-69-3*0 2-Aziridinylium [NH(CHCH2)]+ (g, triplet) 1304.9 1293.2 ± 4.1 kJ/mol 42.0594 ± *91127-35-4*1 1-Methylallyl CH3CHCHCH2 (g) 152.66 136.19 ± 0.79 kJ/mol 55.0984 ± 15819-46-2*0 Cyanomethylium [CH2CN]+ (g) 1256.21 1253.57 ± 0.61 kJ/mol 40.0435 ± 34430-18-7*0 2-Aziridinylium [NH(CHCH2)]+ (g, syn-triplet) 1334.9 1323.9 ± 4.8 kJ/mol 42.0594 ± *91127-35-4*11 1-Methyl-1-propenyl CH3CCHCH3 (g) 240.10 224.72 ± 0.66 kJ/mol 55.0984 ± 71790-71-1*0 Peroxychlorous acid HOOClO (g, perp ?) 101.5 95.4 ± 3.6 kJ/mol 84.4588 ± 177778-92-6*3 1-Methyl-1-propenyl CH3CCHCH3 (g, cis) 243.4 227.1 ± 1.9 kJ/mol 55.0984 ± 71790-71-1*2 Hydrogen iodide HI (aq, 700 H2O) -56.411 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*835 1-Propen-1-yl-3-ylidene CHCHCH (g, c-t quartet) 656.7 653.2 ± 2.0 kJ/mol 39.0559 ± 84654-90-0*12 1-Butenyl CH3CH2CHCH (g) 263.46 246.40 ± 0.68 kJ/mol 55.0984 ± 2669-61-6*0 2-Aziridinide [NH(CHCH2)]- (g) 316.2 304.1 ± 3.4 kJ/mol 42.0604 ± 111127-93-6*0 1-Butenyl CH3CH2CHCH (g, gauche) 263.9 246.6 ± 1.9 kJ/mol 55.0984 ± 2669-61-6*3 Nitric acid HON(O)O (aq, 30 H2O) -206.03 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*820 1-Ethynyl-2-propyn-1-ylium-1-yl [HCCCCCH]+ (g) 1537.2 1540.8 ± 2.6 kJ/mol 62.0688 ± 217822-76-9*0 1-Ethynyl-2-propyn-1-ylidene anion [HCCCCCH]- (g) 584.2 589.3 ± 3.5 kJ/mol 62.0699 ± 217822-70-3*0 1-Ethynyl-2-propyn-1-ylidene HCCCCCH (g) 727.0 734.1 ± 1.7 kJ/mol 62.0694 ± 882068-94-2*0 1-Ethynyl-2-propyn-1-ylidene HCCCCCH (g, singlet) 787.5 792.9 ± 2.1 kJ/mol 62.0694 ± 882068-94-2*2 2-Aziridinide [NH(CHCH2)]- (g, syn) 330.1 318.1 ± 4.0 kJ/mol 42.0604 ± 111127-93-6*1 1-Propen-1-yl-3-ylidene CHCHCH (g, t-t quartet) 665.8 662.3 ± 2.0 kJ/mol 39.0559 ± 84654-90-0*13 1-Propen-1-yl-3-ylidene CHCHCH (g, doublet) 699.3 696.4 ± 3.4 kJ/mol 39.0559 ± 84654-90-0*2 Isocyanic acid anion [HNCO]- (g) -54.2 -57.4 ± 3.0 kJ/mol 43.02533 ± *444010-28-0*0 1,2-Pentadien-4-ynylidene HCCCHCC (g) 791.3 794.0 ± 2.4 kJ/mol 62.0694 ± 195524-67-5*0 2-Cyclopropen-1-ylideneethenylidene CCC(CHCH) (g) 807.2 808.8 ± 3.4 kJ/mol 62.0694 ± 195524-69-7*0 Acetic acid CH3C(O)OH (aq, 5000 H2O) -484.70 ± 0.33 kJ/mol 60.0520 ± 64-19-7*844 Nitric acid HON(O)O (aq, 50 H2O) -206.05 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*822 Hydrogen iodide HI (aq, 800 H2O) -56.432 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*837 Formic acid HC(O)OH (aq, 1.5 H2O) -425.54 ± 0.60 kJ/mol 46.0254 ± 64-18-6*802 Carbonylbis(oxy) OC(O)O (g) -144.7 -145.7 ± 2.4 kJ/mol 60.0089 ± 16518-45-9*0 Hydrogen fluoride HF (aq, 900 H2O) -322.64 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*838 Diazene HNNH (g, trans-cis equilib) 207.17 200.03 ± 0.40 kJ/mol 30.02936 ± 3618-05-1*1 Nitric acid HON(O)O (aq, 55.51 H2O) -206.04 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*891 2,4-Pentadiynylium [HCCCCCH2]+ (g) 1362.5 1362.6 ± 2.6 kJ/mol 63.0768 ± 103928-86-5*0 Pentatetraen-1-ide [HCCCCCH2]- (g) 433.4 433.9 ± 3.4 kJ/mol 63.0779 ± 849427-36-7*0 1-Ethynyl-2-propynylium [CHCCHCCH]+ (g) 1379.9 1378.7 ± 2.6 kJ/mol 63.0768 ± 79530-50-0*0 Hydrogen bromide HBr (aq, 3 H2O) -102.21 ± 0.13 kJ/mol 80.9119 ± 10035-10-6*805 Penta-1,4-diyn-3-ide [CHCCHCCH]- (g) 443.9 443.2 ± 3.2 kJ/mol 63.0779 ± 553662-77-4*0 Penta-1,4-diyn-3-ide [CHCCHCCH]- (g, anti) 443.9 443.2 ± 3.6 kJ/mol 63.0779 ± 553662-77-4*2 (Dimethylamino)methyl anion [(CH3)2NCH2]- (g) 190.8 166.6 ± 3.3 kJ/mol 58.1029 ± 125231-49-4*0 Ethylamine CH3CH2NH2 (cr,l) -76.83 ± 0.67 kJ/mol 45.0837 ± 75-04-7*500 Hydrogen bromide HBr (aq, 10000 H2O) -120.36 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*850 Hydrogen iodide HI (aq, 8 H2O) -52.22 ± 0.12 kJ/mol 127.912410 ± 10034-85-2*813 Diazomethylium [HCNN]+ (g) 1395.7 1394.1 ± 1.3 kJ/mol 41.03157 ± 271249-81-1*0 Ammonium hydroxide NH4OH (aq, 700 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*835 1,3-Propanediyl CH2CH2CH2 (g, singlet TS) 337.7 323.0 ± 2.2 kJ/mol 42.0797 ± 32458-33-6*2 1-Aminoethyl anion [CH3CHNH2]- (g) 174.5 157.0 ± 3.2 kJ/mol 44.0763 ± 59263-55-7*0 Ammonium hydroxide NH4OH (aq, 750 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*836 Formic acid HC(O)OH (aq, 2 H2O) -425.50 ± 0.60 kJ/mol 46.0254 ± 64-18-6*803 Ethylaminylium [CH3CH2NH]+ (g, triplet) 1092.4 1077.3 ± 2.4 kJ/mol 44.0752 ± 54387-08-5*1 Ethylaminylium [CH3CH2NH]+ (g, anti-triplet) 1094.9 1079.1 ± 2.9 kJ/mol 44.0752 ± 54387-08-5*12 Hydrogen iodide HI (aq, 900 H2O) -56.448 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*838 Cyanic acid cation [HOCN]+ (g) 1135.7 1133.2 ± 2.9 kJ/mol 43.02423 ± 59780-31-3*0 Hydrogen bromide HBr (aq, 20000 H2O) -120.40 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*852 Cyanogen NCCN (cr,l) 273.93 289.18 ± 0.41 kJ/mol 52.0349 ± 460-19-5*500 N-Methylethanamine CH3CH2NHCH3 (cr,l) -74.9 ± 2.3 kJ/mol 59.1103 ± 624-78-2*500 Nitrogen sesquioxide cation [ONN(O)O]+ (g, vdW) 1027.6 1023.7 ± 4.8 kJ/mol 76.01113 ± *10544-73-7*0 Hydrogen fluoride HF (aq, 100000 H2O) -330.12 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*861 Formic acid HC(O)OH (aq, 2.5 H2O) -425.47 ± 0.60 kJ/mol 46.0254 ± 64-18-6*804 2-Methyl-2-propanamine (CH3)3CNH2 (l) -150.61 ± 0.53 kJ/mol 73.1369 ± 75-64-9*590 Vinylcyclopentadienylium [CH2CHC(CHCHCHCH)]+ (g) 1076.9 1059.5 ± 3.7 kJ/mol 91.1299 ± 146893-89-2*0 Formic acid HC(O)OH (aq, 3 H2O) -425.43 ± 0.60 kJ/mol 46.0254 ± 64-18-6*805 1-Hydroxyethylidene CH3COH (g, singlet) 57.44 47.13 ± 0.77 kJ/mol 44.0526 ± 30967-49-8*2 Naphtalene cation [C6H4(C4H4)]+ (g) 956.92 933.85 ± 0.55 kJ/mol 128.1700 ± 34512-27-1*0 Naphtalene anion [C6H4(C4H4)]- (g) 187.6 164.7 ± 3.0 kJ/mol 128.1711 ± 34509-91-6*0 COC vdW (CO)(C) (g) 589.7 598.4 ± 1.5 kJ/mol 40.0208 ± *12071-24-8*0 Nitric acid HON(O)O (aq, 100 H2O) -206.05 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*828 Hypoiodous acid HOI (aq) -116.3 ± 5.4 kJ/mol 143.91181 ± 14332-21-9*800 Nitric acid HON(O)O (aq, 500 H2O) -206.17 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*833 Acetic acid CH3C(O)OH (aq, 10000 H2O) -484.84 ± 0.33 kJ/mol 60.0520 ± 64-19-7*850 Ammonium hydroxide NH4OH (aq, 800 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*837 Ammonium hydroxide NH4OH (aq, 900 H2O) -366.38 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*838 Isocyanogen anion [CNCN]- (g) 386.6 388.7 ± 3.3 kJ/mol 52.0354 ± *83951-85-3*0 Formic acid HC(O)OH (aq, 4 H2O) -425.36 ± 0.60 kJ/mol 46.0254 ± 64-18-6*807 Formic acid HC(O)OH (aq, 5 H2O) -425.30 ± 0.60 kJ/mol 46.0254 ± 64-18-6*809 Formic acid HC(O)OH (aq, 6 H2O) -425.26 ± 0.60 kJ/mol 46.0254 ± 64-18-6*811 Formic acid HC(O)OH (aq, 7 H2O) -425.23 ± 0.60 kJ/mol 46.0254 ± 64-18-6*812 Formic acid HC(O)OH (aq, 8 H2O) -425.21 ± 0.60 kJ/mol 46.0254 ± 64-18-6*813 Ammonium hydroxide NH4OH (aq, 1500 H2O) -366.37 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*840 Hydrazoic acid anion [HNNN]- (g) 309.1 303.2 ± 2.3 kJ/mol 43.02871 ± 203264-98-6*0 Cyclopropylidene C(CH2CH2) (g) 475.03 467.01 ± 0.84 kJ/mol 40.0639 ± 2143-70-6*0 1,2-Difluoroethene CHFCHF (g) -302.98 -309.08 ± 0.83 kJ/mol 64.0341 ± 1691-13-0*0 Cyanic acid anion [HOCN]- (g) -9.2 -9.6 ± 3.1 kJ/mol 43.02533 ± 58199-47-6*0 Formic acid HC(O)OH (aq, 9 H2O) -425.20 ± 0.60 kJ/mol 46.0254 ± 64-18-6*814 Formic acid HC(O)OH (aq, 10 H2O) -425.20 ± 0.60 kJ/mol 46.0254 ± 64-18-6*815 Acetic acid CH3C(O)OH (aq, 20000 H2O) -484.85 ± 0.33 kJ/mol 60.0520 ± 64-19-7*852 Benzophenone C6H5C(O)C6H5 (l) -24.8 ± 1.5 kJ/mol 182.2179 ± 119-61-9*590 Diazene anion [HNNH]- (g, trans-cis-iso equilib) 265.6 258.8 ± 2.0 kJ/mol 30.02991 ± 100429-75-2*0 Acetic acid CH3C(O)OH (aq, 50000 H2O) -484.86 ± 0.33 kJ/mol 60.0520 ± 64-19-7*855 Butadiynylium [CCCCH]+ (g) 1781.3 1787.8 ± 3.2 kJ/mol 49.0502 ± 76108-67-3*0 Formic acid HC(O)OH (aq, 12 H2O) -425.19 ± 0.60 kJ/mol 46.0254 ± 64-18-6*816 Water H2O (cr, eq.press.) -286.278 -292.719 ± 0.022 kJ/mol 18.01528 ± 7732-18-5*509 Formic acid HC(O)OH (aq, 15 H2O) -425.19 ± 0.60 kJ/mol 46.0254 ± 64-18-6*817 Formic acid HC(O)OH (aq, 20 H2O) -425.19 ± 0.60 kJ/mol 46.0254 ± 64-18-6*818 Nitric acid HON(O)O (aq, 555.1 H2O) -206.17 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*895 Difluorovinylidene anion [CCF2]- (g) -88.3 -87.1 ± 2.3 kJ/mol 62.0188 ± 107693-92-5*0 Helium He (g, singlet) -0.000 -0.000 ± 0.000 kJ/mol 4.0026020 ± 7440-59-7*2 Formic acid HC(O)OH (aq, 25 H2O) -425.20 ± 0.60 kJ/mol 46.0254 ± 64-18-6*819 Tetrafluorohydrazine anion [NF2NF2]- (g, gauche) -184.5 -190.0 ± 3.3 kJ/mol 104.00764 ± 39775-43-4*2 Helium dication [He]+2 (g) 7622.839 7622.839 ± 0.000 kJ/mol 4.0015048 ± 12587-46-1*0 Vinyl hydroperoxide CH2CHOOH (g, gauche I) -20.7 -32.6 ± 2.0 kJ/mol 60.0520 ± 66998-78-5*2 Dibromovinylidene CCBr2 (g) 510.6 499.5 ± 4.1 kJ/mol 183.8294 ± 261771-36-2*0 Diisocyanogen anion [CNNC]- (g) 456.8 462.5 ± 3.6 kJ/mol 52.0354 ± *78800-22-3*0 Fluorovinylidene CCHF (g) 298.9 300.1 ± 3.1 kJ/mol 44.0277 ± 70302-00-0*0 Acetic acid CH3C(O)OH (aq, 100000 H2O) -484.87 ± 0.33 kJ/mol 60.0520 ± 64-19-7*861 Dihelium He2 (g, singlet) 1761.349 1757.613 ± 0.018 kJ/mol 8.0052040 ± 12184-98-4*2 Hydrogen fluoride HF (aq, 300 H2O) -322.17 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*831 Hydrohelate [HeH]- (g) 143.256 139.027 ± 0.0021 kJ/mol 5.011091 ± 12325-01-8*0 Methanediimine cation [HNCNH]+ (g) 1137.8 1135.7 ± 2.2 kJ/mol 42.03951 ± 1189338-16-6*0 Diisocyanogen cation [CNNC]+ (g) 1825.3 1828.5 ± 3.2 kJ/mol 52.0343 ± *78800-21-2*0 Methanediimine cation [HNCNH]+ (g, trans) 1139.0 1136.2 ± 3.2 kJ/mol 42.03951 ± 1189338-16-6*1 Bromovinylidene CCHBr (g) 466.4 460.4 ± 3.8 kJ/mol 104.9333 ± 161957-27-3*0 1-Hydroxyethylidene CH3COH (g) 57.44 47.13 ± 0.77 kJ/mol 44.0526 ± 30967-49-8*0 Diazene anion [HNNH]- (g, trans-cis equilib) 265.6 258.8 ± 2.0 kJ/mol 30.02991 ± 100429-75-2*1 Difluorophosgene anion [CF2O]- (g) -602.3 -604.2 ± 3.3 kJ/mol 66.00745 ± 474815-26-4*0 1,1-Ethenediol CH2C(OH)2 (g) -307.54 -320.08 ± 0.83 kJ/mol 60.0520 ± 10375-04-9*0 2-Cyclopropyn-1-ylidene C(CC) (g) 898.4 905.3 ± 1.5 kJ/mol 36.0321 ± 102508-15-6*0 Hydrogen peroxide cation [HOOH]+ (g, cis, ortho) 931.08 924.20 ± 0.98 kJ/mol 34.01413 ± 12325-10-9*21 Fluoro(fluorooxy)methylene FCOF (g) -134.8 -136.0 ± 1.3 kJ/mol 66.00691 ± 479587-30-9*0 Hydrogen bromide HBr (aq, 111 H2O) -119.56 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*892 1,1-Ethenediol CH2C(OH)2 (g, syn-syn C2v) -302.3 -315.7 ± 1.9 kJ/mol 60.0520 ± 10375-04-9*2 Neon decacation [Ne]+10 (g) 338828.3 338828.3 ± 1.4 kJ/mol 20.17421 ± 32218-07-8*0 Neon hydride NeH (g) 215.989 211.755 ± 0.024 kJ/mol 21.18764 ± 17438-52-7*0 1,1-Ethenediol CH2C(OH)2 (g, gauche-gauche C2) -296.0 -309.2 ± 1.9 kJ/mol 60.0520 ± 10375-04-9*3 Hydroneonate [NeH]- (g) 143.096 142.084 ± 0.035 kJ/mol 21.18819 ± 75514-98-6*0 Isocyanogen chloride cation [ClNC]+ (g) 1481.0 1482.2 ± 3.9 kJ/mol 61.4696 ± 956475-91-5*0 Glycolaldehyde HC(O)CH2OH (g) -304.31 -317.35 ± 0.89 kJ/mol 60.0520 ± 141-46-8*0 Formic acid HC(O)OH (aq, 30 H2O) -425.21 ± 0.60 kJ/mol 46.0254 ± 64-18-6*820 1-Hydroxyethenylium [CH2COH]+ (g) 841.7 834.9 ± 1.4 kJ/mol 43.0441 ± 41084-89-3*0 Krypton dication [Kr]+2 (g) 3701.124 3701.124 ± 0.013 kJ/mol 83.7989 ± 18469-91-5*0 Propene CH3CHCH2 (cr,l) 7.72 4.02 ± 0.82 kJ/mol 42.0797 ± 115-07-1*500 Xenon dication [Xe]+2 (g) 3194.14 3194.14 ± 0.36 kJ/mol 131.2889 ± 14066-95-6*0 Formic acid HC(O)OH (aq, 40 H2O) -425.23 ± 0.60 kJ/mol 46.0254 ± 64-18-6*821 Diazoethenylidene cation [NNCC]+ (g) 1771.1 1773.1 ± 3.5 kJ/mol 52.0343 ± *130760-10-0*0 Hydrogen chloride HCl (aq, 100000 H2O) -166.948 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*861 Phosgene cation [CCl2O]+ (g) 897.0 896.0 ± 1.7 kJ/mol 98.9150 ± 73249-38-4*0 Phosgene CCl2O (cr, l, I+liquid) -242.78 ± 0.25 kJ/mol 98.9155 ± 75-44-5*501 Phosgene CCl2O (cr, l, II+liquid) -255.48 -242.78 ± 0.25 kJ/mol 98.9155 ± 75-44-5*502 Hydrogen chloride HCl (aq, 400 H2O) -166.337 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*832 Chloro(chlorooxy)methylene ClCOCl (g) 73.5 73.9 ± 3.6 kJ/mol 98.9155 ± 479587-31-0*0 Sulfur atom hexacation [S]+6 (g) 26947.2 26949.0 ± 3.4 kJ/mol 32.0627 ± 22537-26-4*0 Formic acid HC(O)OH (aq, 50 H2O) -425.25 ± 0.60 kJ/mol 46.0254 ± 64-18-6*822 Sulfur atom dianion [S]-2 (g) 454.0 455.8 ± 3.2 kJ/mol 32.0671 ± 18496-25-8*0 Chloro(chlorooxy)methylene ClCOCl (g, trans) 98. 105. ± 15. kJ/mol 98.9155 ± 479587-31-0*1 Diazoethenylidene anion [NNCC]- (g) 529.6 532.2 ± 3.5 kJ/mol 52.0354 ± *130760-11-1*0 Disulfur anion [S2]- (g) -34.06 -33.12 ± 0.52 kJ/mol 64.1325 ± 12185-15-8*0 Hydrogen chloride HCl (aq, 111 H2O) -165.820 ± 0.024 kJ/mol 36.46064 ± 7647-01-0*892 3H-diazirin-3-ylidene-methylene CC(NN) (g) 837.3 839.9 ± 2.3 kJ/mol 52.0349 ± 204253-88-3*0 Sulfonyl cation [OSO]+ (g) 897.01 894.74 ± 0.13 kJ/mol 64.0643 ± 12439-77-9*0 Sulfur dioxide OSO (cr,l) -331.5 -320.1 ± 1.9 kJ/mol 64.0648 ± 7446-09-5*500 Formic acid HC(O)OH (aq, 55.51 H2O) -425.26 ± 0.60 kJ/mol 46.0254 ± 64-18-6*891 Iminomethyl HCNH (g) 275.79 272.19 ± 0.56 kJ/mol 28.03332 ± 15691-95-9*0 Nitric acid HON(O)O (aq, 2000 H2O) -206.30 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*841 Oxonium [H3O]+ (aq) -285.804 ± 0.022 kJ/mol 19.02267 ± 13968-08-6*800 Oxosulfate [SO]- (g) -102.66 -101.89 ± 0.50 kJ/mol 48.0659 ± 12269-52-2*0 Trioxidane HOOOH (g) -81.76 -90.36 ± 0.40 kJ/mol 50.01408 ± 14699-99-1*0 Sulfur trioxide cation [OS(O)O]+ (g) 847.65 844.74 ± 0.68 kJ/mol 80.0637 ± 12710-95-1*0 Ammonium hydroxide NH4OH (aq, 2000 H2O) -366.36 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*841 Sulfite [OS(O)O]-2 (g) -273.7 -279.3 ± 4.2 kJ/mol 80.0653 ± 14265-45-3*0 Isocyanic fluoride cation [FNC]+ (g) 1618.0 1618.6 ± 4.0 kJ/mol 45.01529 ± *16992-26-0*0 Hydrogen iodide HI (aq, 25 H2O) -55.35 ± 0.11 kJ/mol 127.912410 ± 10034-85-2*819 Sulfur oxide peroxide OSOO (g) -26.0 -30.2 ± 2.3 kJ/mol 80.0642 ± 175799-68-5*0 Formic acid HC(O)OH (aq, 75 H2O) -425.28 ± 0.60 kJ/mol 46.0254 ± 64-18-6*825 Sulfur oxide peroxide OSOO (g, trans) -3.4 -7.1 ± 3.0 kJ/mol 80.0642 ± 175799-68-5*1 Vinyl hydroperoxide CH2CHOOH (g, gauche II) -20.6 -32.4 ± 2.0 kJ/mol 60.0520 ± 66998-78-5*3 Chlorohydroxymethylene ClCOH (g, cis) 14.4 11.5 ± 3.2 kJ/mol 64.4707 ± 147723-60-2*2 Sulfuryl dichloride cation [OS(O)Cl2]+ (g) 814.1 809.8 ± 3.2 kJ/mol 134.9697 ± *7791-25-5*0 Dichlorodioxosulfate [OS(O)Cl2]- (g) -604.8 -607.4 ± 3.5 kJ/mol 134.9707 ± 12599-04-1*0 Chlorohydroxymethylene ClCOH (g) 14.0 11.3 ± 2.5 kJ/mol 64.4707 ± 147723-60-2*0 Disulfur oxide cation [SSO]+ (g) 970.53 969.25 ± 0.60 kJ/mol 80.1309 ± 135758-60-0*0 Oxothioxosulfate [SSO]- (g) -231.95 -233.56 ± 0.87 kJ/mol 80.1319 ± 12143-07-6*0 C=O-C cation [COC]+ (g) 1585.8 1592.9 ± 2.7 kJ/mol 40.0203 ± 83483-98-1*0 (Chlorooxy)methylene HCOCl (g, trans) 155.5 155.3 ± 3.7 kJ/mol 64.4707 ± 331419-80-8*1 Carbonate [OC(O)O]-2 (aq) -675.166 ± 0.053 kJ/mol 60.0100 ± 3812-32-6*800 (Chlorooxy)methylene HCOCl (g) 119.2 117.9 ± 2.7 kJ/mol 64.4707 ± 331419-80-8*0 Formic acid HC(O)OH (aq, 111 H2O) -425.30 ± 0.60 kJ/mol 46.0254 ± 64-18-6*892 Hydrogen bromide HBr (aq, 5 H2O) -110.69 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*809 Ammonium hydroxide NH4OH (aq, 1.5 H2O) -364.34 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*802 Tetroxidane HOOOOH (g, C2 I) -31.30 -41.81 ± 0.64 kJ/mol 66.0135 ± 29683-94-1*22 Sulfoniumyl [H2S]+ (g) 992.66 989.75 ± 0.18 kJ/mol 34.0813 ± 26453-60-1*0 Dihydrogen sulfide ion [H2S]- (g) 108.2 106.9 ± 3.2 kJ/mol 34.0824 ± 12311-21-6*0 Nitric acid HON(O)O (aq, 5000 H2O) -206.38 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*844 Hydrogen chloride HCl (aq, 7000 H2O) -166.823 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*846 Formic acid HC(O)OH (aq, 200 H2O) -425.33 ± 0.60 kJ/mol 46.0254 ± 64-18-6*830 Chloroformyl anion [ClCO]- (g) -356.5 -352.9 ± 3.3 kJ/mol 63.4633 ± 41976-93-6*0 Methoxymethylene CH3OCH (g, singlet) 129.24 118.73 ± 0.78 kJ/mol 44.0526 ± 19527-10-7*2 Isocyanic fluoride anion [FNC]- (g) 73.9 75.6 ± 5.7 kJ/mol 45.01639 ± 357426-78-9*0 Hydrogen bromide HBr (aq, 50000 H2O) -120.44 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*855 Sulfuric acid cation [OS(O)(OH)2]+ (g) 400.8 387.8 ± 3.2 kJ/mol 98.0789 ± 247933-66-0*0 Formic acid HC(O)OH (aq, 300 H2O) -425.34 ± 0.60 kJ/mol 46.0254 ± 64-18-6*831 Hydrogen bromide HBr (aq, 2640 H2O) -120.24 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*957 Formic acid HC(O)OH (aq, 400 H2O) -425.34 ± 0.60 kJ/mol 46.0254 ± 64-18-6*832 1-Hydroxyethenylium [CH2COH]+ (g, syn-triplet) 1045.7 1038.7 ± 3.4 kJ/mol 43.0441 ± 41084-89-3*12 Sulfate [OS(O)(O)O]-2 (aq) -909.16 ± 0.13 kJ/mol 96.0647 ± 14808-79-8*800 Oxirane O(CH2CH2) (cr,l) -77.13 -77.80 ± 0.60 kJ/mol 44.0526 ± 75-21-8*500 Trioxidaniumyl [HOOOH]+ (g) 925.5 916.6 ± 1.4 kJ/mol 50.01353 ± 161321-37-5*0 Sulfuric acid OS(O)(OH)2 (aq, 10 H2O) -880.42 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*815 Sulfuric acid OS(O)(OH)2 (aq, 12 H2O) -882.02 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*816 Sulfuric acid OS(O)(OH)2 (aq, 15 H2O) -883.51 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*817 Sulfuric acid OS(O)(OH)2 (aq, 20 H2O) -884.81 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*818 Sulfuric acid OS(O)(OH)2 (aq, 25 H2O) -885.48 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*819 Formic acid HC(O)OH (aq, 500 H2O) -425.35 ± 0.60 kJ/mol 46.0254 ± 64-18-6*833 Chlorine chlorite ClOClO (g) 168.6 166.4 ± 1.3 kJ/mol 102.9042 ± 105206-44-8*0 Formic acid HC(O)OH (aq, 555.1 H2O) -425.35 ± 0.60 kJ/mol 46.0254 ± 64-18-6*895 Hydrogen chloride HCl (aq, 15 H2O) -162.856 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*817 Sulfuric acid OS(O)(OH)2 (aq, 150 H2O) -888.08 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*829 Sulfuric acid OS(O)(OH)2 (aq, 200 H2O) -888.52 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*830 Sulfuric acid OS(O)(OH)2 (aq, 300 H2O) -889.26 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*831 Sulfuric acid OS(O)(OH)2 (aq, 400 H2O) -889.86 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*832 Sulfuric acid OS(O)(OH)2 (aq, 500 H2O) -890.38 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*833 Sulfuric acid OS(O)(OH)2 (aq, 600 H2O) -890.87 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*834 Hydrogen iodide HI (aq, 30 H2O) -55.51 ± 0.11 kJ/mol 127.912410 ± 10034-85-2*820 Hydrogen bromide HBr (aq, 1 H2O) -71.67 ± 0.13 kJ/mol 80.9119 ± 10035-10-6*801 Sulfuric acid OS(O)(OH)2 (aq, 900 H2O) -891.94 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*838 2-Propenylidene CHCHCH2 (g, triplet syn) 419.1 411.6 ± 2.3 kJ/mol 40.0639 ± 19527-08-3*12 Isocyanogen chloride anion [ClNC]- (g) 102.9 107.4 ± 3.9 kJ/mol 61.4707 ± 923019-39-0*0 1-Hydroxyethenyl anion [CH2COH]- (g) 15.1 8.6 ± 2.1 kJ/mol 43.0452 ± 112539-13-6*0 Sulfuric acid OS(O)(OH)2 (aq, 4000 H2O) -897.00 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*843 2-Iodoethanol ICH2CH2OH (g) -131.9 -150.2 ± 2.5 kJ/mol 171.9650 ± 624-76-0*0 Propane CH3CH2CH3 (cr,l) -110.20 -121.18 ± 0.66 kJ/mol 44.0956 ± 74-98-6*500 Formic acid HC(O)OH (aq, 600 H2O) -425.35 ± 0.60 kJ/mol 46.0254 ± 64-18-6*834 Sulfuric acid OS(O)(OH)2 (aq, 20000 H2O) -903.22 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*852 Sulfuric acid OS(O)(OH)2 (aq, 50000 H2O) -905.91 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*855 Sulfuric acid OS(O)(OH)2 (aq, 100000 H2O) -907.21 ± 0.13 kJ/mol 98.0795 ± 7664-93-9*861 Formic acid HC(O)OH (aq, 700 H2O) -425.35 ± 0.60 kJ/mol 46.0254 ± 64-18-6*835 Hydrogen fluoride HF (aq, 500 H2O) -322.35 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*833 1-Hydroxyethenyl anion [CH2COH]- (g, anti) 16.5 9.8 ± 2.7 kJ/mol 43.0452 ± 112539-13-6*21 1,3,5-Hexatriyne cation [HCCCCCCH]+ (g) 1600.8 1605.5 ± 2.8 kJ/mol 74.0795 ± 61866-06-6*0 Hydrogen fluoride HF (aq, 18.5 H2O) -321.82 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*887 Chlorine pentafluoride cation [FCl(F)(F)(F)F]+ (g) 1005.9 996.9 ± 3.2 kJ/mol 130.44417 ± 478167-78-1*0 Nitrosyl nitrate ONONO2 (g) 48.3 40.4 ± 1.8 kJ/mol 92.0111 ± 15969-55-8*0 3-Diaziridinylidene C(NHNH) (g) 521.8 515.0 ± 1.5 kJ/mol 42.04006 ± 85513-79-7*0 Hydrogen iodide HI (aq, 40 H2O) -55.695 ± 0.095 kJ/mol 127.912410 ± 10034-85-2*821 1,3,5-Hexatriynylium [CCCCCCH]+ (g, triplet) 1913.7 1922.8 ± 8.2 kJ/mol 73.0716 ± 81932-75-4*1 Peroxyhypochlorous acid cation [HOOCl]+ (g) 1030.4 1024.6 ± 2.5 kJ/mol 68.4589 ± *67952-07-2*0 3-Diaziridinylidene C(NHNH) (g, syn) 537.0 530.3 ± 2.0 kJ/mol 42.04006 ± 85513-79-7*2 3-Diaziridinylidene cation [C(NHNH)]+ (g) 1479.7 1473.7 ± 2.4 kJ/mol 42.03951 ± *85513-79-7*0 3-Diaziridinylidene cation [C(NHNH)]+ (g, syn) 1497.2 1491.7 ± 3.1 kJ/mol 42.03951 ± *85513-79-7*2 Formaldehyde CH2O (g, ortho singlet) -105.256 -109.222 ± 0.094 kJ/mol 30.02598 ± 50-00-0*22 Hydrogen fluoride HF (aq, 600 H2O) -322.43 ± 0.10 kJ/mol 20.006343 ± 7664-39-3*834 Hydrogen iodide HI (aq, 3 H2O) -36.91 ± 0.56 kJ/mol 127.912410 ± 10034-85-2*805 1,2-Propadien-1-yl-3-ylidene anion [CCC]- (g, lin) 621.7 629.1 ± 1.3 kJ/mol 36.0326 ± 109292-47-9*1 Methylaminyliumyl [CH3N]+ (g ?) 1388.2 1381.9 ± 2.2 kJ/mol 29.04071 ± 56924-51-7*0 Hydrogen fluoride HF (aq, 500000 H2O) -333.04 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*866 Propylidene CH3CH2CH (g, triplet anti) 349.7 336.0 ± 2.0 kJ/mol 42.0797 ± 6700-78-3*12 Ammonium hydroxide NH4OH (aq, 20000 H2O) -366.19 ± 0.41 kJ/mol 35.04584 ± 1336-21-6*852 Hydrogen iodide HI (aq, 50 H2O) -55.804 ± 0.095 kJ/mol 127.912410 ± 10034-85-2*822 Trioxodinitrate anion [ONN(O)O]- (g) -104.2 -107.5 ± 1.9 kJ/mol 76.01223 ± 194856-62-7*0 Methoxymethylene CH3OCH (g) 129.24 118.73 ± 0.78 kJ/mol 44.0526 ± 19527-10-7*0 Oxirene O(CHCH) (g) 272.43 270.27 ± 0.60 kJ/mol 42.0367 ± 157-18-6*0 Sulfur hydroxide oxide OHS(O)(O)O (g) -474.5 -483.5 ± 1.6 kJ/mol 97.0715 ± 12337-07-4*0 Sulfur hydroxide oxide OHS(O)(O)O (g, eclipsed) -473.7 -483.0 ± 2.5 kJ/mol 97.0715 ± 12337-07-4*2 Sulfur hydroxide oxide cation [OHS(O)(O)O]+ (g) 658.6 648.3 ± 3.4 kJ/mol 97.0710 ± *12337-07-4*0 Sulfur hydroxide oxide cation [OHS(O)(O)O]+ (g, staggered) 663.1 652.2 ± 3.9 kJ/mol 97.0710 ± *12337-07-4*1 Diiodine cation [I2]+ (g) 963.523 960.408 ± 0.018 kJ/mol 253.808391 ± 28712-14-3*0 Hydrogen iodide HI (aq, 1000 H2O) -56.465 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*839 Sulfurous acid S(O)(OH)2 (g, trans) -507.1 -517.7 ± 1.3 kJ/mol 82.0801 ± 7782-99-2*1 Sulfurous acid S(O)(OH)2 (g, gauche) -497.5 -507.5 ± 1.4 kJ/mol 82.0801 ± 7782-99-2*3 Acetic acid CH3C(O)OH (aq, undissoc) -484.79 ± 0.27 kJ/mol 60.0520 ± 64-19-7*1000 Hydrogen fluoride HF (aq, 50000 H2O) -328.57 ± 0.16 kJ/mol 20.006343 ± 7664-39-3*855 Hydrogen bromide HBr (aq, 10 H2O) -115.90 ± 0.12 kJ/mol 80.9119 ± 10035-10-6*815 Sulfite [OS(O)O]-2 (aq) -635.25 ± 0.15 kJ/mol 80.0653 ± 14265-45-3*800 Sulfurous acid S(O)(OH)2 (aq, 100 H2O) -610.09 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*828 Sulfurous acid S(O)(OH)2 (aq, 150 H2O) -610.81 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*829 Sulfurous acid S(O)(OH)2 (aq, 200 H2O) -611.35 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*830 Sulfurous acid S(O)(OH)2 (aq, 250 H2O) -611.78 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*908 Sulfurous acid S(O)(OH)2 (aq, 300 H2O) -612.16 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*831 Sulfurous acid S(O)(OH)2 (aq, 400 H2O) -612.76 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*832 Sulfurous acid S(O)(OH)2 (aq, 500 H2O) -613.26 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*833 Sulfurous acid S(O)(OH)2 (aq, 750 H2O) -614.20 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*836 Sulfurous acid S(O)(OH)2 (aq, 1000 H2O) -614.89 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*839 Sulfurous acid S(O)(OH)2 (aq, 1500 H2O) -615.98 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*840 Sulfurous acid S(O)(OH)2 (aq, 2000 H2O) -616.74 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*841 Sulfurous acid S(O)(OH)2 (aq, 3000 H2O) -617.78 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*842 Sulfurous acid S(O)(OH)2 (aq, 3500 H2O) -618.19 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*899 Sulfurous acid S(O)(OH)2 (aq, 4000 H2O) -618.52 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*843 Sulfurous acid S(O)(OH)2 (aq, 5000 H2O) -619.11 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*844 Sulfurous acid S(O)(OH)2 (aq, 7500 H2O) -620.09 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*847 Sulfurous acid S(O)(OH)2 (aq, 10000 H2O) -620.68 ± 0.14 kJ/mol 82.0801 ± 7782-99-2*850 Sulfonic acid SH(O)(O)OH (g) -482.2 -494.8 ± 1.4 kJ/mol 82.0801 ± *7782-99-2*0 Hydrogen iodide HI (aq, 1250 H2O) -56.494 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*954 Diatomic bromine cation [Br2]+ (g) 1060.34 1045.39 ± 0.23 kJ/mol 159.8075 ± 12595-71-0*0 Isofulminic acid cation [HONC]+ (g) 1376.9 1374.9 ± 2.9 kJ/mol 43.02423 ± 117800-60-9*0 Hydrogen fluoride HF (aq, 25 H2O) -321.87 ± 0.11 kJ/mol 20.006343 ± 7664-39-3*819 3,3-Dioxidedioxathiirane OS(OO)O (g) -257.1 -265.2 ± 1.4 kJ/mol 96.0636 ± 1177730-84-5*0 Nitric acid HON(O)O (aq, 10000 H2O) -206.42 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*850 Cyanogen chloride cation [ClCN]+ (g) 1326.21 1327.54 ± 0.95 kJ/mol 61.4696 ± 37612-72-9*0 Sulfur tetraoxide OS(O)(O)O (g) -228.2 -235.1 ± 2.0 kJ/mol 96.0636 ± 12772-98-4*0 Oxirene O(CHCH) (g, triplet) 387.8 384.4 ± 1.3 kJ/mol 42.0367 ± 157-18-6*1 Sulfur tetraoxide OS(O)(O)O (g, triplet) -228.2 -235.1 ± 2.0 kJ/mol 96.0636 ± 12772-98-4*1 Sulfur tetraoxide OS(O)(O)O (g, singlet) -163.6 -169.4 ± 2.9 kJ/mol 96.0636 ± 12772-98-4*2 Formic acid HC(O)OH (aq, 800 H2O) -425.35 ± 0.60 kJ/mol 46.0254 ± 64-18-6*837 Vinylcyclopentadienylium [CH2CHC(CHCHCHCH)]+ (g, triplet) 1099.4 1081.5 ± 4.5 kJ/mol 91.1299 ± 146893-89-2*1 Sulfur tetraoxide OS(O)(O)O (g, singlet C3v ?) -155.4 -164.3 ± 4.0 kJ/mol 96.0636 ± 12772-98-4*23 Trihydrogen HHH (g, TS) 254.5 250.7 ± 1.2 kJ/mol 3.02382 ± 12184-91-7*200 [1.1.1]Propellane (CH2)3(CC) (g) 378.6 361.0 ± 1.5 kJ/mol 66.1011 ± 35634-10-7*0 5-Ethenyl-1,3-cyclopentadiene CH2CHCH(CHCHCHCH) (g) 237.1 216.3 ± 1.4 kJ/mol 92.1384 ± 29647-85-6*0 Formic acid HC(O)OH (aq, 900 H2O) -425.36 ± 0.60 kJ/mol 46.0254 ± 64-18-6*838 Ethynol cation [HCCOH]+ (g) 1063.8 1061.2 ± 2.9 kJ/mol 42.0361 ± 84005-02-7*0 Nitric acid HON(O)O (aq, 50000 H2O) -206.49 ± 0.18 kJ/mol 63.01288 ± 7697-37-2*855 Propynylidene HCCCH (g, singlet) 597.8 599.6 ± 1.2 kJ/mol 38.0480 ± 67152-18-5*2 Dioxoperoxysulfate dianion [OS(O)OO]-2 (g) -209.1 -214.8 ± 2.1 kJ/mol 96.0647 ± *14808-79-8*0 Dioxoperoxysulfate dianion [OS(O)OO]-2 (g, Cs) -186.5 -192.2 ± 2.9 kJ/mol 96.0647 ± *14808-79-8*2 Hydrogen chloride HCl (aq, 10000 H2O) -166.848 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*850 Methanethiol cation [CH3SH]+ (g) 901.89 891.85 ± 0.46 kJ/mol 48.1079 ± 53369-41-8*0 Formic acid HC(O)OH (aq, 1000 H2O) -425.36 ± 0.60 kJ/mol 46.0254 ± 64-18-6*839 Ethynol anion [HCCOH]- (g) 163.5 165.0 ± 3.3 kJ/mol 42.0372 ± 864971-50-6*0 O--HH Complex (H2)(O) (g, vdW C2v ?) 247.2 248.2 ± 2.0 kJ/mol 18.01528 ± *7732-18-5*102 Thioformaldehyde anion [CH2S]- (g) 75.8 72.8 ± 2.7 kJ/mol 46.0931 ± 71928-47-7*0 Thioformaldehyde CH2S (g) 121.3 117.6 ± 2.0 kJ/mol 46.0926 ± 865-36-1*0 Thioformaldehyde CH2S (g, triplet) 294.9 292.3 ± 2.0 kJ/mol 46.0926 ± 865-36-1*3 Hydrogen iodide HI (aq, 2000 H2O) -56.553 ± 0.090 kJ/mol 127.912410 ± 10034-85-2*841 Ethanethiol cation [CH3CH2SH]+ (g) 867.11 850.94 ± 0.59 kJ/mol 62.1345 ± 69762-64-7*0 5-Ethenyl-1,3-cyclopentadiene CH2CHCH(CHCHCHCH) (g, gauche) 242.1 220.2 ± 2.2 kJ/mol 92.1384 ± 29647-85-6*2 Trichlorine cation [Cl3]+ (g) 1056.6 1055.5 ± 1.4 kJ/mol 106.3576 ± 33088-85-6*0 Dimethyl sulfide cation [CH3SCH3]+ (g) 817.85 802.10 ± 0.48 kJ/mol 62.1345 ± 34480-65-4*0 Propylidyne CH3CH2C (g) 492.7 483.0 ± 1.2 kJ/mol 41.0718 ± 85056-54-8*0 Dimethyl carbonate C(O)(OCH3)2 (g, cis-trans) -537.1 -557.8 ± 1.8 kJ/mol 90.0779 ± 616-38-6*2 Diiodine I2 (aq, undissoc) 23.243 ± 0.082 kJ/mol 253.808940 ± 7553-56-2*1000 Nitrosodioxaziridine ONN(OO) (g, cis) 413.9 408.1 ± 3.2 kJ/mol 76.01168 ± 132871-99-9*2 Nitrous acid anion [HONO]- (g) -105.84 -109.31 ± 0.78 kJ/mol 47.01403 ± 256393-36-9*0 Formic acid HC(O)OH (aq, 2000 H2O) -425.36 ± 0.60 kJ/mol 46.0254 ± 64-18-6*841 Nitrosodioxaziridine ONN(OO) (g, gauche) 415.3 409.5 ± 2.8 kJ/mol 76.01168 ± 132871-99-9*3 Carbon disulfide cation [SCS]+ (g) 1088.27 1090.02 ± 0.68 kJ/mol 76.1422 ± 12539-80-9*0 Sulfidocarbonothioyl [SCS]- (g) 73.5 75.0 ± 3.3 kJ/mol 76.1432 ± 12122-00-8*0 Formic acid HC(O)OH (aq, 5000 H2O) -425.37 ± 0.60 kJ/mol 46.0254 ± 64-18-6*844 Tetrafluorohydrazine cation [NF2NF2]+ (g) 1129.2 1123.0 ± 2.5 kJ/mol 104.00654 ± 37366-75-9*0 Carbon monosulfide cation [CS]+ (g) 1371.32 1374.56 ± 0.78 kJ/mol 44.0762 ± 12351-95-0*0 Carbon monosulfide anion [CS]- (g) 259.1 262.9 ± 2.2 kJ/mol 44.0772 ± 12121-99-2*0 Hypoiodous acid cation [HOI]+ (g) 891.4 886.6 ± 3.3 kJ/mol 143.91126 ± 193098-20-3*0 Propargylenide [HCCCH]- (g) 434.5 437.7 ± 1.1 kJ/mol 38.0485 ± 82906-05-6*0 Platinum atom anion Pt- (g) 358.4 358.9 ± 1.7 kJ/mol 195.0785 ± 40817-31-0*0 Cyanoamidogen HNCN (g) 322.70 320.21 ± 0.63 kJ/mol 41.03212 ± 12347-01-2*0 Platinum dimer cation [Pt2]+ (g) 1661.0 1659.6 ± 4.3 kJ/mol 390.1555 ± 73146-08-4*0 Platinum dimer anion [Pt2]- (g) 640.3 639.8 ± 3.9 kJ/mol 390.1565 ± 153298-77-2*0 Cyanoamidogen HNCN (g, quartet) 652.4 650.3 ± 1.2 kJ/mol 41.03212 ± 12347-01-2*2 Cyanoaminylium [HNCN]+ (g) 1363.1 1360.8 ± 1.3 kJ/mol 41.03157 ± 205443-18-1*0 Formylimidogen HC(O)N (g, triplet) 245.2 242.1 ± 4.6 kJ/mol 43.02478 ± 42288-92-6*1 Hydrogen atom H (ad, Pt(111) fcc) -37.0 -40.2 ± 1.1 kJ/mol 1.007940 ± 12385-13-6*1001000 Formic acid HC(O)OH (aq, 10000 H2O) -425.38 ± 0.60 kJ/mol 46.0254 ± 64-18-6*850 Cyanogen chloride anion [ClCN]- (g) 46.8 51.2 ± 3.1 kJ/mol 61.4707 ± 12281-43-5*0 Cyanoamidogen anion [HNCN]- (g, triplet) 391.7 389.9 ± 1.8 kJ/mol 41.03267 ± 67131-47-9*1 Cyanoamidogen anion [HNCN]- (g, t-triplet) 392.3 390.4 ± 6.2 kJ/mol 41.03267 ± 67131-47-9*11 Hydrogen atom H (ad, Pt(111) atop) -32. -34. ± 20. kJ/mol 1.007940 ± 12385-13-6*1002000 1-Methoxyethenol CH2C(OH)OCH3 (g) -284.3 -302.7 ± 1.2 kJ/mol 74.0785 ± 4453-91-2*0 Formic acid HC(O)OH (aq, 20000 H2O) -425.38 ± 0.60 kJ/mol 46.0254 ± 64-18-6*852 Formic acid HC(O)OH (aq, 50000 H2O) -425.40 ± 0.60 kJ/mol 46.0254 ± 64-18-6*855 2-(Cyclopenta-2,4-dien-1-ylidene)ethan-1-ide [CH2CHC(CHCHCHCH)]- (g) 132.5 114.4 ± 3.4 kJ/mol 91.1310 ± 405519-46-2*0 Formic acid HC(O)OH (aq, 100000 H2O) -425.43 ± 0.60 kJ/mol 46.0254 ± 64-18-6*861 Hydrogen chloride HCl (aq, 55.51 H2O) -165.294 ± 0.023 kJ/mol 36.46064 ± 7647-01-0*891 Argon cation Ar+ (g) 1520.571 1520.580 ± 0.000 kJ/mol 39.94745 ± 14791-69-6*0 Argon dimer cation [Ar2]+ (g) 1393.760 1391.173 ± 0.018 kJ/mol 79.8955 ± 17596-58-6*0 Argon atom dication [Ar]+2 (g) 4186.429 4186.468 ± 0.013 kJ/mol 39.94690 ± 15056-24-3*0 Argon dimer Ar2 (g) -1.013 -6.347 ± 0.0051 kJ/mol 79.8960 ± 12595-59-4*0 Argon anion Ar- (g, 2S1/2) 25. 25. ± 28. kJ/mol 39.94855 ± 16544-90-4*1 Neon anion Ne- (g) 13. 13. ± 29. kJ/mol 20.18025 ± 20205-95-2*0 Argon anion Ar- (g) 25. 25. ± 28. kJ/mol 39.94855 ± 16544-90-4*0 Helium anion He- (g, 1s2.2s 2S1/2) 51. 51. ± 130. kJ/mol 4.0031506 ± 14452-58-5*1 Helium anion He- (g) 51. 51. ± 130. kJ/mol 4.0031506 ± 14452-58-5*0 Dihelium He2 (g, halo singlet) -0.000 -6.197 ± 0.000 kJ/mol 8.0052040 ± 12184-98-4*3 Dihelium He2 (g) -0.000 -6.197 ± 0.000 kJ/mol 8.0052040 ± 12184-98-4*0 Dichlorine Cl2 (cr,l) -30.21 -18.49 ± 0.51 kJ/mol 70.9054 ± 7782-50-5*500 Helium anion He- (g, 1s.2s2 2S1/2) 1868.42 1868.42 ± 0.19 kJ/mol 4.0031506 ± 14452-58-5*2 Helium He (aq, undissoc) -0.702 ± 0.092 kJ/mol 4.0026020 ± 7440-59-7*1000 Dinitrogen N2 (aq, undissoc) -10.30 ± 0.32 kJ/mol 28.01348 ± 7727-37-9*1000 Dihydrogen H2 (aq, undissoc) -4.104 ± 0.059 kJ/mol 2.01588 ± 1333-74-0*1000 Neon Ne (aq, undissoc) -3.883 ± 0.092 kJ/mol 20.17970 ± 7440-01-9*1000 Dioxygen O2 (aq, undissoc) -11.963 ± 0.041 kJ/mol 31.99880 ± 7782-44-7*1000 Argon anion Ar- (g, 4S3/2) 1111.116 1111.116 ± 0.098 kJ/mol 39.94855 ± 16544-90-4*2 Argon Ar (aq, undissoc) -12.249 ± 0.092 kJ/mol 39.94800 ± 7440-37-1*1000 Krypton anion Kr- (g) 110. 110. ± 350. kJ/mol 83.8005 ± 20205-93-0*0 Krypton Kr (aq, undissoc) -15.65 ± 0.11 kJ/mol 83.8000 ± 7439-90-9*1000 Xenon Xe (aq, undissoc) -19.404 ± 0.092 kJ/mol 131.2900 ± 7440-63-3*1000 Radon cation Rn+ (g) 1037.07 1037.07 ± 0.61 kJ/mol 221.9995 ± 22541-65-7*0 Radon Rn (aq, undissoc) -21.33 ± 0.96 kJ/mol 222.0000 ± 10043-92-2*1000 Hydron H+ (aq) 0 0 exact 1.007391 ± 12408-02-5*800
References
1
B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, J. Phys. Chem. A 108 , 9979-9997 (2004)
[DOI: 10.1021/jp047912y]
2
B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, st Century. J. Phys. Conf. Ser. 16 , 561-570 (2005)
[DOI: 10.1088/1742-6596/16/1/078]
3
B. Ruscic and D. H. Bross,
4
T. L. Nguyen et al, ongoing studies (2024)
5
B. Ruscic, Int. J. Quantum Chem. 114 , 1097-1101 (2014)
[DOI: 10.1002/qua.24605]
6
B. Ruscic and D. H. Bross, Computer Aided Chem. Eng. 45 , 3-114 (2019)
[DOI: 10.1016/B978-0-444-64087-1.00001-2]
Formula
The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
Uncertainties
The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5 ] and Ruscic and Bross[6 ]). 5 kJ/mol.
Website Functionality Credits
The reorganization of the website was developed and implemented by David H. Bross (ANL). Indigo-depict . Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/ .
Acknowledgement
This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.
Page generated: 04/18/2025
![[H][H]](images/1.png)
![[He]](images/2.png)
![[C]](images/3.png)
![[Ne]](images/7.png)
![[Si]](images/8.png)
![[S]](images/9.png)
![[Ar]](images/11.png)
![[Kr]](images/13.png)
![[Xe]](images/15.png)
![[Pt]](images/16.png)
![[Rn]](images/17.png)
![[2H][2H]](images/18.png)
![[H]](images/19.png)
![[C]](images/20.png)
![[O]](images/21.png)
![[N]](images/24.png)
![[H+]](images/26.png)
![[Cl]](images/29.png)
![[F]](images/30.png)
![[CH3]](images/33.png)
![[Br]](images/36.png)
![[OH]](images/37.png)
![[C-]#[O+]](images/41.png)
![C[CH2]](images/46.png)
![[I]](images/48.png)
![[N]=O](images/50.png)
![[Si]](images/54.png)
![O[O]](images/55.png)
![[OH-]](images/57.png)
![O=[N]=O](images/60.png)
![C=[CH]](images/62.png)
![[CH2]](images/64.png)
![[SiH4]](images/68.png)
![[CH2]](images/69.png)
![O=[O+][O-]](images/70.png)
![[F-]](images/72.png)
![[NH4+].[OH-]](images/73.png)
![[C]#N](images/75.png)
![C[O]](images/77.png)
![c1cccc[c]1](images/78.png)
![[CH2]O](images/81.png)
![C[O-]](images/86.png)
![[CH2]C#C](images/87.png)
![[NH2]](images/94.png)
![[CH]=O](images/96.png)
![CC[CH2]](images/97.png)
![C[CH]C](images/103.png)
![C#[C]](images/105.png)
![C=C[CH2]](images/106.png)
![C[C]=O](images/107.png)
![[Cl-]](images/109.png)
![[CH2+]1[CH2][H]1](images/111.png)
![[CH+]=O](images/115.png)
![[O-]\[O+]=C](images/116.png)
F](images/117.png)
![[CH]](images/118.png)
![[Br-]](images/123.png)
![[OH3+]](images/124.png)
![CO[O]](images/126.png)
![[I-]](images/129.png)
[O-]](images/130.png)
![O[C]=O](images/131.png)
![[NH]](images/133.png)
![C[CH]O](images/134.png)
![[O-]](images/137.png)
![CC[O-]](images/139.png)
![[CH3+]](images/145.png)
[O-]](images/147.png)
![[CH2]CO](images/149.png)
![[S]](images/153.png)
![C#[C-]](images/155.png)
![C[NH]](images/156.png)
![C[N+]#[C-]](images/157.png)
![c1ccc(cc1)[CH2]](images/159.png)
![[CH]1C=CC=C1](images/160.png)
C](images/163.png)
![[H-]](images/165.png)
![[H]1[H+][H]1](images/167.png)
![c1cccc[c-]1](images/168.png)
![[C]F](images/171.png)
(F)(F)F](images/174.png)
![[O+]](images/175.png)
![[NH4+]](images/176.png)
![[CH2+]O](images/178.png)
![[C-]#N](images/179.png)
![[CH]=C=[CH]](images/181.png)
![[SiH3]](images/184.png)
![[Cl-]=O](images/187.png)
![CC[O]](images/191.png)
![CCO[O]](images/192.png)
![[NH]C#N](images/196.png)
![c1ccc(cc1)[C]=O](images/199.png)
![[SiH3]O](images/201.png)
![[C]=C=[C]](images/203.png)
![[CH]](images/204.png)
![C=[CH-]](images/205.png)
![CCC[CH2]](images/207.png)
![C(=O)[O-]](images/212.png)
![N#[NH+]](images/221.png)
![O=[N-]=O](images/222.png)
![[CH2]N](images/224.png)
![[N]=C=[N]](images/227.png)
![c1cccc[c+]1](images/229.png)
[O-]](images/232.png)
![[O]F](images/233.png)
![[N-]=[N+]=O](images/234.png)
![[NH2-]](images/235.png)
![[CH5+]](images/236.png)
![[CH]C](images/238.png)
![[CH]C](images/239.png)
![[CH2]C#N](images/240.png)
![C=C=[C]](images/242.png)
C](images/243.png)
![N#C[O]](images/247.png)
![N[C]=O](images/252.png)
![C=C=C=[CH]](images/254.png)
![[SiH3][SiH3]](images/255.png)
![[O]Br](images/257.png)
![N[O]](images/258.png)
![[NH]O](images/259.png)
![O=[O+]](images/260.png)
![[C]=[C]](images/261.png)
![C[CH2-]](images/262.png)
![[CH+]1[CH][H]1](images/263.png)
![[C]=C](images/264.png)
![[CH]O](images/265.png)
![C=C=[CH-]](images/268.png)
![C=C[O]](images/271.png)
![c1ccc(cc1)[O-]](images/272.png)
![[CH]=[N]=[N]](images/274.png)
![[SiH2]](images/278.png)
![[O-]Br](images/282.png)
![[H]/N=N/[H]](images/284.png)
![[CH]=N](images/285.png)
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Cl](images/1089.png)
Cl](images/1090.png)
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O[O-]](images/1170.png)
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O](images/1257.png)
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F](images/1379.png)
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O](images/1403.png)
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Cl](images/1463.png)
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O[N+](=O)[O-]](images/1468.png)
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=O](images/1678.png)
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[O-].O.O.O](images/1760.png)
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=O](images/1810.png)
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[O-].O](images/1888.png)
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[H-][SiH+2]1](images/1917.png)
[H-][SiH]1](images/1918.png)
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F](images/1940.png)
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(=O)[O]](images/1961.png)
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F](images/2022.png)
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=O](images/2093.png)
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F](images/2159.png)
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[SiH2+]1](images/2165.png)
[H][SiH]1](images/2166.png)
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[O-]](images/2179.png)
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[O-]](images/2239.png)
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[O+][O-]](images/2283.png)
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O](images/2334.png)
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F](images/2344.png)
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[O]](images/2379.png)
(=O)=O](images/2382.png)
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![[NH4+].[OH-]](images/2387.png)
![CC(=O)[O-]](images/2388.png)
![Fc1c(F)c(F)c(F)c(F)c1[F+]](images/2389.png)
![[NH]](images/2390.png)
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F](images/2402.png)
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![[NH4+].[OH-]](images/2409.png)
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![[O-]1C=CC=C1](images/2415.png)
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![CC(O)=[CH]](images/2431.png)
![CC(O)=[CH]](images/2432.png)
![CC(O)=[CH]](images/2433.png)
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[O-]](images/2440.png)
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![[NH4+].[OH-]](images/2444.png)
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O](images/2478.png)
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![CC=[O+][O-]](images/2487.png)
![N=[NH+]](images/2493.png)
![CN[CH2-]](images/2501.png)
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(F)(F)F](images/2508.png)
O](images/2509.png)
O](images/2510.png)
O](images/2511.png)
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![C=C[C]=O](images/2523.png)
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O](images/2528.png)
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O](images/2533.png)
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O](images/2570.png)
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Cl](images/2574.png)
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Cl](images/2577.png)
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O](images/2584.png)
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O](images/2597.png)
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O](images/2607.png)
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O](images/2622.png)
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[O-]](images/2724.png)
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[O-]](images/2750.png)
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[O-]](images/2760.png)
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F](images/2762.png)
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[O-]](images/2782.png)
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(F)F](images/2801.png)
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[O-]](images/2824.png)
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[H-][SiH+]1](images/2848.png)
[H-][SiH+]1](images/2849.png)
[H-][SiH+]1](images/2850.png)
[H-][SiH+2]1](images/2851.png)
[H-][SiH]1](images/2852.png)
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[O-]](images/2860.png)
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O](images/2866.png)
O](images/2867.png)
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[O-]](images/2873.png)
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[O-]](images/2887.png)
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[O-]](images/2943.png)
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[O-]](images/2955.png)
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[O-]](images/2961.png)
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[O]](images/2985.png)
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[O-]](images/2995.png)
[O-]](images/2997.png)
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[O-]](images/3023.png)
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F](images/3027.png)
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Cl](images/3064.png)
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[O-]](images/3081.png)
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=O](images/3085.png)
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=O](images/3087.png)
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(Cl)Cl](images/3095.png)
(Cl)Cl](images/3096.png)
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![[C]=[O+][C]](images/3100.png)
![H[C]OCl](images/3101.png)
![[O-]C(=O)[O-]](images/3102.png)
![H[C]OCl](images/3103.png)
![[NH4+].[OH-]](images/3106.png)
![[SH2+]](images/3108.png)
![[SH2-]](images/3109.png)
[O-]](images/3110.png)
![O=[C][Cl-]](images/3113.png)
![CO[CH]](images/3114.png)
![[C-]=NF](images/3115.png)
(=O)O](images/3117.png)
![C=[C+]O](images/3121.png)
![[O-]S(=O)(=O)[O-]](images/3122.png)
![O[O+]O](images/3124.png)
![ClO[Cl]=O](images/3131.png)
![[CH]C=C](images/3143.png)
![[C]=N[Cl-]](images/3144.png)
![C=[C-]O](images/3145.png)
![C=[C-]O](images/3155.png)
![C#CC#CC#[CH+]](images/3156.png)
(F)(F)F](images/3158.png)
[O-]](images/3159.png)
![[C]1NN1](images/3160.png)
![[C+]#CC#CC#C](images/3162.png)
![OO[Cl+]](images/3163.png)
![[C]1NN1](images/3164.png)
![[C+]1NN1](images/3165.png)
![[C+]1NN1](images/3166.png)
![[C]=C=[C-]](images/3170.png)
![C[N+]](images/3171.png)
![CC[CH]](images/3173.png)
![[NH4+].[OH-]](images/3174.png)
[O-]](images/3176.png)
![CO[CH]](images/3177.png)
![OS(=O)(=O)[O]](images/3179.png)
![OS(=O)(=O)[O]](images/3180.png)
(=O)[O]](images/3181.png)
(=O)[O]](images/3182.png)
![I[I+]](images/3183.png)
=O](images/3190.png)
![O=S([H])(=O)O](images/3208.png)
![Br[Br+]](images/3210.png)
![[OH+][N+]#[C-]](images/3211.png)
[O-]](images/3214.png)
![N#C[Cl+]](images/3215.png)
![[O]S(=O)(=O)[O]](images/3216.png)
![[O]S(=O)(=O)[O]](images/3218.png)
![[O]S(=O)(=O)[O]](images/3219.png)
![C=C[C+]1C=CC=C1](images/3221.png)
![[O]S(=O)(=O)[O]](images/3222.png)
![[H]1[H][H]1](images/3223.png)
![C#[C+]O](images/3227.png)
[O-]](images/3228.png)
![[CH]=C=[CH]](images/3229.png)
![[O-]S(=O)O[O-]](images/3230.png)
![[O-]S(=O)O[O-]](images/3231.png)
![[CH3+]S](images/3233.png)
![C#[C-]O](images/3235.png)
![[H][H].[O]](images/3236.png)
![C=[S-]](images/3237.png)
![CC[SH+]](images/3241.png)
![Cl[Cl+]Cl](images/3243.png)
![C[S+]C](images/3244.png)
![CC[C]](images/3245.png)
![O[N-]=O](images/3249.png)
![S=C=[S+]](images/3252.png)
![S=[C][S-]](images/3253.png)
F](images/3255.png)
![[C+]=S](images/3256.png)
![[C-]=S](images/3257.png)
![O[I+]](images/3258.png)
![C#C[CH-]](images/3259.png)
![[Pt-]](images/3260.png)
![[NH]C#N](images/3261.png)
![[Pt].[Pt+]](images/3262.png)
![[Pt].[Pt-]](images/3263.png)
![[NH]C#N](images/3264.png)
![[NH+]C#N](images/3265.png)
![C(=O)[N]](images/3266.png)
![[H]](images/3267.png)
![N#C[Cl-]](images/3269.png)
![[NH-]C#N](images/3270.png)
![[NH-]C#N](images/3271.png)
![[H]](images/3272.png)
![[CH2-]C=C1C=CC=C1](images/3276.png)
![[Ar+]](images/3279.png)
![[Ar][Ar+]](images/3280.png)
![[Ar++]](images/3281.png)
![[Ar][Ar]](images/3282.png)
![[Ar-]](images/3283.png)
![[Ne-]](images/3284.png)
![[Ar-]](images/3285.png)
![[He-]](images/3286.png)
![[He-]](images/3287.png)
![[He][He]](images/3288.png)
![[He][He]](images/3289.png)
![[He-]](images/3291.png)
![[He]](images/3292.png)
![[H][H]](images/3294.png)
![[Ne]](images/3295.png)
![[Ar-]](images/3297.png)
![[Ar]](images/3298.png)
![[Kr-]](images/3299.png)
![[Kr]](images/3300.png)
![[Xe]](images/3301.png)
![[Rn+]](images/3302.png)
![[Rn]](images/3303.png)
![[H+]](images/3304.png)
