Contact Info

Argonne Home > ATcT Home > Thermochemical Data > version 1.122q > > ATcT Thermochemical Values ver. 1.122q

Argonne Home

CSE Division Home

ATcT [1, 2] enthalpies of formation based on version 1.122q of the Thermochemical Network [3]

Below is a list of 0 K and 298.15 K enthalpies of formation for all 1790 species included in version This version of ATcT results was generated from an expansion of version 1.122p [4] to include an updated enthalpy of formation for oxalic acid. [5] and additional high-level computations on methyl peroxy radical [6].

The elements in their standard states are listed first; the listing order of the other species follows the actual order from the ATcT solution file, which roughly reflects the number of thermochemically-relevant determinations that include the species in question (highest first). The intent is to convey a very approximate indication of the robustness of the listed values, which is generally higher toward the top of the list and lower toward the bottom.

For species other than elements in their standard states, the 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.
(Please note that, as opposed to traditional sequential thermochemistry where the provenance of a given enthalpy of formation is typically a single measurement, the provenances of ATcT enthalpies of formation, which are obtained by analysing and solving a large Thermochemical Network, are normally quite distributed.)

If you find Active Thermochemical Tables useful in your research, please cite this website as given in Ref. [3], and, if possible, the ATcT approach as given in Refs. [1] and [2].

Species:

(chemical formulas are case sensitive)

Exact Matches only:

Website functionality credits

Species Name	Image	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
Dihydrogen		0	0	exact		2.01588 ± 0.00014	1333-74-0*0
Helium		0	0	exact		4.0026020 ± 0.0000020	7440-59-7*0
Carbon atom		0	0	exact		12.01070 ± 0.00080	7440-44-0*500
Dinitrogen		0	0	exact		28.01348 ± 0.00014	7727-37-9*0
Dioxygen		0	0	exact		31.99880 ± 0.00060	7782-44-7*0
Difluorine		0	0	exact		37.9968064 ± 0.0000010	7782-41-4*0
Neon		0	0	exact		20.17970 ± 0.00060	7440-01-9*0
Silicon		0	0	exact		28.08550 ± 0.00030	7440-21-3*500
Dichlorine		0	0	exact		70.9054 ± 0.0018	7782-50-5*0
Argon		0	0	exact		39.94800 ± 0.00100	7440-37-1*0
Dibromine		0	0	exact		159.8080 ± 0.0020	7726-95-6*500
Krypton		0	0	exact		83.8000 ± 0.1000	7439-90-9*0
Diiodine		0	0	exact		253.808940 ± 0.000060	7553-56-2*500
Xenon		0	0	exact		131.2900 ± 0.0200	7440-63-3*0
Deuterium molecule		0	0	exact		4.02820355600 ± 0.00000000080	7782-39-0*0
Hydrogen atom		216.034	217.998	± 0.000	kJ/mol	1.007940 ± 0.000070	12385-13-6*0
Carbon atom		711.397	716.882	± 0.047	kJ/mol	12.01070 ± 0.00080	7440-44-0*0
Oxygen atom		246.844	249.229	± 0.0021	kJ/mol	15.99940 ± 0.00030	17778-80-2*0
Nitrogen atom		470.579	472.442	± 0.024	kJ/mol	14.006740 ± 0.000070	17778-88-0*0
Carbon dioxide		-393.108	-393.474	± 0.015	kJ/mol	44.00950 ± 0.00100	124-38-9*0
Methane		-66.560	-74.529	± 0.050	kJ/mol	16.04246 ± 0.00085	74-82-8*0
Chlorine atom		119.621	121.302	± 0.0011	kJ/mol	35.45270 ± 0.00090	22537-15-1*0
Ethane		-68.39	-84.02	± 0.13	kJ/mol	30.0690 ± 0.0017	74-84-0*0
Fluorine atom		77.262	79.368	± 0.048	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*0
Water		-286.302	-285.830	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
Water		-238.932	-241.835	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
Hydron		1528.084	1530.047	± 0.000	kJ/mol	1.007391 ± 0.000070	12408-02-5*0
Ethylene		60.84	52.33	± 0.12	kJ/mol	28.0532 ± 0.0016	74-85-1*0
Bromine atom		117.917	111.855	± 0.056	kJ/mol	79.90400 ± 0.00100	10097-32-2*0
Methyl		149.864	146.449	± 0.056	kJ/mol	15.03452 ± 0.00083	2229-07-4*0
Methanol		-190.06	-200.95	± 0.16	kJ/mol	32.04186 ± 0.00090	67-56-1*0
Propane		-82.80	-105.08	± 0.18	kJ/mol	44.0956 ± 0.0025	74-98-6*0
Hydroxyl		37.249	37.488	± 0.026	kJ/mol	17.00734 ± 0.00031	3352-57-6*0
Hydrogen chloride		-91.989	-92.173	± 0.0062	kJ/mol	36.46064 ± 0.00090	7647-01-0*0
Carbon monoxide		-113.803	-110.523	± 0.026	kJ/mol	28.01010 ± 0.00085	630-08-0*0
Formaldehyde		-105.378	-109.217	± 0.097	kJ/mol	30.02598 ± 0.00087	50-00-0*0
Ethanol		-217.32	-235.04	± 0.22	kJ/mol	46.0684 ± 0.0017	64-17-5*0
Hydrogen fluoride		-272.670	-272.717	± 0.048	kJ/mol	20.006343 ± 0.000070	7664-39-3*0
Acetylene		228.82	228.26	± 0.13	kJ/mol	26.0373 ± 0.0016	74-86-2*0
Hydrogen bromide		-27.66	-35.51	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*0
Ammonia		-38.565	-45.558	± 0.029	kJ/mol	17.03056 ± 0.00022	7664-41-7*0
Iodine		107.157	106.757	± 0.0021	kJ/mol	126.904470 ± 0.000030	14362-44-8*0
Ethyl		131.02	119.95	± 0.26	kJ/mol	29.0611 ± 0.0016	2025-56-1*0
Hydrogen cyanide		129.660	129.276	± 0.090	kJ/mol	27.02538 ± 0.00081	74-90-8*0
Nitric oxide		90.619	91.123	± 0.065	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
Chloromethane		-74.32	-82.25	± 0.25	kJ/mol	50.4872 ± 0.0012	74-87-3*0
Propene		34.89	19.89	± 0.20	kJ/mol	42.0797 ± 0.0024	115-07-1*0
Nitrogen dioxide		36.859	34.052	± 0.065	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
Hydrogen iodide		28.646	26.470	± 0.036	kJ/mol	127.912410 ± 0.000076	10034-85-2*0
Benzene		100.61	83.10	± 0.23	kJ/mol	78.1118 ± 0.0048	71-43-2*0
Hydroxyde		-139.093	-139.059	± 0.026	kJ/mol	17.00789 ± 0.00031	14280-30-9*0
Dioxidanyl		15.12	12.22	± 0.15	kJ/mol	33.00674 ± 0.00060	3170-83-0*0
Acetaldehyde		-155.08	-165.56	± 0.25	kJ/mol	44.0526 ± 0.0017	75-07-0*0
Fluoromethane		-227.45	-235.48	± 0.23	kJ/mol	34.03292 ± 0.00083	593-53-3*0
Hydrogen peroxide		-129.479	-135.465	± 0.063	kJ/mol	34.01468 ± 0.00062	7722-84-1*0
Propyne		192.74	185.68	± 0.23	kJ/mol	40.0639 ± 0.0024	74-99-7*0
Bromomethane		-20.27	-35.67	± 0.26	kJ/mol	94.9385 ± 0.0013	74-83-9*0
n-Butane		-98.47	-125.78	± 0.25	kJ/mol	58.1222 ± 0.0033	106-97-8*0
Methylene		428.72	429.13	± 0.11	kJ/mol	14.02658 ± 0.00081	2465-56-7*2
Formic acid		-371.11	-378.43	± 0.22	kJ/mol	46.0254 ± 0.0010	64-18-6*1
Methylene		391.060	391.617	± 0.097	kJ/mol	14.02658 ± 0.00081	2465-56-7*1
Hypochlorous acid		-73.869	-76.808	± 0.027	kJ/mol	52.46004 ± 0.00095	7790-92-3*0
Tetrafluoromethane		-927.49	-933.46	± 0.25	kJ/mol	88.00431 ± 0.00080	75-73-0*0
Vinyl		301.16	296.96	± 0.32	kJ/mol	27.0452 ± 0.0016	2669-89-8*0
Dibromine		45.68	30.89	± 0.12	kJ/mol	159.8080 ± 0.0020	7726-95-6*0
Acetone		-200.11	-216.80	± 0.36	kJ/mol	58.0791 ± 0.0025	67-64-1*0
Tetrachloromethane		-93.42	-95.59	± 0.43	kJ/mol	153.8215 ± 0.0037	56-23-5*0
Methylamine		-6.62	-21.33	± 0.26	kJ/mol	31.05714 ± 0.00088	74-89-5*0
Fluoride		-250.903	-249.118	± 0.048	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*0
Ketene		-45.35	-48.47	± 0.11	kJ/mol	42.0367 ± 0.0016	463-51-4*0
Chloroethane		-96.90	-111.48	± 0.26	kJ/mol	64.5138 ± 0.0019	75-00-3*0
Phenyl		350.41	337.05	± 0.52	kJ/mol	77.1039 ± 0.0048	2396-01-2*0
Allene		197.30	189.82	± 0.25	kJ/mol	40.0639 ± 0.0024	463-49-0*0
Methylidyne		592.820	596.154	± 0.098	kJ/mol	13.01864 ± 0.00080	3315-37-5*0
Methoxide		-122.63	-130.36	± 0.28	kJ/mol	31.03447 ± 0.00088	3315-60-4*0
Nitrilomethyl		436.75	440.04	± 0.14	kJ/mol	26.01744 ± 0.00080	2074-87-5*0
Acetonitrile		81.10	74.04	± 0.25	kJ/mol	41.0520 ± 0.0016	75-05-8*0
1,3-Butadiene		125.29	110.81	± 0.34	kJ/mol	54.0904 ± 0.0032	106-99-0*0
Oxonium		605.85	599.10	± 0.17	kJ/mol	19.02267 ± 0.00037	13968-08-6*0
Diiodine		65.497	62.417	± 0.0041	kJ/mol	253.808940 ± 0.000060	7553-56-2*0
Methoxy		28.76	21.39	± 0.28	kJ/mol	31.03392 ± 0.00088	2143-68-2*0
Acetic acid		-418.86	-432.98	± 0.42	kJ/mol	60.0520 ± 0.0017	64-19-7*1
Ozone		144.397	141.735	± 0.039	kJ/mol	47.99820 ± 0.00090	10028-15-6*0
Toluene		73.29	50.00	± 0.34	kJ/mol	92.1384 ± 0.0056	108-88-3*0
Fluoroform		-689.04	-695.99	± 0.41	kJ/mol	70.01385 ± 0.00080	75-46-7*0
Trifluoromethyl		-464.95	-467.74	± 0.48	kJ/mol	69.00591 ± 0.00080	2264-21-3*0
Ethylium		914.92	902.85	± 0.30	kJ/mol	29.0606 ± 0.0016	14936-94-8*0
Phenol		-74.80	-93.39	± 0.63	kJ/mol	94.1112 ± 0.0048	108-95-2*0
Hydroxymethyl		-10.49	-16.80	± 0.28	kJ/mol	31.03392 ± 0.00088	2597-43-5*0
Chloride		-228.953	-227.346	± 0.0021	kJ/mol	35.45325 ± 0.00090	16887-00-6*0
Bromide		-206.620	-212.682	± 0.056	kJ/mol	79.90455 ± 0.00100	24959-67-9*0
Hypobromous acid		-51.53	-62.01	± 0.47	kJ/mol	96.9113 ± 0.0010	13517-11-8*0
Formyl		41.392	41.768	± 0.097	kJ/mol	29.01804 ± 0.00086	2597-44-6*0
iso-Butane		-106.02	-134.63	± 0.30	kJ/mol	58.1222 ± 0.0033	75-28-5*0
Chlorooxidanyl		101.125	101.716	± 0.035	kJ/mol	51.45210 ± 0.00095	14989-30-1*0
Oxomethylium		827.768	827.183	± 0.097	kJ/mol	29.01749 ± 0.00086	17030-74-9*0
Methyl hydroperoxide		-115.17	-127.99	± 0.50	kJ/mol	48.0413 ± 0.0010	3031-73-0*0
Imidogen		358.74	358.78	± 0.16	kJ/mol	15.014680 ± 0.000099	13774-92-0*0
Propargyl		353.97	351.37	± 0.35	kJ/mol	39.0559 ± 0.0024	2932-78-7*0
Dioxymethyl	$[O-]\[O+]=C$	111.84	104.84	± 0.62	kJ/mol	46.0254 ± 0.0010	56077-92-0*0
Difluorophosgene		-603.34	-606.44	± 0.41	kJ/mol	66.00691 ± 0.00085	353-50-4*0
Formamide		-178.54	-188.90	± 0.36	kJ/mol	45.04066 ± 0.00088	75-12-7*0
Cyanoacetylene		372.00	373.74	± 0.64	kJ/mol	51.0468 ± 0.0024	1070-71-9*0
Nitric acid		-124.49	-134.20	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*0
Amidogen		188.91	186.02	± 0.11	kJ/mol	16.02262 ± 0.00016	13770-40-6*0
Allyl		179.97	168.25	± 0.44	kJ/mol	41.0718 ± 0.0024	1981-80-2*0
Ethenol		-113.12	-124.30	± 0.52	kJ/mol	44.0526 ± 0.0017	557-75-5*1
Vinyl chloride		29.27	21.69	± 0.30	kJ/mol	62.4979 ± 0.0018	75-01-4*0
Methylium		1099.336	1095.393	± 0.051	kJ/mol	15.03397 ± 0.00083	14531-53-4*0
Iodide		-187.995	-188.396	± 0.0021	kJ/mol	126.905019 ± 0.000030	20461-54-5*0
Cyanogen chloride		134.97	135.66	± 0.46	kJ/mol	61.4701 ± 0.0012	506-77-4*0
Methylperoxy		22.05	12.60	± 0.37	kJ/mol	47.0333 ± 0.0010	2143-58-0*0
Hydroxyformyl		-181.13	-184.09	± 0.44	kJ/mol	45.0174 ± 0.0010	2564-86-5*1
Isocyanic acid		-115.98	-118.97	± 0.30	kJ/mol	43.02478 ± 0.00086	75-13-8*0
Hypofluorous acid		-84.39	-87.29	± 0.19	kJ/mol	36.00574 ± 0.00031	14034-79-8*0
Hydrogen chloride			-166.452	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*834
Ethoxide		-163.87	-178.81	± 0.48	kJ/mol	45.0610 ± 0.0017	16331-64-9*0
Dichloromethane		-86.54	-93.40	± 0.52	kJ/mol	84.9320 ± 0.0020	75-09-2*0
Chlorobenzene		67.14	52.18	± 0.61	kJ/mol	112.5566 ± 0.0049	108-90-7*0
Cyanogen bromide		187.0	180.5	± 1.1	kJ/mol	105.9214 ± 0.0013	506-68-3*0
Iodomethane		24.51	14.97	± 0.18	kJ/mol	141.93899 ± 0.00083	74-88-4*0
Trihydrogen cation		1110.304	1106.696	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*0
Oxygen atom anion		105.868	108.097	± 0.0021	kJ/mol	15.99995 ± 0.00030	14337-01-0*0
n-Propyl		118.21	100.81	± 0.52	kJ/mol	43.0877 ± 0.0024	2143-61-5*0
Acetyl		-3.60	-10.26	± 0.33	kJ/mol	43.0446 ± 0.0016	3170-69-2*0
iso-Propyl		105.19	88.31	± 0.50	kJ/mol	43.0877 ± 0.0024	2025-55-0*0
2-Hydroxyethyl		-13.35	-26.62	± 0.56	kJ/mol	45.0605 ± 0.0017	4422-54-2*1
Tetrabromomethane		133.5	103.8	± 1.3	kJ/mol	331.6267 ± 0.0041	558-13-4*0
Difluoromethane		-443.14	-450.75	± 0.33	kJ/mol	52.02339 ± 0.00081	75-10-5*0
Oxygen difluoride		26.82	24.57	± 0.24	kJ/mol	53.99621 ± 0.00030	7783-41-7*0
Hypochlorite		-118.60	-118.33	± 0.13	kJ/mol	51.45265 ± 0.00095	14380-61-1*0
Nitrosyl hydride		109.93	106.96	± 0.11	kJ/mol	31.01408 ± 0.00032	14332-28-6*0
Isocyanomethane		183.52	176.97	± 0.59	kJ/mol	41.0520 ± 0.0016	593-75-9*0
Cyclopropane		70.97	53.84	± 0.40	kJ/mol	42.0797 ± 0.0024	75-19-4*0
Propynylidene		543.39	546.39	± 0.63	kJ/mol	38.0480 ± 0.0024	67152-18-5*1
Cyclopentadiene		151.19	134.07	± 0.64	kJ/mol	66.1011 ± 0.0040	542-92-7*0
Chloroform		-97.17	-102.07	± 0.50	kJ/mol	119.3767 ± 0.0028	67-66-3*0
Fluoromethylidyne		243.14	246.74	± 0.12	kJ/mol	31.00910 ± 0.00080	3889-75-6*0
Acrylonitrile		193.75	186.99	± 0.66	kJ/mol	53.0627 ± 0.0024	107-13-1*1
Methanimine		96.47	88.56	± 0.40	kJ/mol	29.04126 ± 0.00083	2053-29-4*0
Nitrous acid		-73.005	-79.148	± 0.079	kJ/mol	47.01348 ± 0.00061	7782-77-6*1
1,2-Propadiene-1,3-diylidene		814.68	823.63	± 0.55	kJ/mol	36.0321 ± 0.0024	12075-35-3*0
Cyanic fluoride		8.77	9.10	± 0.69	kJ/mol	45.01584 ± 0.00080	1495-50-7*0
1-Hydroxyethyl		-42.76	-56.19	± 0.58	kJ/mol	45.0605 ± 0.0017	2348-46-1*1
Formate		-463.25	-466.89	± 0.56	kJ/mol	45.0180 ± 0.0010	71-47-6*0
Methyl formate		-346.88	-359.93	± 0.84	kJ/mol	60.0520 ± 0.0017	107-31-3*1
Oxygen atom cation		1560.786	1562.644	± 0.0021	kJ/mol	15.99885 ± 0.00030	14581-93-2*0
Tetrafluoroethylene		-670.99	-674.40	± 0.53	kJ/mol	100.0150 ± 0.0016	116-14-3*0
Chlorotrifluoromethane		-704.53	-709.64	± 0.57	kJ/mol	104.4586 ± 0.0012	75-72-9*0
Ethyl bromide		-41.16	-63.11	± 0.25	kJ/mol	108.9651 ± 0.0019	74-96-4*0
Vinyl bromide		88.64	73.83	± 0.58	kJ/mol	106.9492 ± 0.0019	593-60-2*0
Chlorine fluoride		-55.614	-55.709	± 0.055	kJ/mol	54.45110 ± 0.00090	7790-89-8*0
Diazynium		1042.43	1038.82	± 0.68	kJ/mol	29.02087 ± 0.00016	12357-66-3*0
Nitrite		-182.63	-185.44	± 0.46	kJ/mol	46.00609 ± 0.00060	14797-65-0*0
Hydroxylamine		-33.12	-43.50	± 0.45	kJ/mol	33.02996 ± 0.00037	7803-49-8*1
n-Butyl		102.71	80.20	± 0.71	kJ/mol	57.1143 ± 0.0033	2492-36-6*0
Hydride		143.264	145.228	± 0.000	kJ/mol	1.008489 ± 0.000070	12184-88-2*0
Methoxymethane		-166.47	-183.98	± 0.40	kJ/mol	46.0684 ± 0.0017	115-10-6*0
Methyl acetate		-394.29	-413.16	± 0.61	kJ/mol	74.0785 ± 0.0025	79-20-9*1
Phosgene		-217.45	-219.14	± 0.27	kJ/mol	98.9155 ± 0.0020	75-44-5*0
Vinyl fluoride		-134.60	-142.40	± 0.45	kJ/mol	46.0436 ± 0.0016	75-02-5*0
Phenylium		1148.42	1135.64	± 0.85	kJ/mol	77.1034 ± 0.0048	17333-73-2*0
Fluorooxidanyl		110.27	110.90	± 0.15	kJ/mol	34.99780 ± 0.00030	12061-70-0*0
Hypoiodous acid		-54.2	-58.9	± 3.1	kJ/mol	143.91181 ± 0.00031	14332-21-9*0
Methanium		921.91	911.67	± 0.45	kJ/mol	17.04985 ± 0.00087	15135-49-6*0
Oxirane		-40.07	-52.61	± 0.37	kJ/mol	44.0526 ± 0.0017	75-21-8*0
Ethynyl		563.87	567.98	± 0.14	kJ/mol	25.0293 ± 0.0016	2122-48-7*0
Cyclopropene		292.27	283.54	± 0.48	kJ/mol	40.0639 ± 0.0024	2781-85-3*0
cis-2-Butene	$C/C=C\C$	14.20	-7.08	± 0.41	kJ/mol	56.1063 ± 0.0032	590-18-1*0
Ethynide		277.41	280.82	± 0.18	kJ/mol	25.0299 ± 0.0016	29075-95-4*0
Formic acid		-354.76	-361.86	± 0.38	kJ/mol	46.0254 ± 0.0010	64-18-6*2
Methanetetraylbisamidogen		450.42	450.83	± 0.64	kJ/mol	40.02418 ± 0.00081	2669-76-3*0
Fluoroethane		-257.24	-272.11	± 0.36	kJ/mol	48.0595 ± 0.0016	353-36-6*0
Bromotrifluoromethane		-638.88	-651.00	± 0.45	kJ/mol	148.9099 ± 0.0013	75-63-8*0
Phenide		244.34	230.91	± 0.39	kJ/mol	77.1044 ± 0.0048	30922-78-2*0
Fluorobenzene		-99.09	-114.76	± 0.89	kJ/mol	96.1023 ± 0.0048	462-06-6*0
Nitromethane		-60.82	-74.72	± 0.46	kJ/mol	61.0401 ± 0.0010	75-52-5*0
Acrylonitrile		193.75	186.99	± 0.66	kJ/mol	53.0627 ± 0.0024	107-13-1*0
Chlorine dioxide		101.33	98.86	± 0.27	kJ/mol	67.4515 ± 0.0011	10049-04-4*0
Dioxygen cation		1164.585	1165.221	± 0.0092	kJ/mol	31.99825 ± 0.00060	12185-07-8*0
Ethynylene		820.33	828.79	± 0.26	kJ/mol	24.0214 ± 0.0016	12070-15-4*0
Methylidyne		664.55	667.88	± 0.59	kJ/mol	13.01864 ± 0.00080	3315-37-5*2
Ethanide		155.25	144.17	± 0.89	kJ/mol	29.0616 ± 0.0016	25013-41-6*0
Aminomethyl		159.20	149.36	± 0.38	kJ/mol	30.04920 ± 0.00085	10507-29-6*0
Cyanide		63.956	67.242	± 0.094	kJ/mol	26.01799 ± 0.00080	57-12-5*0
Cyanomethyl		263.39	260.51	± 0.69	kJ/mol	40.0440 ± 0.0016	2932-82-3*0
Peroxyformic acid		-279.38	-288.73	± 0.88	kJ/mol	62.0248 ± 0.0012	107-32-4*1
Propadienylidene		554.37	555.52	± 0.41	kJ/mol	38.0480 ± 0.0024	60731-10-4*0
Isobutene		4.05	-17.02	± 0.40	kJ/mol	56.1063 ± 0.0032	115-11-7*0
Ethoxy		1.27	-12.64	± 0.47	kJ/mol	45.0605 ± 0.0017	2154-50-9*51
Cyanooxidanyl		126.92	127.39	± 0.34	kJ/mol	42.01684 ± 0.00086	22400-26-6*0
Phenolate		-146.63	-162.10	± 0.84	kJ/mol	93.1038 ± 0.0048	3229-70-7*0
Dimethylamine		3.83	-17.81	± 0.46	kJ/mol	45.0837 ± 0.0017	124-40-3*0
Cyclopentadienyl		274.51	261.39	± 0.92	kJ/mol	65.0932 ± 0.0040	2143-53-5*0
Bromooxidanyl		131.15	123.61	± 0.28	kJ/mol	95.9034 ± 0.0010	15656-19-6*0
Hypobromite		-96.14	-103.62	± 0.53	kJ/mol	95.9039 ± 0.0010	14380-62-2*0
Hydrogen fluoride			-334.50	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*800
Ammonium		643.02	631.71	± 0.21	kJ/mol	18.03795 ± 0.00029	14798-03-9*0
(E)-Diazene		207.09	199.95	± 0.41	kJ/mol	30.02936 ± 0.00020	15626-43-4*0
Fluorodioxidanyl		26.81	25.10	± 0.26	kJ/mol	50.99720 ± 0.00060	15499-23-7*0
Peroxynitrous acid		-5.81	-14.25	± 0.36	kJ/mol	63.01288 ± 0.00091	14691-52-2*3
Ethylidene		373.50	366.27	± 0.65	kJ/mol	28.0532 ± 0.0016	4218-50-2*2
Cyanogen		308.17	310.11	± 0.41	kJ/mol	52.0349 ± 0.0016	460-19-5*0
1-Butene		21.01	0.06	± 0.36	kJ/mol	56.1063 ± 0.0032	106-98-9*0
n-Pentane		-114.41	-146.28	± 0.31	kJ/mol	72.1488 ± 0.0041	109-66-0*0
Cyclopentane		-43.87	-76.44	± 0.39	kJ/mol	70.1329 ± 0.0041	287-92-3*0
Dichloromethylene		229.51	230.69	± 0.64	kJ/mol	82.9161 ± 0.0020	1605-72-7*2
Trifluoromethylium		409.53	406.32	± 0.47	kJ/mol	69.00536 ± 0.00080	18851-76-8*0
Difluorodioxidane		35.28	31.55	± 0.41	kJ/mol	69.99561 ± 0.00060	7783-44-0*0
Dioxidanide		-88.87	-91.53	± 0.34	kJ/mol	33.00729 ± 0.00060	14691-59-9*0
Trioxidane		-82.01	-90.86	± 0.63	kJ/mol	50.01408 ± 0.00091	14699-99-1*1
Azido radical		452.27	449.68	± 0.60	kJ/mol	42.02022 ± 0.00021	12596-60-0*0
Nitrous oxide		85.997	82.568	± 0.097	kJ/mol	44.01288 ± 0.00033	10024-97-2*0
Hydroxyoxomethylium		600.62	597.54	± 0.44	kJ/mol	45.0169 ± 0.0010	638-71-1*0
Hydroxyamidogen		101.36	94.53	± 0.81	kJ/mol	32.02202 ± 0.00034	13940-32-4*1
Hydrazoic acid		297.92	291.62	± 0.49	kJ/mol	43.02816 ± 0.00022	7782-79-8*0
Water			-285.830	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
Ethylidene		361.20	354.20	± 0.51	kJ/mol	28.0532 ± 0.0016	4218-50-2*1
Vinylium		1119.01	1115.56	± 0.57	kJ/mol	27.0447 ± 0.0016	14604-48-9*0
Vinylidene		411.18	412.09	± 0.31	kJ/mol	26.0373 ± 0.0016	2143-69-3*0
Hydroxymethylium		717.65	709.71	± 0.19	kJ/mol	31.03337 ± 0.00088	18682-95-6*0
Fluoroacetylene		104.95	105.67	± 0.40	kJ/mol	44.0277 ± 0.0016	2713-09-9*0
Peroxyformyl		-100.58	-105.89	± 0.92	kJ/mol	61.0168 ± 0.0012	56240-83-6*1
n-Hexane		-130.04	-166.91	± 0.34	kJ/mol	86.1754 ± 0.0049	110-54-3*0
Ketenyl		177.06	178.15	± 0.55	kJ/mol	41.0287 ± 0.0016	51095-15-9*0
Formic acid		-371.11	-378.40	± 0.22	kJ/mol	46.0254 ± 0.0010	64-18-6*0
Methyl formate		-326.7	-339.2	± 1.1	kJ/mol	60.0520 ± 0.0017	107-31-3*2
Trichloromethyl		72.02	71.55	± 0.84	kJ/mol	118.3688 ± 0.0028	3170-80-7*0
1,1-Dichloroethane		-120.29	-133.07	± 0.44	kJ/mol	98.9586 ± 0.0024	75-34-3*0
Bromoform		75.7	49.5	± 1.3	kJ/mol	252.7306 ± 0.0031	75-25-2*0
Bromobenzene		126.7	104.6	± 1.3	kJ/mol	157.0079 ± 0.0049	108-86-1*0
Benzaldehyde		-19.34	-37.14	± 0.92	kJ/mol	106.1219 ± 0.0056	100-52-7*0
Propionaldehyde		-171.37	-186.78	± 0.25	kJ/mol	58.0791 ± 0.0025	123-38-6*0
Isocyanoacetylene		484.5	486.7	± 1.1	kJ/mol	51.0468 ± 0.0024	66723-45-3*0
Chlorous acid		25.74	20.68	± 0.63	kJ/mol	68.4594 ± 0.0011	13898-47-0*0
Iodooxidanyl		126.97	125.04	± 0.82	kJ/mol	142.90387 ± 0.00030	14696-98-1*0
Carbon monoxide cation		1238.306	1241.586	± 0.026	kJ/mol	28.00955 ± 0.00085	12144-04-6*0
Azanide		114.76	111.89	± 0.29	kJ/mol	16.02317 ± 0.00016	17655-31-1*0
Aminooxy		70.92	64.32	± 0.71	kJ/mol	32.02202 ± 0.00034	13408-29-2*0
Nitrate		-300.30	-306.84	± 0.60	kJ/mol	62.00549 ± 0.00090	14797-55-8*0
Hypofluorite		-108.84	-108.67	± 0.48	kJ/mol	34.99835 ± 0.00030	12763-66-5*0
2-Butyne		159.35	146.39	± 0.52	kJ/mol	54.0904 ± 0.0032	503-17-3*0
Cyanogen iodide		222.6	222.0	± 1.6	kJ/mol	152.92191 ± 0.00080	506-78-5*0
Formyl anion		11.60	11.98	± 0.44	kJ/mol	29.01859 ± 0.00086	57340-31-5*0
2-Propynylidyne		717.99	722.35	± 0.80	kJ/mol	37.0400 ± 0.0024	53590-28-6*0
Ethoxy		5.53	-8.90	± 0.47	kJ/mol	45.0605 ± 0.0017	2154-50-9*52
Dicarbon monoxide		377.12	381.16	± 0.83	kJ/mol	40.0208 ± 0.0016	12071-23-7*1
Chloromethylene		320.27	320.55	± 0.89	kJ/mol	48.4713 ± 0.0012	2108-20-5*2
Dibromomethane		25.9	4.5	± 1.1	kJ/mol	173.8346 ± 0.0022	74-95-3*0
1,1-Difluoroethene		-343.57	-350.63	± 0.77	kJ/mol	64.0341 ± 0.0016	75-38-7*0
3-Buten-2-one		-95.57	-111.81	± 0.87	kJ/mol	70.0898 ± 0.0032	78-94-4*1
Urea		-218.23	-234.63	± 0.42	kJ/mol	60.05534 ± 0.00091	57-13-6*0
Oxomethaniminium		695.47	688.91	± 0.88	kJ/mol	44.03217 ± 0.00087	59348-22-0*0
Chlorine trifluoride		-158.6	-162.7	± 1.2	kJ/mol	92.44791 ± 0.00090	7790-91-2*0
Iodine monochloride		19.024	17.391	± 0.013	kJ/mol	162.35717 ± 0.00090	7790-99-0*0
Iodotrifluoromethane		-583.45	-589.33	± 0.50	kJ/mol	195.91038 ± 0.00080	2314-97-8*0
Trinitrogen cation		1519.43	1516.80	± 0.89	kJ/mol	42.01967 ± 0.00021	12185-03-4*0
Oxonitrate anion		88.09	88.13	± 0.25	kJ/mol	30.00669 ± 0.00031	14967-78-3*0
Nitrosyl ion		984.487	984.482	± 0.065	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
Nitrogen sesquioxide		90.72	86.15	± 0.15	kJ/mol	76.01168 ± 0.00091	10544-73-7*0
Methylene anion		328.17	328.60	± 0.19	kJ/mol	14.02713 ± 0.00081	50928-07-9*0
Methylidyne anion		475.74	479.07	± 0.22	kJ/mol	13.01919 ± 0.00080	28604-54-8*0
Ethanium		874.32	858.06	± 0.62	kJ/mol	31.0764 ± 0.0017	24669-33-8*1
Acetylium		666.46	659.17	± 0.45	kJ/mol	43.0441 ± 0.0016	15762-07-9*0
Hydrogen isocyanide		191.94	192.32	± 0.33	kJ/mol	27.02538 ± 0.00081	6914-07-4*0
Hydroxymethylene		112.67	108.90	± 0.27	kJ/mol	30.02598 ± 0.00087	19710-56-6*1
Chloronium		881.3	878.2	± 1.1	kJ/mol	37.46803 ± 0.00091	36658-55-6*0
Carbonic acid		-602.78	-612.95	± 0.75	kJ/mol	62.0248 ± 0.0012	463-79-6*1
Hydrogen bromide			-120.65	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*800
Peroxyformate		-341.14	-346.59	± 0.95	kJ/mol	61.0174 ± 0.0012	104960-05-6*1
trans-2-Butene		9.38	-11.18	± 0.39	kJ/mol	56.1063 ± 0.0032	624-64-6*0
Isoprene		96.09	75.57	± 0.67	kJ/mol	68.1170 ± 0.0040	78-79-5*0
1-Hydroxyethylium		608.75	594.32	± 0.39	kJ/mol	45.0600 ± 0.0017	18682-96-7*1
Ethynol		95.29	92.81	± 0.80	kJ/mol	42.0367 ± 0.0016	32038-79-2*2
Formyloxidanyl		-125.91	-127.57	± 0.56	kJ/mol	45.0174 ± 0.0010	16499-21-1*1
Glyoxal		-207.75	-213.38	± 0.61	kJ/mol	58.0361 ± 0.0017	107-22-2*1
Trimethylamine		1.72	-27.14	± 0.89	kJ/mol	59.1103 ± 0.0025	75-50-3*0
1,1,1-Trichloroethane		-134.33	-144.90	± 0.48	kJ/mol	133.4033 ± 0.0031	71-55-6*0
Tetrachloroethene		-22.3	-23.2	± 1.1	kJ/mol	165.8322 ± 0.0039	127-18-4*0
Chlorodifluoromethane		-476.01	-482.20	± 0.98	kJ/mol	86.4681 ± 0.0012	75-45-6*0
Fluoromethylene		148.38	148.67	± 0.43	kJ/mol	32.01704 ± 0.00080	13453-52-6*2
Fluoroformyl		-176.62	-176.03	± 0.37	kJ/mol	47.00850 ± 0.00085	1871-24-5*0
2-Bromoethanol		-196.19	-220.25	± 0.53	kJ/mol	124.9645 ± 0.0019	540-51-2*0
Carbon suboxide		-94.9	-92.8	± 1.2	kJ/mol	68.0309 ± 0.0025	504-64-3*0
Phenoxy		70.83	55.54	± 0.84	kJ/mol	93.1033 ± 0.0048	2122-46-5*0
1-Cyanovinyl		419.0	418.9	± 1.1	kJ/mol	52.0547 ± 0.0024	15091-87-9*0
Cyanomethylene		479.9	483.3	± 1.1	kJ/mol	39.0361 ± 0.0016	2612-62-6*1
Phenylperoxy		152.9	135.9	± 1.4	kJ/mol	109.1027 ± 0.0049	91422-02-5*0
Bromonium		925.3	914.5	± 1.5	kJ/mol	81.9193 ± 0.0010	36658-54-5*0
Hydrazine		111.59	97.44	± 0.43	kJ/mol	32.04524 ± 0.00031	302-01-2*0
Methanide		141.10	137.66	± 0.24	kJ/mol	15.03507 ± 0.00083	15194-58-8*0
Methyliumyl		1393.19	1394.05	± 0.11	kJ/mol	14.02603 ± 0.00081	15091-72-2*0
Vinyl anion		237.00	232.58	± 0.82	kJ/mol	27.0458 ± 0.0016	25012-81-1*0
Ethylidyne		640.7	636.1	± 1.1	kJ/mol	27.0452 ± 0.0016	67624-57-1*2
Aminomethylium		763.90	751.93	± 0.65	kJ/mol	30.04865 ± 0.00085	488821-23-4*0
Isocyanomethanide		253.8	250.7	± 1.0	kJ/mol	40.0446 ± 0.0016	81704-80-5*0
1-Methylethylidene		315.92	302.02	± 0.99	kJ/mol	42.0797 ± 0.0024	40852-89-9*2
1-Methylethenyl		263.00	252.61	± 0.73	kJ/mol	41.0718 ± 0.0024	15552-77-9*0
Hydrogen chloride			-166.991	± 0.023	kJ/mol	36.46064 ± 0.00090	7647-01-0*800
iso-Pentane		-119.16	-153.21	± 0.43	kJ/mol	72.1488 ± 0.0041	78-78-4*0
1-Hydroxyethyl		-41.32	-54.79	± 0.80	kJ/mol	45.0605 ± 0.0017	2348-46-1*2
Protonated oxirane		725.54	709.37	± 0.62	kJ/mol	45.0600 ± 0.0017	38607-31-70
Methanediol		-379.41	-393.61	± 0.92	kJ/mol	48.0413 ± 0.0010	463-57-0*1
Trioxidanide		-120.0	-123.1	± 1.6	kJ/mol	49.00669 ± 0.00090	89965-38-8*2
Methoxyethane		-194.38	-217.27	± 0.57	kJ/mol	60.0950 ± 0.0025	540-67-0*0
Acetic acid		-397.87	-411.65	± 0.83	kJ/mol	60.0520 ± 0.0017	64-19-7*2
Acetyl chloride		-232.59	-241.59	± 0.33	kJ/mol	78.4973 ± 0.0019	75-36-5*0
Chlorohydroxymethyl		-54.8	-60.8	± 1.1	kJ/mol	65.4787 ± 0.0012	147139-06-8*1
1,1-Dichloroethene		8.94	2.95	± 0.49	kJ/mol	96.9427 ± 0.0024	75-35-4*0
Hydrogen peroxide cation		897.23	890.25	± 0.51	kJ/mol	34.01413 ± 0.00062	12325-10-9*1
Dichlorodifluoromethane		-489.46	-493.64	± 0.67	kJ/mol	120.9129 ± 0.0020	75-71-8*0
Fluorodichloromethane		-278.14	-283.59	± 0.91	kJ/mol	102.9224 ± 0.0020	75-43-4*0
Difluoromethylene		-193.90	-193.43	± 0.38	kJ/mol	50.00751 ± 0.00080	2154-59-8*2
Fluoromethylene		210.36	210.70	± 0.66	kJ/mol	32.01704 ± 0.00080	13453-52-6*1
Formyl fluoride		-378.63	-382.22	± 0.31	kJ/mol	48.01644 ± 0.00086	1493-02-3*0
Benzyl		229.96	211.15	± 0.60	kJ/mol	91.1305 ± 0.0056	2154-56-5*0
Methyl nitrite		-55.68	-67.46	± 0.46	kJ/mol	61.0401 ± 0.0010	624-91-9*2
Carbamoyl		-7.50	-13.91	± 0.83	kJ/mol	44.03272 ± 0.00087	2858-51-7*0
Acetamide		-219.50	-237.01	± 0.58	kJ/mol	59.0672 ± 0.0017	60-35-5*0
2-Cyanovinyl		447.9	445.5	± 1.2	kJ/mol	52.0547 ± 0.0024	189141-20-6*2
Dichloride		-229.8	-228.7	± 1.4	kJ/mol	70.9059 ± 0.0018	12595-89-0*0
Hypoiodite		-102.47	-104.29	± 0.88	kJ/mol	142.90442 ± 0.00030	15065-65-3*0
Dinitrogen cation		1503.311	1503.312	± 0.000	kJ/mol	28.01293 ± 0.00014	13966-04-6*0
Carbon dioxide cation		936.092	936.927	± 0.017	kJ/mol	44.00895 ± 0.00100	12181-61-2*0
Chlorine atom cation		1370.806	1372.602	± 0.0011	kJ/mol	35.45215 ± 0.00090	24203-47-2*0
Ammonium			-133.076	± 0.056	kJ/mol	18.03795 ± 0.00029	14798-03-9*800
Hydrazino		234.71	224.19	± 0.69	kJ/mol	31.03730 ± 0.00025	13598-46-4*0
Methylamidogen		187.50	176.85	± 0.47	kJ/mol	30.04920 ± 0.00085	15622-51-2*0
Methyleneamidogen		242.00	238.34	± 0.58	kJ/mol	28.03332 ± 0.00082	15845-29-1*0
(E)-Iminomethyl		275.79	272.17	± 0.61	kJ/mol	28.03332 ± 0.00082	54980-10-8*0
Hydrogen isocyanide cation		1352.9	1352.9	± 1.3	kJ/mol	27.02483 ± 0.00081	74158-11-5*0
Chloroacetylene		228.12	228.98	± 0.70	kJ/mol	60.4820 ± 0.0018	593-63-5*0
Hydroperoxonium		738.1	727.8	± 1.2	kJ/mol	35.02207 ± 0.00064	70850-26-9*1
iso-Propylium		822.86	805.78	± 0.25	kJ/mol	43.0871 ± 0.0024	19252-53-0*0
n-Propylide		122.8	105.2	± 1.2	kJ/mol	43.0882 ± 0.0024	59513-13-2*0
1-Propenyl		278.28	267.43	± 0.75	kJ/mol	41.0718 ± 0.0024	6067-68-1*2
1,2-Propadienyl anion		265.66	262.60	± 0.69	kJ/mol	39.0565 ± 0.0024	64066-06-4*0
Propargylenide		434.4	436.9	± 1.1	kJ/mol	38.0485 ± 0.0024	82906-05-6*1
t-Butyl		74.98	49.69	± 0.77	kJ/mol	57.1143 ± 0.0033	1605-73-8*0
neo-Pentane		-134.63	-167.51	± 0.40	kJ/mol	72.1488 ± 0.0041	463-82-1*0
Cyclobutane		52.31	27.77	± 0.40	kJ/mol	56.1063 ± 0.0032	287-23-0*0
Cyclobutene		177.44	160.39	± 0.72	kJ/mol	54.0904 ± 0.0032	822-35-5*0
1-Butyne		179.55	165.97	± 0.62	kJ/mol	54.0904 ± 0.0032	107-00-6*0
Chloro hypochlorite		79.78	77.97	± 0.36	kJ/mol	86.9048 ± 0.0018	7791-21-1*0
2-Hydroxyethyl		-10.80	-23.44	± 0.82	kJ/mol	45.0605 ± 0.0017	4422-54-2*2
Ketene		182.0	177.0	± 1.1	kJ/mol	42.0367 ± 0.0016	463-51-4*1
Oxoethylidene		261.1	257.6	± 1.1	kJ/mol	42.0367 ± 0.0016	39920-84-8*12
Methanediol		-369.11	-382.27	± 0.95	kJ/mol	48.0413 ± 0.0010	463-57-0*2
Chlorine pentafluoride		-226.1	-234.2	± 1.7	kJ/mol	130.44472 ± 0.00090	13637-63-3*0
Methoxyethene		-89.2	-107.1	± 1.1	kJ/mol	58.0791 ± 0.0025	107-25-5*2
Methyl acetate		-363.4	-382.2	± 1.2	kJ/mol	74.0785 ± 0.0025	79-20-9*2
Carboxymethyl		-227.4	-237.3	± 1.2	kJ/mol	59.0440 ± 0.0017	2887-46-9*1
(Methylamino)methyl		167.74	151.29	± 0.96	kJ/mol	44.0758 ± 0.0017	31277-24-4*0
Dimethylamidogen		173.8	156.5	± 1.5	kJ/mol	44.0758 ± 0.0017	15337-44-7*0
Cyanoamidogen		323.9	321.4	± 1.4	kJ/mol	41.03212 ± 0.00082	12347-01-2*0
Bromotrichloromethane		-32.71	-41.86	± 0.59	kJ/mol	198.2728 ± 0.0030	75-62-7*0
Chloromethylidyne		430.43	434.18	± 0.67	kJ/mol	47.4634 ± 0.0012	3889-76-7*0
Chloromethanol		-232.3	-242.5	± 1.2	kJ/mol	66.4866 ± 0.0013	15454-33-8*0
Chlorooxy hypochlorite		134.56	131.32	± 0.56	kJ/mol	102.9042 ± 0.0019	12292-23-8*0
Chloromethoxy		-11.9	-18.8	± 1.1	kJ/mol	65.4787 ± 0.0012	114282-89-2*0
Tetraiodomethane		332.2	327.1	± 4.1	kJ/mol	519.62858 ± 0.00081	507-25-5*0
Fluorotrichloromethane		-285.27	-288.43	± 0.78	kJ/mol	137.3672 ± 0.0028	75-69-4*0
2-Chloroethanol		-249.81	-266.52	± 0.59	kJ/mol	80.5132 ± 0.0019	107-07-3*0
o-Benzyne		468.00	459.09	± 0.87	kJ/mol	76.0960 ± 0.0048	462-80-6*2
Peroxyhypochlorous acid		3.94	-1.33	± 0.95	kJ/mol	68.4594 ± 0.0011	67952-07-2*0
Tropyl		295.7	278.3	± 1.1	kJ/mol	91.1305 ± 0.0056	3551-27-7*0
Iodobenzene		177.69	161.70	± 0.99	kJ/mol	204.0084 ± 0.0048	591-50-4*0
Acetonyl		-19.06	-31.77	± 0.98	kJ/mol	57.0712 ± 0.0024	3122-07-4*0
Trifluoroethene		-493.1	-498.1	± 1.6	kJ/mol	82.0245 ± 0.0016	359-11-5*0
Isocyanoethene		285.02	278.51	± 0.95	kJ/mol	53.0627 ± 0.0024	14668-82-7*0
1-Isocyanoethylidene		527.7	523.0	± 1.1	kJ/mol	53.0627 ± 0.0024	498544-34-62
Cyclobutadiene		435.78	427.32	± 0.90	kJ/mol	52.0746 ± 0.0032	1120-53-2*0
Nitrogen atom cation		1872.907	1875.689	± 0.024	kJ/mol	14.006191 ± 0.000070	14158-23-7*0
Dioxodiazoxane		93.0	87.9	± 1.3	kJ/mol	76.01168 ± 0.00091	122413-35-8*1
Nitric acid			-206.64	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*800
Chlorate		-207.3	-212.8	± 1.6	kJ/mol	83.4514 ± 0.0013	14866-68-3*0
Chloric acid		2.1	-5.0	± 1.6	kJ/mol	84.4588 ± 0.0013	7790-93-4*0
Isodiazene		307.51	300.43	± 0.63	kJ/mol	30.02936 ± 0.00020	28647-38-3*0
Difluoride		-291.0	-290.2	± 1.5	kJ/mol	37.9973550 ± 0.0000010	12184-85-9*0
Oxoammoniumyl		1092.46	1089.53	± 0.67	kJ/mol	31.01353 ± 0.00032	63559-87-5*0
Trioxidane		-72.74	-81.23	± 0.82	kJ/mol	50.01408 ± 0.00091	14699-99-1*2
Nitryl hydride		-36.6	-43.6	± 1.1	kJ/mol	47.01348 ± 0.00061	90266-90-3*0
Peroxynitrous acid		7.77	0.69	± 0.41	kJ/mol	63.01288 ± 0.00091	14691-52-2*1
Carbon anion		589.621	594.767	± 0.047	kJ/mol	12.01125 ± 0.00080	14337-00-9*0
Ethylidyne		508.51	504.81	± 0.80	kJ/mol	27.0452 ± 0.0016	67624-57-1*0
Ethynylium		1687.58	1690.91	± 0.16	kJ/mol	25.0288 ± 0.0016	16456-59-0*0
Methylamidogen anion		145.23	134.40	± 0.65	kJ/mol	30.04975 ± 0.00085	54448-39-4*0
Iminomethyl cation		953.3	949.2	± 1.4	kJ/mol	28.03277 ± 0.00082	196216-36-1*0
Fluoronium		774.11	771.17	± 0.88	kJ/mol	21.01373 ± 0.00014	12206-67-6*2
Water dimer		-491.084	-499.124	± 0.052	kJ/mol	36.03056 ± 0.00066	25655-83-8*0
Methylperoxy anion		-90.38	-100.52	± 0.49	kJ/mol	47.0339 ± 0.0010	35683-44-4*0
Propylidyne		492.4	482.7	± 1.2	kJ/mol	41.0718 ± 0.0024	85056-54-8*1
Cyclopropylidene		474.89	466.87	± 0.85	kJ/mol	40.0639 ± 0.0024	2143-70-6*1
Propargylium		1193.44	1190.63	± 0.35	kJ/mol	39.0554 ± 0.0024	21540-27-2*0
Propargylenide		436.9	439.4	± 1.1	kJ/mol	38.0485 ± 0.0024	82906-05-6*2
2-Propyn-1-ylium-1-ylidene		1598.1	1602.5	± 1.3	kJ/mol	37.0395 ± 0.0024	75104-46-0*0
Bromanylium		1257.778	1251.715	± 0.057	kJ/mol	79.90345 ± 0.00100	22541-56-6*0
1,2-Butadiene		175.82	162.32	± 0.46	kJ/mol	54.0904 ± 0.0032	590-19-2*0
Cyclohexane		-83.44	-123.01	± 0.33	kJ/mol	84.1595 ± 0.0049	110-82-7*0
Hydrogen fluoride			-321.05	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*818
Ethenol		-108.75	-119.45	± 0.60	kJ/mol	44.0526 ± 0.0017	557-75-5*2
Vinoxy		22.96	16.12	± 0.68	kJ/mol	43.0446 ± 0.0016	6912-06-7*0
Oxoethanide		-44.0	-49.5	± 1.3	kJ/mol	43.0452 ± 0.0016	78944-68-0*0
Oxirene		273.18	271.02	± 0.92	kJ/mol	42.0367 ± 0.0016	157-18-6*2
Hydroxyformyl		-174.31	-177.34	± 0.50	kJ/mol	45.0174 ± 0.0010	2564-86-5*2
Hydroxyformyl anion		-319.52	-322.11	± 0.58	kJ/mol	45.0180 ± 0.0010	78944-70-4*2
Ethoxyethane		-222.96	-250.38	± 0.82	kJ/mol	74.1216 ± 0.0033	60-29-7*0
2-Hydrotrioxy		299.6	293.9	± 1.2	kJ/mol	49.00614 ± 0.00090	12500-78-60
Acetone enol		-152.0	-169.4	± 1.1	kJ/mol	58.0791 ± 0.0025	29456-04-0*1
Acetate		-496.6	-505.7	± 1.2	kJ/mol	59.0446 ± 0.0017	71-50-1*0
(Dimethylamino)methyl		165.5	142.5	± 1.3	kJ/mol	58.1024 ± 0.0025	30208-47-0*0
Chloromethide		56.4	53.2	± 2.0	kJ/mol	49.4798 ± 0.0012	60291-29-4*0
Hexachloroethane		-147.0	-149.3	± 1.3	kJ/mol	236.7376 ± 0.0056	67-72-1*0
cis-1,2-Dichloroethene	$C(\Cl)=C\Cl$	3.47	-2.53	± 0.54	kJ/mol	96.9427 ± 0.0024	156-59-2*0
Dichloroacetylene		230.12	233.43	± 0.94	kJ/mol	94.9268 ± 0.0024	7572-29-4*0
Difluoromethylene		-193.90	-193.43	± 0.38	kJ/mol	50.00751 ± 0.00080	2154-59-8*0
Hexafluoroethane		-1334.13	-1342.43	± 0.98	kJ/mol	138.0118 ± 0.0016	76-16-4*0
1,1-Difluoroethane		-489.00	-502.72	± 0.56	kJ/mol	66.0500 ± 0.0016	75-37-6*0
2-Fluoroethanol		-405.85	-423.09	± 0.99	kJ/mol	64.0589 ± 0.0017	371-62-0*0
1,3-Butadiyne		457.86	459.58	± 0.76	kJ/mol	50.0587 ± 0.0032	460-12-8*0
Benzylide		141.81	122.90	± 0.43	kJ/mol	91.1310 ± 0.0056	18860-15-6*0
Ethylbenzene		58.17	29.70	± 0.55	kJ/mol	106.1650 ± 0.0064	100-41-4*0
Phenylethene		169.66	148.32	± 0.55	kJ/mol	104.1491 ± 0.0064	100-42-5*0
Phenylacetylene		332.4	317.2	± 1.1	kJ/mol	102.1332 ± 0.0064	536-74-3*0
Chlorodioxidanyl		103.91	102.82	± 0.37	kJ/mol	67.4515 ± 0.0011	17376-09-9*0
Acetonate		-187.88	-201.43	± 0.98	kJ/mol	57.0717 ± 0.0024	24262-31-5*0
Propadienone		131.95	130.31	± 0.79	kJ/mol	54.0474 ± 0.0024	61244-93-7*0
Nitrosomethane		81.3	71.4	± 1.3	kJ/mol	45.04066 ± 0.00088	865-40-7*0
1-Cyanoethylidene		475.6	470.4	± 1.1	kJ/mol	53.0627 ± 0.0024	498544-34-6*2
3-Imino-2-propen-1-ylidene		530.6	525.8	± 1.2	kJ/mol	53.0627 ± 0.0024	916765-05-4*11
2-(Methylidyneamino)ethenyl		600.6	595.5	± 1.2	kJ/mol	53.0627 ± 0.0024	123416-74-0*11
1-Cyanovinyl anion		224.3	221.5	± 1.3	kJ/mol	52.0553 ± 0.0024	36259-97-9*0
2-Cyanovinyl		447.9	445.5	± 1.1	kJ/mol	52.0547 ± 0.0024	189141-20-6*1
Perchloryl		191.69	186.01	± 0.61	kJ/mol	83.4509 ± 0.0013	13932-10-0*0
Nitroxyl		79.40	74.14	± 0.19	kJ/mol	62.00494 ± 0.00090	12033-49-7*0
Azanylium		944.272	937.317	± 0.029	kJ/mol	17.03001 ± 0.00022	19496-55-0*0
Carbon cation		1797.850	1803.448	± 0.047	kJ/mol	12.01015 ± 0.00080	14067-05-1*0
Methyliumylidene		1619.755	1623.098	± 0.053	kJ/mol	13.01809 ± 0.00080	24361-82-8*0
Ethylidyne		508.51	504.81	± 0.80	kJ/mol	27.0452 ± 0.0016	67624-57-1*1
Vinylidene anion		363.97	363.78	± 0.50	kJ/mol	26.0378 ± 0.0016	66295-36-1*0
Hypochloroperoxoous acid, hydroxy ester		49.1	42.2	± 1.9	kJ/mol	84.4588 ± 0.0013	928652-99-7*1
Cyanomethanide		114.24	111.41	± 0.69	kJ/mol	40.0446 ± 0.0016	21438-99-3*0
Iodine monobromide		49.718	40.771	± 0.067	kJ/mol	206.8085 ± 0.0010	7789-33-5*0
Methanol cation		856.79	846.46	± 0.32	kJ/mol	32.04131 ± 0.00090	12538-91-9*0
Methyloxonium		588.5	574.3	± 1.2	kJ/mol	33.04925 ± 0.00092	17836-08-7*0
Hydroxymethylene		219.3	216.4	± 1.1	kJ/mol	30.02598 ± 0.00087	19710-56-6*3
Aquacarbon		442.7	441.1	± 1.3	kJ/mol	30.02598 ± 0.00087	81434-73-3*1
Hydroxyde			-230.014	± 0.029	kJ/mol	17.00789 ± 0.00031	14280-30-9*800
Carbonic acid		-596.91	-607.02	± 0.83	kJ/mol	62.0248 ± 0.0012	463-79-6*2
Carbonic acid		-561.68	-570.53	± 0.97	kJ/mol	62.0248 ± 0.0012	463-79-6*3
Hydrogen carbonate		-720.6	-727.0	± 1.4	kJ/mol	61.0174 ± 0.0012	71-52-3*0
n-Propylium		856.95	838.67	± 0.85	kJ/mol	43.0871 ± 0.0024	19252-52-9*0
Dioxygen anion		-43.36	-42.72	± 0.17	kJ/mol	31.99935 ± 0.00060	11062-77-4*0
Propylidene		349.44	335.75	± 0.96	kJ/mol	42.0797 ± 0.0024	6700-78-3*1
Allyl anion		134.09	123.08	± 0.23	kJ/mol	41.0723 ± 0.0024	1724-46-5*0
Cyclopropyl		303.3	290.7	± 1.3	kJ/mol	41.0718 ± 0.0024	2417-82-5*0
Propylidyne		624.5	613.0	± 1.3	kJ/mol	41.0718 ± 0.0024	85056-54-8*2
1-Propynylide		264.35	260.77	± 0.70	kJ/mol	39.0565 ± 0.0024	36147-87-2*0
1-Propen-1-yl-3-ylidene		656.6	653.2	± 1.1	kJ/mol	39.0559 ± 0.0024	84654-90-0*11
sec-Butyl		90.86	66.09	± 0.87	kJ/mol	57.1143 ± 0.0033	2348-55-2*0
Oxygen atom		436.666	438.523	± 0.0021	kJ/mol	15.99940 ± 0.00030	17778-80-2*2
Oxirene		387.8	383.6	± 1.4	kJ/mol	42.0367 ± 0.0016	157-18-6*11
Oxiranylidene		213.5	209.2	± 1.4	kJ/mol	42.0367 ± 0.0016	50983-85-2*2
Dioxirane		9.40	1.74	± 0.55	kJ/mol	46.0254 ± 0.0010	157-26-6*0
Hydroxyformyl anion		-313.63	-315.43	± 0.58	kJ/mol	45.0180 ± 0.0010	78944-70-4*1
Ethoxyethene		-117.7	-141.5	± 1.5	kJ/mol	72.1057 ± 0.0033	109-92-2*2
Cyanic acid		-12.29	-15.00	± 0.48	kJ/mol	43.02478 ± 0.00086	420-05-3*0
Isofulminic acid		235.29	233.58	± 0.48	kJ/mol	43.02478 ± 0.00086	506-85-4*0
Acetic acid		-418.86	-432.99	± 0.42	kJ/mol	60.0520 ± 0.0017	64-19-7*0
Ethyl formate		-375.2	-393.9	± 1.2	kJ/mol	74.0785 ± 0.0025	109-94-4*1
Methoxyoxomethyl		-152.5	-160.6	± 1.5	kJ/mol	59.0440 ± 0.0017	16481-04-2*1
(Formyloxy)methyl		-151.9	-160.1	± 1.3	kJ/mol	59.0440 ± 0.0017	3122-12-1*1
Ethylene glycol		-369.75	-389.38	± 0.40	kJ/mol	62.0678 ± 0.0018	107-21-1*0
Dioxoethyl		-63.7	-65.1	± 1.3	kJ/mol	57.0281 ± 0.0017	702699-38-5*0
(Methylamino)methyl cation		729.05	710.43	± 0.98	kJ/mol	44.0752 ± 0.0017	31277-24-40
Diazomethyl		470.6	468.1	± 1.5	kJ/mol	41.03212 ± 0.00082	20813-32-5*0
Isocyanoamidogen		491.1	489.1	± 1.5	kJ/mol	41.03212 ± 0.00082	947408-73-3*0
Dichloromethyl		92.20	90.28	± 0.88	kJ/mol	83.9240 ± 0.0020	3474-12-2*0
Chloromethyl		118.46	115.38	± 0.87	kJ/mol	49.4793 ± 0.0012	6806-86-6*0
Methyl hypochlorite		-53.1	-63.0	± 1.4	kJ/mol	66.4866 ± 0.0013	593-78-2*0
1,2-Dichloroethane		-118.59	-130.53	± 0.54	kJ/mol	98.9586 ± 0.0024	107-06-2*0
Trioxygen difluoride		112.2	106.5	± 1.1	kJ/mol	85.99501 ± 0.00090	16829-28-0*1
Ozonide		-58.48	-60.84	± 0.21	kJ/mol	47.99875 ± 0.00090	12596-80-4*0
Chlorofluoromethane		-256.1	-263.3	± 1.1	kJ/mol	68.4777 ± 0.0012	593-70-4*0
Difluoromethyliumyl		908.19	908.62	± 0.78	kJ/mol	50.00696 ± 0.00080	54250-40-7*0
Trioxidanyl		25.32	23.33	± 0.13	kJ/mol	49.00614 ± 0.00090	12500-78-6*1
Fluoromethyliumylidene		1122.93	1126.14	± 0.46	kJ/mol	31.00855 ± 0.00080	33412-11-2*0
1,2-Difluoroacetylene		2.87	5.70	± 0.65	kJ/mol	62.0182 ± 0.0016	689-99-6*0
Formyl chloride		-179.99	-183.20	± 0.77	kJ/mol	64.4707 ± 0.0012	2565-30-2*0
Chloroformyl		-21.92	-20.53	± 0.49	kJ/mol	63.4628 ± 0.0012	2602-42-8*0
Bromochlorane		21.882	14.439	± 0.060	kJ/mol	115.3567 ± 0.0013	13863-41-7*0
o-Benzyne anion		413.62	404.51	± 0.96	kJ/mol	76.0965 ± 0.0048	100569-88-8*0
Oxidanylium		1293.188	1293.217	± 0.035	kJ/mol	17.00679 ± 0.00031	12259-29-9*0
Cycloheptene		28.17	-9.05	± 0.75	kJ/mol	96.1702 ± 0.0057	628-92-2*0
Cycloheptatriene		207.10	183.67	± 0.95	kJ/mol	92.1384 ± 0.0056	544-25-2*0
Dioxaziridinyl		355.1	352.6	± 1.4	kJ/mol	46.00554 ± 0.00060	66252-29-7*0
Fluorobenzene cation		788.89	773.87	± 0.89	kJ/mol	96.1018 ± 0.0048	34468-25-2*0
Nitrosobenzene		215.7	198.8	± 1.2	kJ/mol	107.1100 ± 0.0048	586-96-9*0
Nitromethyl		138.9	129.5	± 1.2	kJ/mol	60.0321 ± 0.0010	16787-85-2*0
2-Butanone		-217.02	-238.47	± 0.79	kJ/mol	72.1057 ± 0.0033	78-93-3*0
Methylketene		-54.7	-64.2	± 1.1	kJ/mol	56.0633 ± 0.0024	6004-44-0*0
Acrolein		-55.3	-65.7	± 1.2	kJ/mol	56.0633 ± 0.0024	107-02-8*1
Formaldoxime		30.7	20.1	± 1.4	kJ/mol	45.04066 ± 0.00088	75-17-2*1
Diazenyl		252.13	249.22	± 0.45	kJ/mol	29.02142 ± 0.00016	36882-13-0*0
Fluoride			-334.50	± 0.16	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*800
Hydroxyimidogen		217.84	214.95	± 0.78	kJ/mol	31.01408 ± 0.00032	35337-59-8*0
Peroxynitric acid		-42.6	-52.9	± 1.3	kJ/mol	79.0123 ± 0.0012	26404-66-0*0
Nitrosyl chloride		54.453	52.552	± 0.067	kJ/mol	65.45884 ± 0.00095	2696-92-6*0
Carbon dioxide		49.8	50.6	± 1.1	kJ/mol	44.00950 ± 0.00100	124-38-9*1
Methane cation		1150.670	1144.287	± 0.062	kJ/mol	16.04191 ± 0.00085	20741-88-2*0
Oxygen atom		246.844	249.229	± 0.0021	kJ/mol	15.99940 ± 0.00030	17778-80-2*1
Ethanium		874.32	858.08	± 0.62	kJ/mol	31.0764 ± 0.0017	24669-33-8*0
Acetylene cation		1328.83	1328.17	± 0.13	kJ/mol	26.0367 ± 0.0016	25641-79-6*0
1-Ethylium-1-ylidene		1329.6	1328.2	± 1.2	kJ/mol	27.0447 ± 0.0016	78949-84-5*0
Ethylidyne anion		457.0	452.9	± 1.2	kJ/mol	27.0458 ± 0.0016	117768-70-4*0
Water anion		31.3	29.8	± 3.1	kJ/mol	18.01583 ± 0.00033	12259-30-2*100
Isocyanomethyl		363.6	361.1	± 1.2	kJ/mol	40.0440 ± 0.0016	70971-59-4*0
Trioxidanylium		1070.4	1064.1	± 1.4	kJ/mol	49.00559 ± 0.00090	74241-49-9*1
Methyloxoniumylidene		1062.68	1054.87	± 0.75	kJ/mol	31.03337 ± 0.00088	58157-09-8*0
Chlorine difluoride		-47.0	-48.2	± 1.4	kJ/mol	73.44951 ± 0.00090	24801-48-7*0
Hydroxymethylene		131.09	127.35	± 0.29	kJ/mol	30.02598 ± 0.00087	19710-56-6*2
Hydroxymethylene cation		971.9	968.2	± 1.4	kJ/mol	30.02543 ± 0.00087	135395-06-1*1
Isoformyl		217.25	217.64	± 0.69	kJ/mol	29.01804 ± 0.00086	71080-92-7*0
1-Methylethylidene		326.8	313.6	± 1.2	kJ/mol	42.0797 ± 0.0024	40852-89-9*1
Allylium		964.53	952.97	± 0.44	kJ/mol	41.0713 ± 0.0024	1724-44-3*0
1-Propenyl		280.32	269.49	± 0.81	kJ/mol	41.0718 ± 0.0024	6067-68-1*1
Cycloprop-1-enyl		527.40	523.01	± 0.61	kJ/mol	39.0559 ± 0.0024	19528-44-0*0
Cycloprop-2-enylium		1080.3	1075.2	± 1.1	kJ/mol	39.0554 ± 0.0024	26810-74-2*0
Cyclopropynyl		710.96	715.08	± 0.85	kJ/mol	37.0400 ± 0.0024	119178-99-3*0
n-Butyl anion		105.8	80.9	± 1.3	kJ/mol	57.1148 ± 0.0033	79431-01-9*0
sec-Butyl anion		103.0	78.5	± 1.3	kJ/mol	57.1148 ± 0.0033	79431-00-8*0
Cyclopentene		59.46	35.19	± 0.45	kJ/mol	68.1170 ± 0.0040	142-29-0*0
n-Heptane		-145.65	-187.52	± 0.48	kJ/mol	100.2019 ± 0.0057	142-82-5*0
n-Octane		-161.42	-208.25	± 0.67	kJ/mol	114.2285 ± 0.0065	111-65-9*0
1-Hydroxyethylium		610.9	596.4	± 1.1	kJ/mol	45.0600 ± 0.0017	18682-96-7*2
Vinyl alcohol cation		778.7	767.4	± 1.3	kJ/mol	44.0520 ± 0.0017	57239-63-1*2
Oxiranyl		172.5	164.2	± 1.3	kJ/mol	43.0446 ± 0.0016	31586-84-2*0
Oxiranylium		901.1	893.2	± 1.5	kJ/mol	43.0441 ± 0.0016	57789-76-1*2
Hydrogen chloride			-165.757	± 0.025	kJ/mol	36.46064 ± 0.00090	7647-01-0*828
C=O=C		653.0	657.3	± 1.5	kJ/mol	40.0208 ± 0.0016	12071-23-71
C=O=C		721.9	726.2	± 1.6	kJ/mol	40.0208 ± 0.0016	12071-23-72
Bromide			-120.65	± 0.15	kJ/mol	79.90455 ± 0.00100	24959-67-9*800
Oxoethylidene		275.4	272.6	± 1.7	kJ/mol	42.0367 ± 0.0016	39920-84-8*2
Ethyl hydroperoxide		-143.2	-161.6	± 1.2	kJ/mol	62.0678 ± 0.0018	3031-74-1*0
Hydrogen fluoride			-321.10	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*820
Formic acid cation		721.87	714.78	± 0.26	kJ/mol	46.0248 ± 0.0010	50614-05-6*1
Azide		193.55	190.04	± 0.91	kJ/mol	42.02077 ± 0.00021	14343-69-2*0
Formyloxidanyl		-122.10	-125.45	± 0.56	kJ/mol	45.0174 ± 0.0010	16499-21-1*2
Chloryl hydride		197.6	191.2	± 1.6	kJ/mol	68.4594 ± 0.0011	174365-32-3*0
Dinitrogen pentoxide		24.43	14.86	± 0.35	kJ/mol	108.0105 ± 0.0015	10102-03-1*0
1-Propanol		-231.41	-255.26	± 0.25	kJ/mol	60.0950 ± 0.0025	71-23-8*0
Fulminic acid		170.83	169.37	± 0.49	kJ/mol	43.02478 ± 0.00086	51060-05-0*0
Hydrogen difluoride		-198.5	-198.4	± 1.2	kJ/mol	39.004746 ± 0.000070	12528-21-1*1
(Formyloxy)methyl		-136.3	-144.5	± 1.3	kJ/mol	59.0440 ± 0.0017	3122-12-1*2
Carboxymethyl		-206.7	-216.0	± 1.3	kJ/mol	59.0440 ± 0.0017	2887-46-9*2
Dimethylamide		122.2	103.8	± 1.7	kJ/mol	44.0763 ± 0.0017	34285-60-4*0
Oxoniumyl ion		978.467	975.564	± 0.028	kJ/mol	18.01473 ± 0.00033	56583-62-1*0
Iodide			-56.824	± 0.090	kJ/mol	126.905019 ± 0.000030	20461-54-5*800
1H-Triazirin-1-yl		585.9	584.1	± 2.0	kJ/mol	42.02022 ± 0.00021	912535-95-6*0
1,1,2-Trichloroethane		-136.6	-148.3	± 1.4	kJ/mol	133.4033 ± 0.0031	79-00-5*0
1,1,1,2-Tetrachloroethane		-144.5	-153.1	± 1.3	kJ/mol	167.8481 ± 0.0039	630-20-6*0
Pentachloroethyl		27.0	25.1	± 1.3	kJ/mol	201.2849 ± 0.0048	7094-17-9*0
Iodomethane			-12.17	± 0.20	kJ/mol	141.93899 ± 0.00083	74-88-4*590
Difluoromethylene		43.29	44.00	± 0.38	kJ/mol	50.00751 ± 0.00080	2154-59-8*1
Ethyl iodide		-9.41	-39.28	± 0.49	kJ/mol	155.9656 ± 0.0016	75-03-6*500
cis-1,2-Difluoroethene	$F/C=C\F$	-302.90	-309.66	± 0.90	kJ/mol	64.0341 ± 0.0016	1630-77-9*0
Fluoroethynyl		445.2	449.8	± 1.6	kJ/mol	43.0198 ± 0.0016	22533-50-2*0
Fluoro(fluorooxy)methylene		-134.8	-136.0	± 1.3	kJ/mol	66.00691 ± 0.00085	479587-30-9*2
Dibromophosgene		-97.96	-113.89	± 0.37	kJ/mol	187.8181 ± 0.0022	593-95-3*0
Benzene		50.71	49.16	± 0.23	kJ/mol	78.1118 ± 0.0048	71-43-2*500
o-Benzyne		468.00	459.09	± 0.87	kJ/mol	76.0960 ± 0.0048	462-80-6*0
m-Benzyne		526.9	518.4	± 1.2	kJ/mol	76.0960 ± 0.0048	1828-89-3*2
p-Benzyne		586.9	577.4	± 1.2	kJ/mol	76.0960 ± 0.0048	3355-34-8*2
Cycloheptane		-72.76	-118.26	± 0.53	kJ/mol	98.1861 ± 0.0057	291-64-5*0
Dioxidenium		1110.87	1107.98	± 0.11	kJ/mol	33.00619 ± 0.00060	12207-52-2*0
Benzoyl fluoride		-288.1	-304.5	± 1.5	kJ/mol	124.1124 ± 0.0056	455-32-3*0
Iodine cation		1115.549	1115.149	± 0.0062	kJ/mol	126.903921 ± 0.000030	22541-93-1*0
Bifluoride		-481.7	-480.6	± 1.9	kJ/mol	39.005295 ± 0.000070	18130-74-02
2-Cyclopropen-1-one		163.7	159.8	± 1.2	kJ/mol	54.0474 ± 0.0024	2961-80-0*0
Cyanovinylidene		581.6	584.1	± 1.2	kJ/mol	51.0468 ± 0.0024	70277-81-5*0
Isocyanovinylidene		696.8	700.1	± 1.4	kJ/mol	51.0468 ± 0.0024	737788-76-0*0
Cyanoacetylide		300.2	305.5	± 1.2	kJ/mol	50.0394 ± 0.0024	12373-53-4*0
Isocyanoethene		285.02	278.51	± 0.95	kJ/mol	53.0627 ± 0.0024	14668-82-7*1
1-Cyanoethylidene		437.5	433.7	± 1.5	kJ/mol	53.0627 ± 0.0024	498544-34-6*1
Isocyanomethylene		582.3	583.6	± 1.7	kJ/mol	39.0361 ± 0.0016	78694-65-2*1
Propargyl chloride		186.5	180.6	± 1.3	kJ/mol	74.5086 ± 0.0026	624-65-7*0
Silicon		446.23	450.57	± 0.20	kJ/mol	28.08550 ± 0.00030	7440-21-3*0
Dioxiranylidene		190.3	191.1	± 1.4	kJ/mol	44.00950 ± 0.00100	138832-57-2*0
Methylidyne		592.820	596.154	± 0.098	kJ/mol	13.01864 ± 0.00080	3315-37-5*1
Fluorohydrochlorine cation		975.3	972.3	± 2.0	kJ/mol	55.45849 ± 0.00090	70110-64-4*0
Oxofluoronium		1342.65	1342.60	± 0.81	kJ/mol	34.99725 ± 0.00030	12763-67-6*0
Chlorine fluoride cation		1165.53	1165.71	± 0.49	kJ/mol	54.45055 ± 0.00090	12432-44-9*0
Methylammonium		628.4	609.5	± 1.4	kJ/mol	32.06453 ± 0.00091	17000-00-9*0
Aminomethylene		245.9	238.2	± 1.5	kJ/mol	29.04126 ± 0.00083	35430-17-2*0
Methylimidogen		323.1	315.3	± 1.1	kJ/mol	29.04126 ± 0.00083	27770-42-9*0
Methyleneamidogen anion		192.77	189.01	± 0.91	kJ/mol	28.03387 ± 0.00082	28892-56-0*0
(Z)-Iminomethyl		294.50	291.01	± 0.90	kJ/mol	28.03332 ± 0.00082	54980-11-9*0
Aminomethylidyne		371.9	368.4	± 1.1	kJ/mol	28.03332 ± 0.00082	84654-89-7*0
Peroxychlorous acid		96.2	90.2	± 2.1	kJ/mol	84.4588 ± 0.0013	177778-92-6*1
Deuterium atom		219.804	221.717	± 0.000	kJ/mol	2.01410177800 ± 0.00000000040	16873-17-9*0
Methyleneoxonium		152.44	144.12	± 0.49	kJ/mol	32.04186 ± 0.00090	177788-17-9*0
(Z)-Diazene	$[H]/N=N\[H]$	228.81	221.67	± 0.63	kJ/mol	30.02936 ± 0.00020	15626-42-3*0
Hydroxymethylene anion		147.1	144.1	± 1.6	kJ/mol	30.02653 ± 0.00087	207914-87-2*1
Chlorine difluoride cation		998.9	996.7	± 1.7	kJ/mol	73.44896 ± 0.00090	32629-46-2*0
Hydroxymethyliumylidene		986.02	987.65	± 0.83	kJ/mol	29.01749 ± 0.00086	60528-75-8*0
Isoformyl anion		55.7	58.4	± 1.8	kJ/mol	29.01859 ± 0.00086	81747-63-9*1
Peroxyformic acid		-265.4	-273.3	± 1.6	kJ/mol	62.0248 ± 0.0012	107-32-4*2
Hydroxyoxomethoxy		-358.9	-365.0	± 1.5	kJ/mol	61.0168 ± 0.0012	38330-85-7*0
Hydroperoxycarbonyl		-73.0	-76.8	± 1.7	kJ/mol	61.0168 ± 0.0012	153751-35-0*0
Nitrosodioxaziridine		413.6	407.6	± 1.8	kJ/mol	76.01168 ± 0.00091	132871-99-9*1
Trioxidaniumyl		925.5	916.2	± 1.5	kJ/mol	50.01353 ± 0.00091	161321-37-5*2
Oxywater		64.8	58.3	± 1.3	kJ/mol	34.01468 ± 0.00062	171363-09-0*0
Perchloric acid		13.2	1.8	± 1.8	kJ/mol	100.4582 ± 0.0015	7601-90-3*0
Dinitrogen tetraoxide		20.15	10.86	± 0.14	kJ/mol	92.0111 ± 0.0012	10544-72-6*0
Propan-1-yl-3-ylidene		554.2	545.6	± 1.3	kJ/mol	41.0718 ± 0.0024	50457-59-52
1-Propenylidene		392.3	388.0	± 1.1	kJ/mol	40.0639 ± 0.0024	70277-78-0*1
1-Propynyl		528.30	526.12	± 0.70	kJ/mol	39.0559 ± 0.0024	89342-91-6*0
Hydroxyaminiumyl		1161.1	1158.2	± 1.4	kJ/mol	31.01353 ± 0.00032	63559-88-6*0
Cycloprop-2-enyl		490.22	485.67	± 0.60	kJ/mol	39.0559 ± 0.0024	28933-84-8*0
2-Propen-1-yl-3-ylidene		556.56	554.30	± 0.90	kJ/mol	39.0559 ± 0.0024	202744-74-9*0
Cyclopropenylidene		497.03	496.07	± 0.46	kJ/mol	38.0480 ± 0.0024	16165-40-5*0
2-Propynylidyne anion		540.01	544.79	± 0.83	kJ/mol	37.0406 ± 0.0024	82893-67-2*0
t-Butylium		733.76	710.48	± 0.98	kJ/mol	57.1137 ± 0.0033	14804-25-2*0
t-Butyl anion		76.1	51.3	± 1.5	kJ/mol	57.1148 ± 0.0033	65114-21-8*0
iso-Butyl		96.91	72.92	± 0.92	kJ/mol	57.1143 ± 0.0033	4630-45-9*0
Methylcyclopropane		47.8	24.5	± 1.3	kJ/mol	56.1063 ± 0.0032	594-11-6*0
Ethanol		-269.75	-277.51	± 0.22	kJ/mol	46.0684 ± 0.0017	64-17-5*500
2-Hydroxyethyl		-5.5	-17.9	± 1.3	kJ/mol	45.0605 ± 0.0017	4422-54-2*3
Hydroxyamidogen		123.4	116.8	± 1.7	kJ/mol	32.02202 ± 0.00034	13940-32-4*2
Vinyl alcohol cation		786.75	775.52	± 0.85	kJ/mol	44.0520 ± 0.0017	57239-63-1*1
Vinoxy cation		1020.1	1013.1	± 1.5	kJ/mol	43.0441 ± 0.0016	35731-40-91
Vinoxide		-153.04	-160.10	± 0.68	kJ/mol	43.0452 ± 0.0016	35731-40-9*0
2-Hydroxyethenyl		138.01	131.27	± 0.92	kJ/mol	43.0446 ± 0.0016	108665-16-3*21
Hydroxyaminylium		1019.5	1012.4	± 2.5	kJ/mol	32.02147 ± 0.00034	66097-71-0*1
Oxiranyl anion		121.2	113.2	± 1.5	kJ/mol	43.0452 ± 0.0016	72722-59-9*2
Acetic acid			-485.18	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*800
Ketene		-45.35	-48.47	± 0.11	kJ/mol	42.0367 ± 0.0016	463-51-4*2
COC vdW		589.7	598.5	± 1.5	kJ/mol	40.0208 ± 0.0016	12071-24-81
Oxirene		389.8	385.7	± 1.4	kJ/mol	42.0367 ± 0.0016	157-18-6*12
Bifluoride		-68.0	-67.6	± 1.6	kJ/mol	39.005295 ± 0.000070	18130-74-01
Formyloxoniumylidene		1017.3	1013.9	± 1.4	kJ/mol	45.0169 ± 0.0010	54375-27-8*0
Dioxymethylene		364.0	361.7	± 2.4	kJ/mol	45.0174 ± 0.0010	438586-67-5*1
2-Propanol		-249.42	-273.52	± 0.36	kJ/mol	60.0950 ± 0.0025	67-63-0*0
Dihydrogen fluoride anion		133.2	131.9	± 1.6	kJ/mol	21.01483 ± 0.00014	117339-92-1*1
Cyanate		-221.21	-221.43	± 0.53	kJ/mol	42.01739 ± 0.00086	661-20-1*0
Nitrosomethylidyne		388.8	390.2	± 1.4	kJ/mol	42.01684 ± 0.00086	82267-15-0*0
Oxazirinyl		450.0	450.7	± 1.5	kJ/mol	42.01684 ± 0.00086	228850-18-8*0
Propionic acid		-436.41	-454.31	± 0.60	kJ/mol	74.0785 ± 0.0025	79-09-4*1
2-Methoxy-2-oxoethyl		-203.4	-218.7	± 1.6	kJ/mol	73.0706 ± 0.0025	54668-31-4*1
(Acetyloxy)methyl		-200.7	-214.5	± 1.6	kJ/mol	73.0706 ± 0.0025	2887-49-2*1
Dimethylmethyleneammonium		696.4	671.3	± 1.4	kJ/mol	58.1018 ± 0.0025	28149-27-1*0
Hydrogen fluoride			-321.13	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*821
Trichloromethide		-124.8	-124.3	± 2.0	kJ/mol	118.3693 ± 0.0028	14478-07-0*0
2-Hydrotrioxy cation		1298.2	1291.5	± 1.5	kJ/mol	49.00559 ± 0.00090	74241-49-90
Dioxyamidogen		240.4	233.8	± 1.8	kJ/mol	47.01348 ± 0.00061	71843-95-3*2
1,1,2,2-Tetrachloroethane		-146.9	-156.2	± 1.5	kJ/mol	167.8481 ± 0.0039	79-34-5*0
1,1,2,2-Tetrachloroethane		-173.0	-202.0	± 1.5	kJ/mol	167.8481 ± 0.0039	79-34-5*500
Pentachloroethane			-202.9	± 2.5	kJ/mol	202.2928 ± 0.0048	76-01-7*500
Trichloroethene			-49.2	± 1.5	kJ/mol	131.3874 ± 0.0031	79-01-6*590
Tetrachloroethene			-62.9	± 1.1	kJ/mol	165.8322 ± 0.0039	127-18-4*500
Chlorine chlorite		168.6	166.2	± 1.3	kJ/mol	102.9042 ± 0.0019	105206-44-8*3
Trichloroethene		-11.3	-14.6	± 1.5	kJ/mol	131.3874 ± 0.0031	79-01-6*0
2-Hydrotrioxy anion		27.5	21.8	± 1.4	kJ/mol	49.00669 ± 0.00090	89965-38-80
Triiodide			-51.41	± 0.80	kJ/mol	380.713959 ± 0.000090	14900-04-0*800
Bromodichloromethane		-37.4	-49.1	± 1.2	kJ/mol	163.8280 ± 0.0022	75-27-4*0
Oxygen cation monohydrate		1153.3	1147.8	± 3.3	kJ/mol	34.01413 ± 0.00062	31748-17-10
Difluorodibromomethane		-364.0	-382.0	± 1.3	kJ/mol	209.8155 ± 0.0022	75-61-6*0
Dichlorodibromomethane		21.0	5.1	± 1.3	kJ/mol	242.7241 ± 0.0028	594-18-3*0
Difluorobromomethane		-411.08	-424.28	± 0.47	kJ/mol	130.9194 ± 0.0013	1511-62-2*0
Chlorosyl hydride		141.9	139.1	± 1.7	kJ/mol	52.46004 ± 0.00095	71572-35-5*0
1,2-Difluoroethane		-434.40	-447.82	± 0.81	kJ/mol	66.0500 ± 0.0016	624-72-6*0
Fluoro(fluorooxy)methylene		-37.5	-39.1	± 1.4	kJ/mol	66.00691 ± 0.00085	479587-30-9*1
Aquachlorine cation		821.8	815.0	± 1.7	kJ/mol	53.46743 ± 0.00096	142599-65-3*0
Phenylium		1250.6	1237.6	± 1.6	kJ/mol	77.1034 ± 0.0048	17333-73-2*1
Peroxynitrous acid		-0.19	-7.24	± 0.53	kJ/mol	63.01288 ± 0.00091	14691-52-2*2
Hydrogen difluoride cation		1174.3	1171.3	± 1.5	kJ/mol	39.004198 ± 0.000070	126950-54-70
Chlorobenzene cation		942.47	928.55	± 0.61	kJ/mol	112.5561 ± 0.0049	55450-32-3*0
Chlorobenzene			11.23	± 0.59	kJ/mol	112.5566 ± 0.0049	108-90-7*500
m-Chlorophenyl		319.9	309.1	± 1.6	kJ/mol	111.5487 ± 0.0049	3474-40-6*0
p-Chlorophenyl		322.8	312.0	± 1.6	kJ/mol	111.5487 ± 0.0049	2396-00-1*0
o-Chlorophenyl		327.2	316.4	± 1.6	kJ/mol	111.5487 ± 0.0049	3474-42-8*0
Bromobenzene cation		994.8	973.2	± 1.3	kJ/mol	157.0074 ± 0.0049	55450-33-4*0
Iodobenzene		112.8	112.9	± 1.1	kJ/mol	204.0084 ± 0.0048	591-50-4*500
Oxygen anion monohydrate		-239.0	-244.3	± 3.0	kJ/mol	34.01523 ± 0.00062	31748-17-1*0
Nitrobenzene		81.4	61.4	± 1.4	kJ/mol	123.1094 ± 0.0049	98-95-3*0
Methyl nitrite		-55.68	-66.35	± 0.46	kJ/mol	61.0401 ± 0.0010	624-91-9*0
1,3-Butadien-2-ol		-53.9	-70.8	± 1.6	kJ/mol	70.0898 ± 0.0032	59120-04-6*11
(E)-Diazene cation		1132.46	1125.52	± 0.64	kJ/mol	30.02881 ± 0.00020	59952-06-6*0
Formaldonitrone		78.6	67.3	± 1.5	kJ/mol	45.04066 ± 0.00088	67353-84-8*0
2-Cyclopropen-1-imine		401.8	394.1	± 1.4	kJ/mol	53.0627 ± 0.0024	31589-17-0*0
1-Isocyanovinyl		519.0	517.2	± 1.4	kJ/mol	52.0547 ± 0.0024	321850-14-0*0
Silicon carbide		-71.0	-72.1	± 1.4	kJ/mol	40.09620 ± 0.00085	409-21-2*501
Tetrafluorosilane		-1609.28	-1614.79	± 0.69	kJ/mol	104.07911 ± 0.00030	7783-61-1*0
Iminomethyl anion		237.3	233.5	± 1.8	kJ/mol	28.03387 ± 0.00082	90623-30-6*1
Chlorohydrofluorine cation		1000.8	998.1	± 2.1	kJ/mol	55.45849 ± 0.00090	70110-63-3*0
Dioxymethylidyne		299.8	301.1	± 1.7	kJ/mol	44.00950 ± 0.00100	791121-04-5*0
Diazenide		175.6	176.7	± 1.6	kJ/mol	29.02197 ± 0.00016	71004-29-0*100
Cyanogen iodide anion		86.5	88.9	± 8.1	kJ/mol	152.92246 ± 0.00080	1356929-44-6*0
Methanol		-235.31	-238.64	± 0.16	kJ/mol	32.04186 ± 0.00090	67-56-1*500
Formaldehyde cation		944.864	941.243	± 0.098	kJ/mol	30.02543 ± 0.00087	54288-05-0*0
Iodine		107.157	106.757	± 0.0021	kJ/mol	126.904470 ± 0.000030	14362-44-8*1
Isoformyl anion		267.4	268.0	± 1.6	kJ/mol	29.01859 ± 0.00086	81747-63-9*2
Fluoronium		774.11	771.17	± 0.88	kJ/mol	21.01373 ± 0.00014	12206-67-6*0
Hydrogen fluoride			-321.12	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*904
Carbide		504.74	511.31	± 0.39	kJ/mol	24.0219 ± 0.0016	12595-78-7*0
2-Propenylidene		417.4	409.9	± 1.5	kJ/mol	40.0639 ± 0.0024	19527-08-3*11
2-Propenylidene		452.59	445.45	± 0.91	kJ/mol	40.0639 ± 0.0024	19527-08-3*2
Fluoronium		1490.1	1491.5	± 1.9	kJ/mol	21.01373 ± 0.00014	12206-67-6*1
2-Cyclopropyn-1-ylidene		898.9	905.8	± 1.6	kJ/mol	36.0321 ± 0.0024	102508-15-6*1
2-Cyclopropyn-1-ylium-1-yl		1944.7	1952.6	± 1.9	kJ/mol	36.0316 ± 0.0024	154702-35-9*0
2-Cyclopropen-1-ylium-1-yl		1382.0	1380.9	± 1.1	kJ/mol	38.0474 ± 0.0024	85398-75-0*0
Propynylidene		597.6	599.3	± 1.3	kJ/mol	38.0480 ± 0.0024	67152-18-5*3
Propenediylidene		796.1	797.3	± 1.4	kJ/mol	38.0480 ± 0.0024	60731-11-5*0
n-Butylium		827.5	803.1	± 1.2	kJ/mol	57.1137 ± 0.0033	25453-90-1*0
Dihydrogen fluoride anion		-257.0	-260.1	± 1.9	kJ/mol	21.01483 ± 0.00014	117339-92-12
Dibromide		-199.2	-213.3	± 2.0	kJ/mol	159.8085 ± 0.0020	12595-70-9*0
Dioxygenyl ion monohydrate		828.5	821.4	± 2.1	kJ/mol	50.01353 ± 0.00091	11083-61-7*0
iso-Hexane		-134.65	-173.91	± 0.84	kJ/mol	86.1754 ± 0.0049	107-83-5*0
Ethyloxoniumyl		783.3	766.3	± 1.7	kJ/mol	46.0679 ± 0.0017	34480-55-2*0
1-Hydroxyethylium		608.75	594.32	± 0.39	kJ/mol	45.0600 ± 0.0017	18682-96-7*0
2-Hydroxyethylium		1019.1	1006.3	± 1.5	kJ/mol	45.0600 ± 0.0017	38607-31-7*3
Chloride			-166.991	± 0.023	kJ/mol	35.45325 ± 0.00090	16887-00-6*800
Ethyloxoniumylidene		988.7	975.0	± 1.5	kJ/mol	45.0600 ± 0.0017	54387-07-4*0
Acetaldehyde cation		831.91	821.93	± 0.26	kJ/mol	44.0520 ± 0.0017	36505-03-0*0
Oxiranylium		1233.4	1226.4	± 1.7	kJ/mol	43.0441 ± 0.0016	57789-76-1*1
Oxiranyl anion		140.9	134.9	± 1.6	kJ/mol	43.0452 ± 0.0016	72722-59-9*1
Peroxychlorite		-34.3	-34.3	± 2.0	kJ/mol	83.4514 ± 0.0013	852472-63-0*0
Ketenyl anion		-48.48	-47.55	± 0.82	kJ/mol	41.0293 ± 0.0016	64066-01-9*0
Dicarbon monoxide anion		154.18	157.82	± 0.83	kJ/mol	40.0213 ± 0.0016	87191-88-6*0
Dicarbon monoxide		440.22	444.55	± 0.83	kJ/mol	40.0208 ± 0.0016	12071-23-7*2
Fluorochlorate		-256.02	-255.42	± 0.81	kJ/mol	54.45165 ± 0.00090	12272-56-9*0
COC vdW		726.2	734.6	± 1.7	kJ/mol	40.0208 ± 0.0016	12071-24-82
C=O-C cation		1585.8	1592.9	± 2.7	kJ/mol	40.0203 ± 0.0016	83483-98-1*1
C=O=C anion		550.3	554.1	± 1.7	kJ/mol	40.0213 ± 0.0016	87191-88-60
Oxirene cation		1106.3	1102.6	± 1.9	kJ/mol	42.0361 ± 0.0016	94664-69-4*0
Ethynol		400.0	397.6	± 1.9	kJ/mol	42.0367 ± 0.0016	32038-79-2*11
Oxoethylidene		265.9	262.6	± 1.6	kJ/mol	42.0367 ± 0.0016	39920-84-8*11
Hydroperoxymethyl		72.7	65.4	± 1.4	kJ/mol	47.0333 ± 0.0010	74087-87-9*0
Nitrous acid		-71.39	-77.74	± 0.26	kJ/mol	47.01348 ± 0.00061	7782-77-6*2
Formic acid cation		723.7	716.7	± 1.2	kJ/mol	46.0248 ± 0.0010	50614-05-6*2
Formic acid anion		-256.2	-262.4	± 1.8	kJ/mol	46.0259 ± 0.0010	19066-82-1*1
Chlorosyl chloride		134.5	133.2	± 1.4	kJ/mol	86.9048 ± 0.0018	86825-56-1*0
Trihydrogen dioxide anion		-487.5	-495.8	± 1.1	kJ/mol	35.02317 ± 0.00064	12501-19-8*0
Isocyanic acid cation		1002.97	1000.31	± 0.50	kJ/mol	43.02423 ± 0.00086	444010-28-0*0
Fulminic acid cation		1215.7	1213.0	± 1.3	kJ/mol	43.02423 ± 0.00086	114766-65-3*0
Acetic acid			-484.91	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*840
Dioxygen		94.410	94.383	± 0.000	kJ/mol	31.99880 ± 0.00060	7782-44-7*2
Acetyl chloride			-272.15	± 0.33	kJ/mol	78.4973 ± 0.0019	75-36-5*500
Methyl formate			-388.50	± 0.86	kJ/mol	60.0520 ± 0.0017	107-31-3*500
Ethyl formate		-355.5	-374.6	± 1.4	kJ/mol	74.0785 ± 0.0025	109-94-4*2
2-Methoxy-2-oxoethyl		-173.4	-188.5	± 1.8	kJ/mol	73.0706 ± 0.0025	54668-31-4*2
(Acetyloxy)methyl		-174.4	-187.4	± 1.7	kJ/mol	73.0706 ± 0.0025	2887-49-2*2
NON		545.5	542.6	± 1.7	kJ/mol	44.01288 ± 0.00033	227934-46-5*0
Hydroxyoxoethenyl		24.2	22.5	± 1.8	kJ/mol	57.0281 ± 0.0017	702699-39-6*0
Oxalic acid		-720.9	-731.5	± 1.3	kJ/mol	90.0349 ± 0.0020	144-62-7*0
Hydrogen difluoride		-187.4	-187.1	± 1.6	kJ/mol	39.004746 ± 0.000070	12528-21-1*2
Isocyanomethylidyne		672.2	676.5	± 1.7	kJ/mol	38.0281 ± 0.0016	53590-27-5*0
Cyanomethylidyne		684.7	689.1	± 2.1	kJ/mol	38.0281 ± 0.0016	4120-02-9*0
Tetrachloromethane		-108.68	-128.09	± 0.43	kJ/mol	153.8215 ± 0.0037	56-23-5*500
Dichloromethylene anion		75.63	77.91	± 0.77	kJ/mol	82.9166 ± 0.0020	118364-73-1*0
Azanylium		1266.55	1264.48	± 0.11	kJ/mol	16.02207 ± 0.00016	15194-15-7*0
Dichloromethylium		894.7	891.5	± 1.2	kJ/mol	83.9235 ± 0.0020	56932-33-3*0
Dichloromethide		-40.9	-42.6	± 2.0	kJ/mol	83.9246 ± 0.0020	32180-91-9*0
Hydrogen fluoride			-321.16	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*822
Chloromethylium		962.4	958.5	± 1.2	kJ/mol	49.4787 ± 0.0012	59000-00-9*0
Chloromethylene		346.15	346.45	± 0.89	kJ/mol	48.4713 ± 0.0012	2108-20-5*1
1,2-Dichloroethane			-165.74	± 0.56	kJ/mol	98.9586 ± 0.0024	107-06-2*500
1,1-Dichloroethane			-163.87	± 0.48	kJ/mol	98.9586 ± 0.0024	75-34-3*500
Oxochloronium		1150.86	1150.69	± 0.66	kJ/mol	51.45155 ± 0.00095	12301-79-0*0
Ethylene cation		1075.16	1067.95	± 0.12	kJ/mol	28.0526 ± 0.0016	34470-02-5*0
Pentachloroethane		-151.3	-157.2	± 1.9	kJ/mol	202.2928 ± 0.0048	76-01-7*0
Triiodide		-254.3	-257.5	± 3.4	kJ/mol	380.713959 ± 0.000090	14900-04-0*0
Hydroxydioxonitrate		-193.2	-197.6	± 2.4	kJ/mol	63.01343 ± 0.00091	58875-09-5*0
Chloroform			-133.48	± 0.51	kJ/mol	119.3767 ± 0.0028	67-66-3*590
Chlorodibromomethane		18.8	-0.0	± 3.4	kJ/mol	208.2793 ± 0.0023	124-48-1*0
Tribromofluoromethane		-105.5	-129.5	± 1.5	kJ/mol	270.7211 ± 0.0031	353-54-8*0
Tribromochloromethane		77.6	54.8	± 1.5	kJ/mol	287.1754 ± 0.0032	594-15-0*0
1-Chloro ozone		226.3	223.1	± 2.3	kJ/mol	83.4509 ± 0.0013	141801-66-3*101
Bromochloromethane		-28.2	-42.2	± 1.3	kJ/mol	129.3833 ± 0.0016	74-97-5*0
Hydrogen fluoride			-321.06	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*902
Ammonia			-80.886	± 0.053	kJ/mol	17.03056 ± 0.00022	7664-41-7*1000
Fluoromethylene		148.38	148.67	± 0.43	kJ/mol	32.01704 ± 0.00080	13453-52-6*0
Azidonitrene		692.1	687.5	± 1.4	kJ/mol	56.02696 ± 0.00028	147363-92-6*2
Ethyl iodide		8.70	-7.18	± 0.49	kJ/mol	155.9656 ± 0.0016	75-03-6*0
1,2-Dibromoacetylene		333.4	322.5	± 2.3	kJ/mol	183.8294 ± 0.0026	624-61-3*0
Fluoro(fluorooxy)methylene		-97.5	-95.6	± 1.6	kJ/mol	66.00691 ± 0.00085	479587-30-9*101
Chlorite		-105.62	-107.79	± 0.35	kJ/mol	67.4520 ± 0.0011	14998-27-7*0
Fluorooxomethylium		724.9	724.6	± 1.2	kJ/mol	47.00795 ± 0.00085	38264-00-5*0
Fluoroisoformyl		-37.8	-32.4	± 1.6	kJ/mol	47.00850 ± 0.00085	1871-24-50
Ammonium nitrate		-350.29	-365.25	± 0.18	kJ/mol	80.04344 ± 0.00095	6484-52-2*500
Benzene cation		992.49	976.03	± 0.23	kJ/mol	78.1113 ± 0.0048	34504-50-2*0
Trifluoromethide		-637.6	-639.4	± 1.8	kJ/mol	69.00646 ± 0.00080	54128-17-5*0
Diiodide		-178.13	-180.72	± 0.48	kJ/mol	253.809489 ± 0.000060	12190-71-5*0
Nitronium		961.78	958.23	± 0.20	kJ/mol	46.00499 ± 0.00060	14522-82-8*0
m-Chlorophenide		172.2	162.0	± 1.6	kJ/mol	111.5492 ± 0.0049	77748-34-6*0
p-Chlorophenide		179.2	168.7	± 1.5	kJ/mol	111.5492 ± 0.0049	77748-42-6*0
o-Chlorophenide		158.2	148.3	± 1.6	kJ/mol	111.5492 ± 0.0049	72863-53-7*0
Vinylidene		610.39	610.10	± 0.50	kJ/mol	26.0373 ± 0.0016	2143-69-3*1
2-Oxopropylium		784.4	770.6	± 1.8	kJ/mol	57.0707 ± 0.0024	54088-52-7*0
Bromo hypobromite		120.5	104.0	± 1.2	kJ/mol	175.8074 ± 0.0020	21308-80-5*0
2,3-Butanedione		-310.85	-327.42	± 0.66	kJ/mol	86.0892 ± 0.0033	431-03-8*0
1,2-Dibromoethane		-11.6	-38.5	± 1.2	kJ/mol	187.8612 ± 0.0026	106-93-4*0
Peroxyimidogen		405.4	403.4	± 1.9	kJ/mol	46.00554 ± 0.00060	60488-31-50
2-Propynal		135.5	133.4	± 1.4	kJ/mol	54.0474 ± 0.0024	624-67-9*0
Fluorosyl fluoride		192.6	193.1	± 2.3	kJ/mol	53.99621 ± 0.00030	86825-57-2*1
1-Isocyanoethylidene		545.4	540.6	± 1.6	kJ/mol	53.0627 ± 0.0024	498544-34-61
3-Imino-2-propen-1-ylidene		571.8	566.8	± 1.6	kJ/mol	53.0627 ± 0.0024	916765-05-4*21
2-(Methylidyneamino)ethenyl		634.4	629.7	± 1.6	kJ/mol	53.0627 ± 0.0024	123416-74-0*21
Azete		469.4	461.3	± 1.5	kJ/mol	53.0627 ± 0.0024	287-24-1*0
Oxadiazirene		351.7	349.9	± 1.7	kJ/mol	44.01288 ± 0.00033	227934-45-4*0
2-Cyanovinylium		1517.2	1515.1	± 1.8	kJ/mol	52.0542 ± 0.0024	85398-67-0*21
2-Cyanovinyl anion		263.7	260.8	± 1.8	kJ/mol	52.0553 ± 0.0024	85398-67-02
2-Isocyanovinyl		543.1	541.2	± 1.7	kJ/mol	52.0547 ± 0.0024	225798-14-1*1
3-Oxo-1,2-propadienylidene		330.0	335.9	± 2.0	kJ/mol	52.0315 ± 0.0024	11127-17-6*0
Fulvene		231.4	215.3	± 1.4	kJ/mol	78.1118 ± 0.0048	497-20-1*0
5-Methyl-1,3-cyclopentadiene		133.4	110.4	± 1.5	kJ/mol	80.1277 ± 0.0048	96-38-8*0
Carbonic acid		-602.78	-612.09	± 0.75	kJ/mol	62.0248 ± 0.0012	463-79-6*0
Peroxyformic acid		-265.3	-273.2	± 1.5	kJ/mol	62.0248 ± 0.0012	107-32-4*3
Ethynylene cation		1965.20	1971.79	± 0.50	kJ/mol	24.0209 ± 0.0016	12595-79-8*0
Chlorine difluoride		22.5	23.9	± 1.9	kJ/mol	73.44951 ± 0.00090	91483-78-2*0
Dihydrogen cation		1488.364	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*0
Hydroxylamine cation		857.7	847.9	± 1.6	kJ/mol	33.02941 ± 0.00037	62675-55-2*0
Perchloryloxy		248.6	241.0	± 1.8	kJ/mol	99.4503 ± 0.0015	12133-63-0*0
Hydrogen fluoride			-302.40	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*590
Cyclopropylidene		544.7	535.8	± 1.5	kJ/mol	40.0639 ± 0.0024	2143-70-6*2
Trioxidaniumyl		935.2	926.1	± 1.5	kJ/mol	50.01353 ± 0.00091	161321-37-5*3
Propynylidene cation		1410.8	1413.4	± 1.3	kJ/mol	38.0474 ± 0.0024	75123-91-0*0
Propynylidene		597.3	599.1	± 1.1	kJ/mol	38.0480 ± 0.0024	67152-18-5*4
Perchlorate		-263.2	-272.1	± 2.2	kJ/mol	99.4508 ± 0.0015	14797-73-0*0
Propadienylidenide		381.11	382.01	± 0.41	kJ/mol	38.0485 ± 0.0024	109292-49-1*0
1,2-Propadien-1-ylium-1-yl		1561.6	1562.8	± 1.4	kJ/mol	38.0474 ± 0.0024	110714-00-6*0
Deuterium atom cation		1532.210	1534.123	± 0.000	kJ/mol	2.01355319809 ± 0.00000000040	14464-47-2*0
Nitrogen hydride oxide		71.2	60.0	± 1.5	kJ/mol	33.02996 ± 0.00037	38544-48-8*0
Hydrogen fluoride			-320.88	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*815
Iminomethyl anion		252.6	248.9	± 1.8	kJ/mol	28.03387 ± 0.00082	90623-30-6*2
n-Pentane		-156.05	-173.02	± 0.31	kJ/mol	72.1488 ± 0.0041	109-66-0*500
iso-Pentane			-178.43	± 0.43	kJ/mol	72.1488 ± 0.0041	78-78-4*500
neo-Pentane			-189.90	± 0.40	kJ/mol	72.1488 ± 0.0041	463-82-1*500
Cyclopentane			-105.12	± 0.39	kJ/mol	70.1329 ± 0.0041	287-92-3*590
Aminooxy cation		946.09	938.96	± 0.79	kJ/mol	32.02147 ± 0.00034	51375-41-80
Fluorosyl fluoride anion		-147.2	-146.9	± 3.0	kJ/mol	53.99675 ± 0.00030	86825-57-22
1,5-Hexadiene		108.38	83.79	± 0.40	kJ/mol	82.1436 ± 0.0049	592-42-7*0
1,3-Butadiyne-1,4-diyl		1052.47	1062.45	± 0.68	kJ/mol	48.0428 ± 0.0032	78015-07-3*0
Trioxidanylium		1085.2	1078.9	± 1.4	kJ/mol	49.00559 ± 0.00090	74241-49-9*2
Ethoxy		1.27	-12.16	± 0.47	kJ/mol	45.0605 ± 0.0017	2154-50-9*0
Dihydrogen fluoride anion		-61.9	-60.5	± 3.2	kJ/mol	21.01483 ± 0.00014	117339-92-1*2
Hydrogen cyanide cation		1442.52	1442.05	± 0.20	kJ/mol	27.02483 ± 0.00081	12601-62-6*0
Dihydrooxooxygen cation		994.8	988.1	± 1.6	kJ/mol	34.01413 ± 0.00062	177329-59-8*0
1-Hydrazinylium-1-yl		1143.4	1136.4	± 1.4	kJ/mol	30.02881 ± 0.00020	63986-30-1*0
Chlorine oxide peroxide		226.5	227.4	± 2.5	kJ/mol	83.4509 ± 0.0013	141801-67-4*100
Hydroxyaminylium		1048.5	1041.4	± 2.6	kJ/mol	32.02147 ± 0.00034	66097-71-0*2
Trioxodinitrate anion		-104.3	-107.5	± 1.9	kJ/mol	76.01223 ± 0.00091	194856-62-7*100
(E)-Diazene anion		265.5	258.7	± 2.0	kJ/mol	30.02991 ± 0.00020	59952-06-60
Hydroxyamidogen anion		90.7	84.8	± 2.8	kJ/mol	32.02257 ± 0.00034	66097-71-00
Dicarbon monoxide cation		1433.9	1439.0	± 2.1	kJ/mol	40.0203 ± 0.0016	12287-08-0*0
Nitrilomethylium		1783.15	1786.63	± 0.49	kJ/mol	26.01689 ± 0.00080	12539-57-0*0
C=O-C cation		1816.8	1820.9	± 2.0	kJ/mol	40.0203 ± 0.0016	83483-98-1*2
Oxirene anion		288.2	285.3	± 2.2	kJ/mol	42.0372 ± 0.0016	157-18-60
(Z)-Diazene cation	$[H]/N=[N+]\[H]$	1157.0	1150.1	± 1.3	kJ/mol	30.02881 ± 0.00020	86631-37-0*0
Oxoethylidene		261.1	258.2	± 1.1	kJ/mol	42.0367 ± 0.0016	39920-84-8*1
Formic acid anion		-241.2	-247.0	± 1.9	kJ/mol	46.0259 ± 0.0010	19066-82-1*2
Nitrosyl nitrate		70.6	62.3	± 1.8	kJ/mol	92.0111 ± 0.0012	15969-55-80
Dioxirane cation		1050.8	1043.1	± 2.0	kJ/mol	46.0248 ± 0.0010	232262-10-1*0
Dioxymethyl cation		1074.9	1068.5	± 1.8	kJ/mol	46.0248 ± 0.0010	232262-11-2*0
Oxadiazirine anion		95.1	95.5	± 2.9	kJ/mol	44.01343 ± 0.00033	350586-31-1*0
Dioxymethylene		341.8	339.8	± 3.0	kJ/mol	45.0174 ± 0.0010	438586-67-5*2
OH-CO vdW complex		-80.26	-76.54	± 0.88	kJ/mol	45.0174 ± 0.0010	2564-85-4100
CO-HO vdW complex		-77.4	-73.2	± 1.3	kJ/mol	45.0174 ± 0.0010	2564-84-3100
Nitrous acid		-73.005	-78.661	± 0.079	kJ/mol	47.01348 ± 0.00061	7782-77-6*0
Cyanato cation		1261.47	1261.98	± 0.58	kJ/mol	42.01629 ± 0.00086	17247-99-3*0
Ethane cation		1043.14	1029.13	± 0.59	kJ/mol	30.0685 ± 0.0017	34488-65-8*0
Nitrosomethyliumylidene		1509.6	1510.7	± 1.7	kJ/mol	42.01629 ± 0.00086	67197-19-7*0
Fulminate		59.4	59.7	± 1.8	kJ/mol	42.01739 ± 0.00086	28269-67-2*0
Acetic acid		-484.10	-483.67	± 0.18	kJ/mol	60.0520 ± 0.0017	64-19-7*500
Acetic acid			-484.71	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*825
Acetic acid			-484.90	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*835
Diazenide		347.4	344.6	± 1.6	kJ/mol	29.02197 ± 0.00016	71004-29-0*1
Hydrogen bromide			-120.16	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*834
Glyoxal		-189.30	-194.75	± 0.75	kJ/mol	58.0361 ± 0.0017	107-22-2*2
Glyoxal		-207.75	-213.31	± 0.61	kJ/mol	58.0361 ± 0.0017	107-22-2*0
Ethynediol		-18.4	-22.2	± 1.7	kJ/mol	58.0361 ± 0.0017	16005-17-7*0
Hydrogen bromide			-120.46	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*844
Dimethylaminylium		1040.2	1024.7	± 1.8	kJ/mol	44.0752 ± 0.0017	49784-85-2*0
Diisocyanogen		610.3	612.6	± 1.8	kJ/mol	52.0349 ± 0.0016	78800-21-2*0
Dichloromethylene		313.63	314.84	± 0.90	kJ/mol	82.9161 ± 0.0020	1605-72-7*1
Xenon cation		1170.354	1170.354	± 0.0062	kJ/mol	131.2895 ± 0.0200	24203-25-6*0
Chloromethyliumyl		1207.4	1207.6	± 2.0	kJ/mol	48.4708 ± 0.0012	89877-51-0*0
Chloromethylene anion		203.44	204.26	± 0.94	kJ/mol	48.4719 ± 0.0012	75466-08-9*0
Chlorohydroxymethyl		-46.1	-51.7	± 2.0	kJ/mol	65.4787 ± 0.0012	147139-06-8*2
Hydrogen fluoride			-321.18	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*823
Aminyliumyl		1659.03	1659.95	± 0.24	kJ/mol	15.014131 ± 0.000099	19067-62-0*0
1,1,2-Trichloroethane			-188.6	± 1.4	kJ/mol	133.4033 ± 0.0031	79-00-5*500
Ethylene anion		232.0	224.4	± 2.0	kJ/mol	28.0537 ± 0.0016	34527-91-8*1
1,1,1,2-Tetrachloroethane			-193.5	± 1.1	kJ/mol	167.8481 ± 0.0039	630-20-6*500
Fluorodioxidenium		1221.9	1219.5	± 2.0	kJ/mol	50.99665 ± 0.00060	139584-95-5*0
Hexachloroethane			-216.5	± 2.8	kJ/mol	236.7376 ± 0.0056	67-72-1*500
3-Chloro-3-methyl-3H-diazirine		251.4	239.5	± 2.7	kJ/mol	90.5114 ± 0.0019	4222-21-3*0
trans-1,2-Dichloroethene	$C(\Cl)=C/Cl$	5.30	-0.12	± 0.54	kJ/mol	96.9427 ± 0.0024	156-60-5*0
Fluorodioxidanide		-256.8	-256.1	± 1.9	kJ/mol	50.99775 ± 0.00060	23553-17-5*0
Dioxofluorine		524.0	523.2	± 1.0	kJ/mol	50.99720 ± 0.00060	175861-93-5*0
Fluorochlorobromomethane		-218.2	-230.9	± 4.9	kJ/mol	147.3737 ± 0.0016	593-98-6*0
Methyleneoxonium cation		827.7	818.2	± 1.7	kJ/mol	32.04131 ± 0.00090	177788-17-90
Fluoromethyliumyl		1116.6	1116.9	± 1.7	kJ/mol	32.01649 ± 0.00080	89877-52-1*0
Fluoromethylene anion		95.93	96.46	± 0.61	kJ/mol	32.01759 ± 0.00080	71267-42-0*0
Azidonitrene		660.8	657.6	± 1.6	kJ/mol	56.02696 ± 0.00028	147363-92-6*1
Polytetrafluoroethylene			-829.63	± 0.58	kJ/mol	100.0150 ± 0.0016	9002-84-0*591
Tetraoxidanyl		2.0	0.2	± 3.0	kJ/mol	65.0055 ± 0.0012	69696-93-1*100
Hydroxymethanide		9.4	2.8	± 1.7	kJ/mol	31.03447 ± 0.00088	55830-71-2*0
Trifluoride ion		-348.8	-349.7	± 2.6	kJ/mol	56.9957582 ± 0.0000015	25730-99-8*0
Hydrogen chloride			-166.683	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*841
Nitric acid			-206.32	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*839
trans-1,2-Difluoroethene		-299.66	-306.10	± 0.90	kJ/mol	64.0341 ± 0.0016	1630-78-0*0
Fluoroethynide		133.3	137.5	± 1.5	kJ/mol	43.0204 ± 0.0016	85905-56-2*0
Formyl fluoride cation		816.6	813.3	± 1.3	kJ/mol	48.01589 ± 0.00086	99766-68-4*0
Formaldehyde		-105.378	-109.217	± 0.097	kJ/mol	30.02598 ± 0.00087	50-00-0*2
Formyl fluoride		-405.1	-403.7	± 1.6	kJ/mol	47.00905 ± 0.00085	62227-71-8*0
Fluoroisoformyl cation		1347.4	1349.5	± 1.9	kJ/mol	47.00795 ± 0.00085	1871-25-60
Nitric acid		-179.01	-173.29	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*500
Hydrogen peroxide cation		930.98	924.12	± 0.98	kJ/mol	34.01413 ± 0.00062	12325-10-9*2
Fluoroniumyl ion		1275.565	1275.796	± 0.050	kJ/mol	20.005795 ± 0.000070	12381-92-9*0
1-Chloro ozone anion		-108.9	-111.4	± 2.2	kJ/mol	83.4514 ± 0.0013	224299-15-4*3
o-Benzyne cation		1392.7	1384.7	± 1.7	kJ/mol	76.0954 ± 0.0048	70220-84-7*0
Hydrofluorate ion		-75.6	-75.1	± 1.8	kJ/mol	20.006892 ± 0.000070	37249-79-9*0
m-Benzyne cation		1364.7	1356.1	± 1.8	kJ/mol	76.0954 ± 0.0048	121058-08-0*0
p-Benzyne		603.4	594.1	± 1.2	kJ/mol	76.0960 ± 0.0048	3355-34-8*1
Benzylium		929.38	909.89	± 0.60	kJ/mol	91.1299 ± 0.0056	6711-19-9*0
Bifluoride		-705.20	-709.05	± 0.36	kJ/mol	39.005295 ± 0.000070	18130-74-0*0
1,3-Cycloheptadiene		123.29	94.18	± 0.78	kJ/mol	94.1543 ± 0.0056	4054-38-0*1
Tropylium		898.0	878.2	± 1.1	kJ/mol	91.1299 ± 0.0056	26811-28-9*0
Dioxaziridinyl cation		1365.9	1363.3	± 1.7	kJ/mol	46.00499 ± 0.00060	66252-29-70
Acetylene anion		356.8	356.7	± 1.9	kJ/mol	26.0378 ± 0.0016	50443-89-5*1
Hydroxymethylene cation		986.3	982.7	± 1.6	kJ/mol	30.02543 ± 0.00087	135395-06-1*2
Hydroxymethylene cation		1482.1	1479.4	± 1.9	kJ/mol	30.02543 ± 0.00087	135395-06-1*3
Acetone enol		-147.4	-164.6	± 1.3	kJ/mol	58.0791 ± 0.0025	29456-04-0*2
Hydroxymethylene anion		160.2	157.5	± 1.7	kJ/mol	30.02653 ± 0.00087	207914-87-2*2
Dioxaziridinyl anion		295.9	293.4	± 1.7	kJ/mol	46.00609 ± 0.00060	66252-31-1*0
cis-1,2-Dibromoethene	$C(\Br)=C\Br$	121.1	100.5	± 2.1	kJ/mol	185.8453 ± 0.0026	590-11-4*0
Hydroxymethylene anion		334.0	334.8	± 2.1	kJ/mol	30.02653 ± 0.00087	207914-87-2*3
1,1-Dibromoethane		-5.1	-32.1	± 1.8	kJ/mol	187.8612 ± 0.0026	557-91-5*0
Krypton hydride cation		1106.33	1104.54	± 0.69	kJ/mol	84.8074 ± 0.1000	37276-90-7*0
Hydrogen chloride			-165.557	± 0.026	kJ/mol	36.46064 ± 0.00090	7647-01-0*825
Aquacarbon		467.6	465.5	± 1.9	kJ/mol	30.02598 ± 0.00087	81434-73-3*102
Formaldoxime		50.8	40.0	± 1.8	kJ/mol	45.04066 ± 0.00088	75-17-2*2
Peroxyimidogen cation		1409.6	1406.8	± 1.9	kJ/mol	46.00499 ± 0.00060	60488-32-60
Oxaziridine		115.8	104.0	± 2.1	kJ/mol	45.04066 ± 0.00088	6827-26-5*0
Cyanoethynyl		715.6	722.0	± 1.2	kJ/mol	50.0388 ± 0.0024	62435-43-2*0
Hydrogen fluoride			-321.03	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*901
Trioxidanyl		26.30	23.02	± 0.19	kJ/mol	49.00614 ± 0.00090	12500-78-6*2
Peroxyimidogen anion		165.0	162.6	± 1.7	kJ/mol	46.00609 ± 0.00060	60488-31-5*0
Aquacarbon cation		1196.1	1193.0	± 1.7	kJ/mol	30.02543 ± 0.00087	81434-73-30
Nirous oxide cation		1329.67	1326.78	± 0.12	kJ/mol	44.01233 ± 0.00033	12269-46-4*0
2-Methylene-2H-azirine		404.2	396.8	± 1.7	kJ/mol	53.0627 ± 0.0024	110027-86-6*0
Hydroxylamine		-15.4	-25.9	± 1.4	kJ/mol	33.02996 ± 0.00037	7803-49-8*2
2-Cyanovinylium		1517.4	1515.2	± 1.8	kJ/mol	52.0542 ± 0.0024	85398-67-0*22
2-Cyanovinyl anion		266.1	263.2	± 1.8	kJ/mol	52.0553 ± 0.0024	85398-67-01
2-Isocyanovinyl		544.6	542.6	± 1.7	kJ/mol	52.0547 ± 0.0024	225798-14-1*2
Cyanomethylene		529.5	530.6	± 1.3	kJ/mol	39.0361 ± 0.0016	2612-62-6*2
Isocyanomethylene		586.3	587.3	± 1.7	kJ/mol	39.0361 ± 0.0016	78694-65-2*2
Cyclobutenyl		335.3	322.8	± 2.2	kJ/mol	53.0825 ± 0.0032	24669-29-2*0
Butyraldehyde		-185.46	-205.83	± 0.85	kJ/mol	72.1057 ± 0.0033	123-72-8*0
Nitrosyl fluoride		-85.81	-88.18	± 0.93	kJ/mol	49.00454 ± 0.00031	7789-25-5*0
Chloroallene		181.5	174.9	± 1.6	kJ/mol	74.5086 ± 0.0026	3223-70-9*0
1-Chloropropyne		191.3	187.2	± 1.6	kJ/mol	74.5086 ± 0.0026	7747-84-4*0
Chlorine difluoride anion		-504.9	-505.7	± 1.9	kJ/mol	73.45005 ± 0.00090	16892-05-0*0
Methylcyclopentane		-69.36	-106.32	± 0.38	kJ/mol	84.1595 ± 0.0049	96-37-7*0
Dihydrogen fluoride		-55.9	-54.9	± 1.6	kJ/mol	21.01428 ± 0.00014	12592-22-2*1
1-Chloro ozone anion		-66.8	-68.7	± 2.1	kJ/mol	83.4514 ± 0.0013	224299-15-4*1
Quartz		-906.11	-911.09	± 0.94	kJ/mol	60.08430 ± 0.00067	14808-60-7*505
n-Hexane		-179.97	-198.63	± 0.34	kJ/mol	86.1754 ± 0.0049	110-54-3*500
Cyclohexane			-156.14	± 0.33	kJ/mol	84.1595 ± 0.0049	110-82-7*500
Aminooxy anion		47.4	40.5	± 1.7	kJ/mol	32.02257 ± 0.00034	51375-41-8*0
iso-Proplylide		128.5	110.1	± 1.6	kJ/mol	43.0882 ± 0.0024	25012-80-0*0
Aminomethyliumylidene		1168.3	1165.1	± 2.2	kJ/mol	28.03277 ± 0.00082	86784-42-1*0
1-Hydroxyethanide		-20.3	-33.7	± 2.2	kJ/mol	45.0610 ± 0.0017	88032-18-2*0
Nitrosyl nitrate		48.3	40.3	± 1.8	kJ/mol	92.0111 ± 0.0012	15969-55-8*1
Acetaldehyde anion		-62.2	-72.5	± 2.2	kJ/mol	44.0531 ± 0.0017	60427-04-5*0
1-Hydroxyethenyl		121.31	114.93	± 0.99	kJ/mol	43.0446 ± 0.0016	81847-74-7*0
Ozone cation		1352.871	1350.531	± 0.041	kJ/mol	47.99765 ± 0.00090	12596-82-6*0
Deuterium hydride cation		1490.498	1490.587	± 0.000	kJ/mol	3.021493 ± 0.000070	12181-16-7*0
Ketene cation		882.22	879.05	± 0.12	kJ/mol	42.0361 ± 0.0016	64999-16-2*0
Ketene anion		-16.0	-19.1	± 2.2	kJ/mol	42.0372 ± 0.0016	56391-79-8*0
Methylaminilium		1134.9	1125.1	± 2.1	kJ/mol	30.04865 ± 0.00085	49784-84-1*0
Oxoethenylium		1139.7	1142.4	± 2.1	kJ/mol	41.0282 ± 0.0016	92056-63-8*0
Trioxidanylium		1070.4	1064.2	± 1.4	kJ/mol	49.00559 ± 0.00090	74241-49-9*0
Chloroniumyl ion		1137.797	1137.731	± 0.0051	kJ/mol	36.46009 ± 0.00090	12258-94-5*0
Oxiranylidene		456.1	452.1	± 2.2	kJ/mol	42.0367 ± 0.0016	50983-85-2*1
Oxiranylidene cation		1165.4	1161.9	± 2.5	kJ/mol	42.0361 ± 0.0016	50983-85-20
Oxiranylidene anion		236.4	232.4	± 2.3	kJ/mol	42.0372 ± 0.0016	50983-86-30
Hydrooxonitrate		78.59	75.68	± 0.99	kJ/mol	31.01463 ± 0.00032	66057-02-1*0
Methyl hydroperoxide cation		833.4	819.3	± 2.2	kJ/mol	48.0407 ± 0.0010	112465-88-0*0
Dibromine			-2.16	± 0.20	kJ/mol	159.8080 ± 0.0020	7726-95-6*800
Methoxyoxoniumylidene		1013.65	1004.82	± 0.69	kJ/mol	47.0328 ± 0.0010	86475-50-5*0
Hydroxyimidogen anion		229.8	227.4	± 2.2	kJ/mol	31.01463 ± 0.00032	35337-59-80
Dioxirane anion		-173.0	-179.8	± 3.4	kJ/mol	46.0259 ± 0.0010	157-26-60
Dioxymethyl anion		54.9	49.8	± 1.4	kJ/mol	46.0259 ± 0.0010	93207-29-5*0
Hydrogen chloride			-166.637	± 0.025	kJ/mol	36.46064 ± 0.00090	7647-01-0*840
Hydrogen bromide			-120.39	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*952
Cyclopropylide		264.7	251.9	± 1.8	kJ/mol	41.0723 ± 0.0024	1724-45-4*0
H-CO2 vdW complex		-178.3	-177.5	± 2.1	kJ/mol	45.0174 ± 0.0010	2564-83-2100
Chlorosyl chloride cation		1132.6	1130.8	± 2.0	kJ/mol	86.9043 ± 0.0018	86825-56-10
Hydrogen bromide			-120.41	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*842
2-Propanol		-306.15	-318.96	± 0.36	kJ/mol	60.0950 ± 0.0025	67-63-0*500
1-Propanol		-290.53	-302.71	± 0.24	kJ/mol	60.0950 ± 0.0025	71-23-8*500
Hydroxyoxoammoniumyl		984.1	977.7	± 1.8	kJ/mol	47.01293 ± 0.00061	80371-48-8*0
Isocyanomethylium		1272.8	1270.6	± 2.2	kJ/mol	40.0435 ± 0.0016	78269-43-9*0
Dinitrogen pentoxide			-41.04	± 0.42	kJ/mol	108.0105 ± 0.0015	10102-03-1*500
1,2-Propadien-1-yl-3-ylidene anion		622.0	629.4	± 1.3	kJ/mol	36.0326 ± 0.0024	109292-47-9*0
Oxazirinyl cation		1565.4	1566.1	± 2.3	kJ/mol	42.01629 ± 0.00086	228850-18-80
Oxazirinyl anion		448.1	448.9	± 2.4	kJ/mol	42.01739 ± 0.00086	28269-68-3*0
Chlorosyl chloride anion		-185.4	-184.7	± 2.3	kJ/mol	86.9053 ± 0.0018	86825-55-00
1-Propenylidene		630.3	622.8	± 1.7	kJ/mol	40.0639 ± 0.0024	70277-78-0*2
2-Chloro ozone anion		-103.4	-105.6	± 3.2	kJ/mol	83.4514 ± 0.0013	141801-67-40
Hydrogen bromide			-120.36	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*841
1-Methoxyethenol		-284.9	-304.2	± 1.7	kJ/mol	74.0785 ± 0.0025	4453-91-2*1
Hydrogen chloride			-165.546	± 0.027	kJ/mol	36.46064 ± 0.00090	7647-01-0*953
Chloryl chloride		126.1	122.1	± 1.7	kJ/mol	102.9042 ± 0.0019	117489-73-3*0
Trifluorine cation		1529.5	1527.4	± 2.3	kJ/mol	56.9946610 ± 0.0000015	64710-22-1*0
Ethanium		888.7	870.3	± 1.8	kJ/mol	31.0764 ± 0.0017	24669-33-8*2
Ethyl formate			-426.0	± 1.2	kJ/mol	74.0785 ± 0.0025	109-94-4*500
Ethanium		895.1	877.3	± 1.9	kJ/mol	31.0764 ± 0.0017	24669-33-8*3
Propionic acid		-415.8	-433.4	± 1.4	kJ/mol	74.0785 ± 0.0025	79-09-4*2
Methylimidogen anion		321.1	313.5	± 1.4	kJ/mol	29.04181 ± 0.00083	82539-34-2*0
Cyanogen cation		1598.23	1600.45	± 0.43	kJ/mol	52.0343 ± 0.0016	37354-81-7*0
Isocyanogen		411.0	413.3	± 1.6	kJ/mol	52.0349 ± 0.0016	83951-85-3*0
Hydrogen difluoride cation		1174.3	1171.3	± 1.5	kJ/mol	39.004198 ± 0.000070	126950-54-72
Diazoethenylidene		658.7	661.3	± 1.8	kJ/mol	52.0349 ± 0.0016	130760-10-0*0
Isocyanomethyliumylidene		1615.7	1621.2	± 1.9	kJ/mol	38.0276 ± 0.0016	78271-45-1*0
Isocyanomethylidyne anion		479.2	482.9	± 2.0	kJ/mol	38.0287 ± 0.0016	53590-27-50
Cyanomethyliumylidene		1719.8	1725.3	± 2.1	kJ/mol	38.0276 ± 0.0016	76619-90-4*0
Cyanomethylidyne anion		410.0	413.7	± 2.2	kJ/mol	38.0287 ± 0.0016	12373-35-2*0
2,3-didehydro-1H-azirin-1-yl		720.3	724.4	± 2.1	kJ/mol	38.0281 ± 0.0016	439586-06-8*0
Hydrogen fluoride			-321.17	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*905
Tribromine		155.9	134.2	± 3.2	kJ/mol	239.7120 ± 0.0030	11094-39-6*0
Cyanoaminylium		1363.2	1360.1	± 2.5	kJ/mol	41.03157 ± 0.00082	205443-18-1*0
Cyanoamidogen anion		70.8	67.8	± 1.4	kJ/mol	41.03267 ± 0.00082	67131-47-9*0
Ammonium radical		190.01	179.42	± 0.43	kJ/mol	18.03850 ± 0.00029	92075-50-8*0
Cyanamide		140.8	134.5	± 1.5	kJ/mol	42.04006 ± 0.00082	420-04-2*0
Diazomethylene		579.3	580.0	± 3.8	kJ/mol	40.02418 ± 0.00081	2468-81-7*0
Hydroperoxyimidogen		103.3	99.8	± 2.4	kJ/mol	47.01348 ± 0.00061	877456-58-1*1
Trichloromethylium		854.35	852.84	± 0.93	kJ/mol	118.3683 ± 0.0028	27130-34-3*0
Peroxychloric acid		77.5	69.3	± 2.6	kJ/mol	100.4582 ± 0.0015	177778-91-5*0
Dichloromethyliumyl		1121.6	1122.6	± 1.8	kJ/mol	82.9156 ± 0.0020	55945-51-2*0
Tribromide		-287.4	-308.4	± 1.9	kJ/mol	239.7125 ± 0.0030	14522-80-6*0
Cyanogen bromide anion		58.1	54.5	± 3.8	kJ/mol	105.9220 ± 0.0013	54092-05-6*0
Hydrogen chloride			-166.712	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*951
Methyleneaminylium		1456.6	1453.0	± 2.1	kJ/mol	28.03277 ± 0.00082	53518-13-1*1
Imidogen anion		322.62	322.66	± 0.16	kJ/mol	15.015229 ± 0.000099	23841-33-0*0
Methanimine cation		1056.1	1049.3	± 1.8	kJ/mol	29.04071 ± 0.00083	65130-65-6*0
2-Cyclopropyn-1-ylidene		993.2	1000.1	± 2.5	kJ/mol	36.0321 ± 0.0024	102508-15-6*2
Ethylene anion		231.5	225.4	± 2.0	kJ/mol	28.0537 ± 0.0016	34527-91-8*2
Hydrogen fluoride			-321.07	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*903
Nitric acid cation		1029.14	1020.08	± 0.69	kJ/mol	63.01233 ± 0.00091	272109-63-4*0
Triazirinylium ion		1608.9	1605.9	± 1.6	kJ/mol	42.01967 ± 0.00021	92220-05-8*0
2-Propenylidyne anion		464.4	460.7	± 1.7	kJ/mol	39.0565 ± 0.0024	120126-89-8*0
1-Ethylium-1-yl		1182.0	1174.6	± 3.2	kJ/mol	28.0526 ± 0.0016	85944-79-2*0
Ethylidene anion		325.6	318.3	± 1.8	kJ/mol	28.0537 ± 0.0016	35829-99-3*0
Triazirine		464.1	457.7	± 2.6	kJ/mol	43.02816 ± 0.00022	157-29-9*0
Chloromethane cation		1014.96	1008.19	± 0.25	kJ/mol	50.4867 ± 0.0012	12538-71-5*0
Methanol anion		-89.1	-99.8	± 2.8	kJ/mol	32.04241 ± 0.00090	68474-04-4*0
Methanimine anion		224.4	217.2	± 2.2	kJ/mol	29.04181 ± 0.00083	127593-73-1*0
2-Propen-3-yliumylidene		1494.4	1491.4	± 1.7	kJ/mol	39.0554 ± 0.0024	84654-86-4*0
Bromofluoromethane		-197.4	-211.9	± 4.9	kJ/mol	112.9290 ± 0.0013	373-52-4*0
Hypochlorous acid cation		998.91	995.87	± 0.90	kJ/mol	52.45949 ± 0.00095	71606-47-8*0
Fluorodibromomethane		-159.7	-179.3	± 4.9	kJ/mol	191.8250 ± 0.0022	1868-53-7*0
2-Propenylidene anion		535.7	532.4	± 1.7	kJ/mol	39.0565 ± 0.0024	98705-30-7*0
Difluorochlorobromomethane		-428.9	-439.9	± 4.9	kJ/mol	165.3642 ± 0.0016	353-59-3*0
Dichlorofluorobromomethane		-228.3	-238.3	± 4.9	kJ/mol	181.8185 ± 0.0022	353-58-2*0
Dibromofluorochloromethane		-169.9	-186.8	± 4.9	kJ/mol	226.2698 ± 0.0023	353-55-9*0
Krypton cation		1350.756	1350.756	± 0.000	kJ/mol	83.7995 ± 0.1000	16915-28-9*0
Hypochlorous acid anion		198.7	198.4	± 2.5	kJ/mol	52.46059 ± 0.00095	34524-94-2*0
Ammonium chloride		-311.557	-314.718	± 0.063	kJ/mol	53.49120 ± 0.00095	12125-02-9*510
Chloryl ion		1100.15	1097.49	± 0.52	kJ/mol	67.4510 ± 0.0011	25052-55-5*0
2-Cyclopropyn-1-yl anion		664.8	672.1	± 1.6	kJ/mol	36.0326 ± 0.0024	500574-36-7*0
Chlorine difluoride cation		1346.3	1344.9	± 2.1	kJ/mol	73.44896 ± 0.00090	86825-59-4*0
Ammonium bromide		-253.41	-269.98	± 0.17	kJ/mol	97.9425 ± 0.0010	12124-97-9*510
1,2-Difluoroacetylene cation		1081.7	1084.5	± 1.3	kJ/mol	62.0177 ± 0.0016	268566-70-7*0
Hydrogen chloride			-165.946	± 0.026	kJ/mol	36.46064 ± 0.00090	7647-01-0*907
Difluorophosgene cation		653.45	650.69	± 0.51	kJ/mol	66.00636 ± 0.00085	73256-56-1*0
Formaldehyde anion		-26.7	-28.3	± 2.0	kJ/mol	30.02653 ± 0.00087	27837-46-3*0
Triiodine cation		946.1	941.0	± 4.1	kJ/mol	380.712861 ± 0.000090	12596-32-6*0
Formaldehyde		196.013	192.682	± 0.097	kJ/mol	30.02598 ± 0.00087	50-00-0*1
Propynylidene		543.39	546.39	± 0.63	kJ/mol	38.0480 ± 0.0024	67152-18-5*0
Chloro(chlorooxy)methylene		73.5	73.7	± 3.6	kJ/mol	98.9155 ± 0.0020	479587-31-0*2
Chlorohydroxymethylene		13.9	10.9	± 2.6	kJ/mol	64.4707 ± 0.0012	147723-60-2*1
(Chlorooxy)methylene		119.1	117.8	± 2.7	kJ/mol	64.4707 ± 0.0012	331419-80-8*2
Dibromophosgene			-144.12	± 0.95	kJ/mol	187.8181 ± 0.0022	593-95-3*590
2-Chloroethanol			-314.92	± 0.53	kJ/mol	80.5132 ± 0.0019	107-07-3*590
2-Bromoethanol			-274.57	± 0.47	kJ/mol	124.9645 ± 0.0019	540-51-2*590
Water			-285.831	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*589
Hydrogen fluoride			-321.06	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*888
Phenylium		1148.42	1135.64	± 0.85	kJ/mol	77.1034 ± 0.0048	17333-73-2*2
1-Cyclopropene-1,2-diyl		791.0	790.5	± 1.5	kJ/mol	38.0480 ± 0.0024	202744-75-0*0
Nitrate			-206.64	± 0.18	kJ/mol	62.00549 ± 0.00090	14797-55-8*800
m-Benzyne anion		444.0	435.1	± 1.3	kJ/mol	76.0965 ± 0.0048	249589-31-9*0
p-Benzyne anion		465.0	455.4	± 1.3	kJ/mol	76.0965 ± 0.0048	219298-17-6*0
Oxobromonium		1139.4	1131.7	± 1.5	kJ/mol	95.9029 ± 0.0010	142315-39-7*0
Tetranitrogen cation		1392.8	1392.5	± 1.5	kJ/mol	56.02641 ± 0.00028	12185-04-5*0
Cycloheptane		-126.90	-156.79	± 0.51	kJ/mol	98.1861 ± 0.0057	291-64-5*500
Cyclopropenyliumdiyl		1692.1	1695.0	± 1.9	kJ/mol	37.0395 ± 0.0024	127476-05-5*0
Ethylbenzene			-12.56	± 0.55	kJ/mol	106.1650 ± 0.0064	100-41-4*500
Phenylacetylene			273.4	± 1.1	kJ/mol	102.1332 ± 0.0064	536-74-3*500
Cyclopropynyl anion		518.08	521.07	± 0.89	kJ/mol	37.0406 ± 0.0024	136861-42-2*0
Phenyloxoniumylidene		901.4	887.1	± 2.2	kJ/mol	93.1028 ± 0.0048	41071-17-4*0
Anisole		-47.81	-72.66	± 0.80	kJ/mol	108.1378 ± 0.0056	100-66-3*0
Hydrogen fluoride			-321.13	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*890
Fluorobenzene		-151.81	-149.39	± 0.89	kJ/mol	96.1023 ± 0.0048	462-06-6*500
Carbon atom		711.397	716.882	± 0.047	kJ/mol	12.01070 ± 0.00080	7440-44-0*1
Acetylene anion		380.1	380.3	± 1.9	kJ/mol	26.0378 ± 0.0016	50443-89-5*2
Aminomethyliumyl		1039.5	1031.9	± 2.3	kJ/mol	29.04071 ± 0.00083	89302-94-3*0
Fluorine atom cation		1758.310	1760.608	± 0.048	kJ/mol	18.99785462 ± 0.00000050	14701-13-4*0
Bromobenzene			59.9	± 1.3	kJ/mol	157.0079 ± 0.0049	108-86-1*500
Bromine dioxide		167.1	157.5	± 3.0	kJ/mol	111.9028 ± 0.0012	21255-83-4*0
Hydrogen fluoride			-321.17	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*891
Acetone		-245.06	-248.18	± 0.36	kJ/mol	58.0791 ± 0.0025	67-64-1*500
Hypofluorous acid cation		1142.01	1138.99	± 0.87	kJ/mol	36.00519 ± 0.00031	90243-22-4*0
Propionaldehyde		-218.18	-216.72	± 0.29	kJ/mol	58.0791 ± 0.0025	123-38-6*500
Diazenium		968.56	957.30	± 0.73	kJ/mol	31.03675 ± 0.00025	37369-93-0*0
trans-1,2-Dibromoethene	$C(\Br)=C/Br$	121.4	101.6	± 2.1	kJ/mol	185.8453 ± 0.0026	590-12-5*0
1,1-Dibromoethene		125.3	104.9	± 2.2	kJ/mol	185.8453 ± 0.0026	593-92-0*0
Norbornadiene		267.4	241.9	± 1.0	kJ/mol	92.1384 ± 0.0056	121-46-0*0
Monoammonium succinate			-1067.97	± 0.72	kJ/mol	135.1186 ± 0.0035	38457-08-8*510
Diammonium succinate			-1182.52	± 0.48	kJ/mol	152.1492 ± 0.0035	2226-88-2*510
Hydrogen chloride			-165.979	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*829
Bicyclo[1.1.0]buta-1,3-diene-2,4-diyl		1047.50	1055.09	± 0.73	kJ/mol	48.0428 ± 0.0032	12184-80-4*0
Fluorosyl fluoride anion		-56.6	-55.7	± 2.4	kJ/mol	53.99675 ± 0.00030	86825-57-21
Acrolein		-46.6	-56.9	± 1.4	kJ/mol	56.0633 ± 0.0024	107-02-8*2
Ethenedione		14.0	16.4	± 2.3	kJ/mol	56.0202 ± 0.0017	4363-38-6*0
Ethenedione cation		909.7	912.8	± 2.3	kJ/mol	56.0197 ± 0.0017	12541-99-0*0
Methylammoniumyl		865.81	851.88	± 0.28	kJ/mol	31.05659 ± 0.00088	34516-31-9*0
Methylamine anion		84.1	69.3	± 2.8	kJ/mol	31.05769 ± 0.00088	81096-79-9*0
Aminomethyl anion		209.4	199.1	± 2.1	kJ/mol	30.04975 ± 0.00085	74215-21-7*0
Chlorine difluoride anion		-319.0	-319.0	± 2.2	kJ/mol	73.45005 ± 0.00090	91419-41-9*0
Hypofluorous acid anion		155.3	154.7	± 2.6	kJ/mol	36.00629 ± 0.00031	36505-07-4*2
Fluorosyl fluoride cation		1413.0	1413.4	± 3.5	kJ/mol	53.99566 ± 0.00030	86825-50-51
3-Imino-2-propen-1-ylidene		532.9	527.8	± 1.8	kJ/mol	53.0627 ± 0.0024	916765-05-4*12
Dioxodiazoxane		109.3	105.2	± 1.8	kJ/mol	76.01168 ± 0.00091	122413-35-8*2
3-Imino-2-propen-1-ylidene		572.5	567.3	± 2.0	kJ/mol	53.0627 ± 0.0024	916765-05-4*22
2-(Methylidyneamino)ethenyl		604.4	599.6	± 1.9	kJ/mol	53.0627 ± 0.0024	123416-74-0*12
2-(Methylidyneamino)ethenyl		637.1	632.3	± 2.0	kJ/mol	53.0627 ± 0.0024	123416-74-0*22
Peroxyhypochlorite		-249.22	-248.20	± 0.37	kJ/mol	67.4520 ± 0.0011	224299-14-3*0
1-Cyanovinylium		1318.3	1317.1	± 2.2	kJ/mol	52.0542 ± 0.0024	85399-09-3*0
Nirous oxide anion		99.2	96.7	± 1.9	kJ/mol	44.01343 ± 0.00033	12274-12-3*0
Carbon atom		833.328	838.475	± 0.047	kJ/mol	12.01070 ± 0.00080	7440-44-0*2
Dioxygen		-0.000	-0.000	± 0.000	kJ/mol	31.99880 ± 0.00060	7782-44-7*1
Aminomethylene anion		353.0	346.1	± 2.3	kJ/mol	29.04181 ± 0.00083	207914-86-1*0
Tetraoxygen		145.8	142.2	± 3.8	kJ/mol	63.9976 ± 0.0012	12596-83-7*22
Hypobromous acid cation		974.99	964.37	± 0.53	kJ/mol	96.9108 ± 0.0010	154804-02-1*0
Tetrahedrane		548.9	540.5	± 1.5	kJ/mol	52.0746 ± 0.0032	157-39-1*0
Bromine atom		117.917	111.855	± 0.056	kJ/mol	79.90400 ± 0.00100	10097-32-2*1
Cyanic azide		502.7	498.2	± 1.9	kJ/mol	68.03766 ± 0.00085	764-05-6*0
Phenyl hydroperoxide		12.9	-6.1	± 2.1	kJ/mol	110.1106 ± 0.0049	36112-26-2*0
Cyclopentene			4.41	± 0.42	kJ/mol	68.1170 ± 0.0040	142-29-0*590
Methylcyclopentane		-116.74	-138.10	± 0.38	kJ/mol	84.1595 ± 0.0049	96-37-7*500
1,2-Propadien-1-ylium-1-yl-3-ylidene		1981.5	1989.4	± 2.2	kJ/mol	36.0316 ± 0.0024	118090-85-0*1
Isopropylidene anion		282.4	268.3	± 2.0	kJ/mol	42.0803 ± 0.0024	121408-19-30
NON cation		1443.9	1444.1	± 2.8	kJ/mol	44.01233 ± 0.00033	227934-46-50
Dioxohydrazine		172.89	171.13	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*2
Dioxodiazoxane		125.7	120.4	± 2.1	kJ/mol	76.01168 ± 0.00091	122413-35-8*3
Acetic acid			-484.91	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*839
Trifluorine		80.6	81.9	± 2.6	kJ/mol	56.9952096 ± 0.0000015	73455-86-4*0
Methyl acetate			-445.75	± 0.61	kJ/mol	74.0785 ± 0.0025	79-20-9*500
Isoprene			48.79	± 0.69	kJ/mol	68.1170 ± 0.0040	78-79-5*500
Isodiazene anion		380.9	374.0	± 2.1	kJ/mol	30.02991 ± 0.00020	63986-30-10
Hydronium radical		-18.5	-21.6	± 2.1	kJ/mol	19.02322 ± 0.00037	12168-76-2*100
Dihydrogen		1.417	0.019	± 0.000	kJ/mol	2.01588 ± 0.00014	1333-74-0*1
Carbon dioxide anion		-340.6	-340.1	± 2.2	kJ/mol	44.01005 ± 0.00100	14485-07-5*0
2-Hydroxyethenyl		143.9	137.4	± 1.1	kJ/mol	43.0446 ± 0.0016	108665-16-3*11
Isocyanic fluoride		301.3	303.1	± 1.7	kJ/mol	45.01584 ± 0.00080	16992-26-0*0
2-Hydroxyethenyl		147.2	140.9	± 1.3	kJ/mol	43.0446 ± 0.0016	108665-16-3*22
Propionic acid		-505.46	-509.61	± 0.18	kJ/mol	74.0785 ± 0.0025	79-09-4*500
Ethylene glycol		-448.73	-455.25	± 0.37	kJ/mol	62.0678 ± 0.0018	107-21-1*500
2-Hydroxyethenyl		150.6	144.5	± 1.6	kJ/mol	43.0446 ± 0.0016	108665-16-3*12
Ammonia anion		94.3	87.2	± 2.4	kJ/mol	17.03111 ± 0.00022	37353-00-7*0
Oxalic acid		-819.57	-829.66	± 0.42	kJ/mol	90.0349 ± 0.0020	144-62-7*500
Dimethylamine			-43.56	± 0.38	kJ/mol	45.0837 ± 0.0017	124-40-3*500
Hydrogen bromide			-120.26	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*839
Hydrogen difluoride cation		1267.6	1265.4	± 4.1	kJ/mol	39.004198 ± 0.000070	126950-54-71
Trimethylamine			-49.25	± 0.98	kJ/mol	59.1103 ± 0.0025	75-50-3*500
Cyanogen anion		281.5	284.7	± 2.2	kJ/mol	52.0354 ± 0.0016	11118-88-0*0
1,3-Propanediyl		320.0	308.1	± 1.6	kJ/mol	42.0797 ± 0.0024	32458-33-6*1
n-Heptane		-201.72	-224.17	± 0.48	kJ/mol	100.2019 ± 0.0057	142-82-5*500
Diisocyanogen cation		1824.8	1827.5	± 3.3	kJ/mol	52.0343 ± 0.0016	78800-21-21
Isocyanogen chloride		314.5	316.2	± 2.4	kJ/mol	61.4701 ± 0.0012	75754-69-7*0
Cyanoaminyliumyl		1671.6	1672.9	± 2.6	kJ/mol	40.02363 ± 0.00081	316122-03-9*0
Cyanoamidogen anion		210.91	210.84	± 0.77	kJ/mol	40.02473 ± 0.00081	189879-95-6*0
n-Octane		-226.66	-249.78	± 0.67	kJ/mol	114.2285 ± 0.0065	111-65-9*500
1,5-Hexadiene			54.43	± 0.32	kJ/mol	82.1436 ± 0.0049	592-42-7*500
Cyanamide			58.89	± 0.54	kJ/mol	42.04006 ± 0.00082	420-04-2*500
Dioxiranylidene anion		-110.2	-109.7	± 3.0	kJ/mol	44.01005 ± 0.00100	138832-58-30
Diazomethyliumyl		1641.2	1642.4	± 4.1	kJ/mol	40.02363 ± 0.00081	307495-90-5*0
Diazomethylene anion		408.3	408.5	± 3.8	kJ/mol	40.02473 ± 0.00081	205498-92-6*0
3H-Diazirin-3-ylidene		578.8	579.2	± 2.7	kJ/mol	40.02418 ± 0.00081	253308-70-2*0
Dioxygen difluoride		75.1	71.6	± 3.6	kJ/mol	69.99561 ± 0.00060	183051-89-0*0
Trioxidanyl		25.32	23.23	± 0.13	kJ/mol	49.00614 ± 0.00090	12500-78-6*0
Ethynylene		827.55	834.25	± 0.26	kJ/mol	24.0214 ± 0.0016	12070-15-4*1
Chloromethyliumylidene		1282.6	1285.7	± 2.4	kJ/mol	47.4629 ± 0.0012	69773-94-0*0
Chloromethylidyne anion		319.7	323.4	± 2.5	kJ/mol	47.4639 ± 0.0012	117129-77-8*0
Isocyanogen bromide		341.4	335.7	± 3.4	kJ/mol	105.9214 ± 0.0013	65997-98-0*0
Dihydrogen fluoride		-56.5	-54.1	± 1.7	kJ/mol	21.01428 ± 0.00014	12592-22-2*2
1-Propynylium		1547.0	1545.1	± 3.1	kJ/mol	39.0554 ± 0.0024	24858-94-4*0
Bromoniumyl		1098.01	1090.17	± 0.15	kJ/mol	80.9114 ± 0.0010	12258-64-9*0
Tetraoxodinitrogen cation		1030.6	1025.1	± 2.6	kJ/mol	92.0105 ± 0.0012	64476-91-1*0
Trihydrogen		756.931	754.146	± 0.015	kJ/mol	3.02382 ± 0.00021	12184-91-7*2
Cycloprop-1-enylium		1502.2	1497.9	± 2.2	kJ/mol	39.0554 ± 0.0024	117067-78-4*0
Hydrochlorate ion		-25.2	-24.2	± 2.5	kJ/mol	36.46119 ± 0.00090	63099-75-2*0
1,1,1-Trichloroethane			-177.54	± 0.49	kJ/mol	133.4033 ± 0.0031	71-55-6*500
Cycloprop-1-enylide		373.4	369.0	± 2.2	kJ/mol	39.0565 ± 0.0024	80251-77-0*0
Acetonitrile			40.59	± 0.23	kJ/mol	41.0520 ± 0.0016	75-05-8*500
Isocyanogen iodide		341.7	342.0	± 4.9	kJ/mol	152.92191 ± 0.00080	66004-32-8*0
Cycloprop-2-enylide		514.8	511.8	± 2.2	kJ/mol	39.0565 ± 0.0024	20829-57-6*0
Isocyanogen iodide anion		123.0	125.2	± 9.3	kJ/mol	152.92246 ± 0.00080	66004-32-80
Dioxymethylidyne cation		1436.6	1439.0	± 2.7	kJ/mol	44.00895 ± 0.00100	791121-04-52
Vinyl chloride		-2.7	1.9	± 1.9	kJ/mol	62.4979 ± 0.0018	75-01-4*500
Poly(vinylchloride)		-84.6	-94.0	± 1.3	kJ/mol	62.4979 ± 0.0018	9002-86-2*500
1,1-Dichloroethene			-23.80	± 0.50	kJ/mol	96.9427 ± 0.0024	75-35-4*500
Chlorine chlorite		177.4	175.0	± 2.2	kJ/mol	102.9042 ± 0.0019	105206-44-8*2
Perchloryl cation		1252.1	1246.3	± 2.5	kJ/mol	83.4504 ± 0.0013	23594-88-9*0
Dihydrogen cation		1489.060	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*1
Hydrogen fluoride			-321.03	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*887
Dichloromethane			-122.42	± 0.54	kJ/mol	84.9320 ± 0.0020	75-09-2*590
Hydrogen chloride			-166.741	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*842
Methanol dimer		-398.5	-419.2	± 1.4	kJ/mol	64.0837 ± 0.0018	42845-44-3*0
Dioxymethylidyne cation		1388.2	1391.7	± 3.2	kJ/mol	44.00895 ± 0.00100	791121-04-5101
Difluoromethylene anion		-211.17	-209.99	± 0.60	kJ/mol	50.00805 ± 0.00080	66212-40-6*0
Fluoromethylidyne anion		200.8	204.3	± 1.9	kJ/mol	31.00965 ± 0.00080	33412-12-3*0
Cyclopropenylidene anion		544.2	543.8	± 2.2	kJ/mol	38.0485 ± 0.0024	16165-40-50
Tetraoxidanyl		53.0	46.0	± 5.1	kJ/mol	65.0055 ± 0.0012	69696-93-1*2
Difluorovinylidene		129.4	130.7	± 2.2	kJ/mol	62.0182 ± 0.0016	41895-33-4*0
Nitric acid			-186.85	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*801
Fluoroethynylium		1536.2	1540.9	± 2.3	kJ/mol	43.0193 ± 0.0016	268566-69-4*0
Peroxychlorous acid		103.5	97.6	± 2.5	kJ/mol	84.4588 ± 0.0013	177778-92-6*2
Bromoacetylene		282.1	275.6	± 1.6	kJ/mol	104.9333 ± 0.0019	593-61-3*0
Nitric acid			-197.76	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*805
2-Oxo-1-ethylium-1-yl		1289.4	1286.0	± 2.5	kJ/mol	42.0361 ± 0.0016	214464-96-7*11
Oxoethylidene anion		86.9	83.6	± 2.1	kJ/mol	42.0372 ± 0.0016	106543-38-8*1
Chloro(chlorooxy)methylene		98.	101.	± 15.	kJ/mol	98.9155 ± 0.0020	479587-31-0*11
Paraformaldehyde			-179.2	± 1.6	kJ/mol	30.02598 ± 0.00087	30525-89-4*500
Chlorooxomethylium		783.7	783.9	± 2.2	kJ/mol	63.4623 ± 0.0012	38264-03-8*0
Tetrazete		764.9	759.0	± 1.8	kJ/mol	56.02696 ± 0.00028	42851-09-2*0
Oxygen atom hexacation		42035.28	42037.14	± 0.12	kJ/mol	15.99611 ± 0.00030	14158-22-6*0
2-Iodoethanol			-207.2	± 2.4	kJ/mol	171.9650 ± 0.0017	624-76-0*590
Tetraazatetrahedrane		763.7	757.2	± 1.7	kJ/mol	56.02696 ± 0.00028	12596-63-3*0
1,3-Butadiyne cation		1439.72	1441.58	± 0.80	kJ/mol	50.0581 ± 0.0032	55468-55-8*0
Hydrogen difluoride cation		1241.	1238.	± 17.	kJ/mol	39.004198 ± 0.000070	126950-54-7*1
Carbon suboxide cation		928.3	931.8	± 1.3	kJ/mol	68.0304 ± 0.0025	151528-67-5*0
Carbon suboxide anion		-131.4	-128.0	± 2.5	kJ/mol	68.0314 ± 0.0025	109362-94-9*0
Benzene anion		209.1	197.2	± 1.2	kJ/mol	78.1124 ± 0.0048	34562-85-1*0
Nitric acid trihydrate		-1062.10	-1055.25	± 0.21	kJ/mol	117.0587 ± 0.0019	13444-83-2*500
o-Benzyne		625.5	616.2	± 1.1	kJ/mol	76.0960 ± 0.0048	462-80-6*1
Nitric acid monohydrate		-479.18	-472.68	± 0.19	kJ/mol	81.0282 ± 0.0012	13444-82-1*500
Dioxiranylidene cation		1409.1	1410.3	± 2.6	kJ/mol	44.00895 ± 0.00100	138832-57-20
2-Propen-3-ylium-1-ylidyne		1791.1	1792.7	± 2.6	kJ/mol	38.0474 ± 0.0024	161054-36-0*0
Ethyl hydroperoxide			-205.	± 21.	kJ/mol	62.0678 ± 0.0018	3031-74-1*500
m-Benzyne		526.9	518.4	± 1.2	kJ/mol	76.0960 ± 0.0048	1828-89-3*0
Propenediylidene anion		588.8	590.0	± 2.3	kJ/mol	38.0485 ± 0.0024	161054-36-00
p-Benzyne cation		1424.8	1417.6	± 2.1	kJ/mol	76.0954 ± 0.0048	121058-09-1*0
p-Benzyne		586.9	577.5	± 1.2	kJ/mol	76.0960 ± 0.0048	3355-34-8*0
Toluene		19.72	11.97	± 0.34	kJ/mol	92.1384 ± 0.0056	108-88-3*500
Cyclopentadienylium		1087.60	1074.73	± 0.92	kJ/mol	65.0927 ± 0.0040	29661-18-5*0
Triiodine		153.4	149.4	± 3.6	kJ/mol	380.713410 ± 0.000090	12596-31-5*0
Hydraziniumyl		886.6	873.2	± 2.0	kJ/mol	32.04469 ± 0.00031	20771-51-1*0
Cycloheptene		-25.5	-46.6	± 1.7	kJ/mol	96.1702 ± 0.0057	628-92-2*500
Hydroxylamine			-97.1	± 2.2	kJ/mol	33.02996 ± 0.00037	7803-49-8*1000
Cycloheptatriene		153.74	144.95	± 0.97	kJ/mol	92.1384 ± 0.0056	544-25-2*500
1-Propenylium		1231.9	1221.6	± 1.7	kJ/mol	41.0713 ± 0.0024	50457-58-4*2
Nitrosyl nitrite anion		-103.1	-106.2	± 2.8	kJ/mol	76.01223 ± 0.00091	122413-35-81
Phenylethene			104.30	± 0.48	kJ/mol	104.1491 ± 0.0064	100-42-5*500
Hydrazine		57.25	50.68	± 0.18	kJ/mol	32.04524 ± 0.00031	302-01-2*500
Phenol		-146.55	-162.39	± 0.65	kJ/mol	94.1112 ± 0.0048	108-95-2*500
Formic acid		-431.56	-424.72	± 0.20	kJ/mol	46.0254 ± 0.0010	64-18-6*500
1-Propenylide		204.1	192.8	± 1.8	kJ/mol	41.0723 ± 0.0024	65887-20-9*2
Anisole			-119.58	± 0.77	kJ/mol	108.1378 ± 0.0056	100-66-3*500
Peroxynitrous acid		-5.81	-11.64	± 0.36	kJ/mol	63.01288 ± 0.00091	14691-52-2*0
Benzaldehyde		-85.8	-86.8	± 1.1	kJ/mol	106.1219 ± 0.0056	100-52-7*500
(Z)-Diazene anion	$[H]/N=[N-]\[H]$	280.0	273.3	± 2.0	kJ/mol	30.02991 ± 0.00020	86631-37-00
Fluorobenzene anion		-18.3	-30.2	± 1.8	kJ/mol	96.1029 ± 0.0048	34561-55-2*0
m-Chlorophenylium		1159.9	1149.8	± 2.6	kJ/mol	111.5481 ± 0.0049	127983-85-1*0
p-Chlorophenylium		1147.2	1137.7	± 2.5	kJ/mol	111.5481 ± 0.0049	42766-43-8*0
o-Chlorophenylium		1166.5	1157.2	± 2.5	kJ/mol	111.5481 ± 0.0049	137963-70-3*0
Hydroxyoxoammoniumyl		984.1	977.7	± 1.8	kJ/mol	47.01293 ± 0.00061	80371-48-8*1
Iodobenzene cation		1022.69	1007.25	± 0.99	kJ/mol	204.0078 ± 0.0048	38406-85-8*0
1-Ethenylium-1-yl		1507.0	1507.1	± 2.1	kJ/mol	26.0367 ± 0.0016	80541-07-7*0
Carbon dioxide cation		1335.0	1335.5	± 2.4	kJ/mol	44.00895 ± 0.00100	12181-61-2*1
Nitrobenzene			6.4	± 1.4	kJ/mol	123.1094 ± 0.0049	98-95-3*500
Nitromethane		-114.17	-112.98	± 0.43	kJ/mol	61.0401 ± 0.0010	75-52-5*500
Peroxyhypochlorous acid cation		1030.3	1024.5	± 2.5	kJ/mol	68.4589 ± 0.0011	67952-07-21
Hydrogen fluoride			-321.47	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*832
2,2,4-Trimethylpentane		-224.5	-258.9	± 1.5	kJ/mol	114.2285 ± 0.0065	540-84-1*500
Formyloxidanyl		-125.91	-127.27	± 0.56	kJ/mol	45.0174 ± 0.0010	16499-21-1*0
Norbornadiene			208.6	± 1.2	kJ/mol	92.1384 ± 0.0056	121-46-0*500
2,3-Butanedione			-365.66	± 0.53	kJ/mol	86.0892 ± 0.0033	431-03-8*500
Succinic acid		-802.9	-825.1	± 3.0	kJ/mol	118.0880 ± 0.0034	110-15-6*0
Dioxiranyl		217.3	213.8	± 2.0	kJ/mol	45.0174 ± 0.0010	120595-16-6*0
NON anion		495.3	492.8	± 2.5	kJ/mol	44.01343 ± 0.00033	227934-47-60
1,2-Diiodoethane		87.79	73.13	± 0.90	kJ/mol	281.8621 ± 0.0016	624-73-7*0
1,2-Diiodoethane			9.26	± 0.60	kJ/mol	281.8621 ± 0.0016	624-73-7*500
Helium hydride cation		1350.148	1348.258	± 0.000	kJ/mol	5.009993 ± 0.000070	17009-49-3*0
Xenon hydride cation		1038.03	1036.26	± 0.89	kJ/mol	132.2974 ± 0.0200	37276-91-8*0
2-Butanone		-267.90	-273.39	± 0.79	kJ/mol	72.1057 ± 0.0033	78-93-3*500
2,4,5-Trioxa-1,3-diazabicyclo[1.1.1]pentane		602.5	593.3	± 2.1	kJ/mol	76.01168 ± 0.00091	224950-18-9*0
Cyclopropylium		1104.5	1093.0	± 2.5	kJ/mol	41.0713 ± 0.0024	1724-43-2*0
Hydrazoic acid cation		1333.66	1327.99	± 0.83	kJ/mol	43.02761 ± 0.00022	58852-14-5*0
Acrolein			-95.8	± 1.4	kJ/mol	56.0633 ± 0.0024	107-02-8*500
Hydrazoic acid anion		309.0	302.7	± 2.3	kJ/mol	43.02871 ± 0.00022	203264-98-6*1
Ethenedione anion		-148.4	-145.8	± 2.4	kJ/mol	56.0207 ± 0.0017	77783-15-4*0
Hydrogen chloride			-166.105	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*830
Urea		-317.79	-333.38	± 0.12	kJ/mol	60.05534 ± 0.00091	57-13-6*500
Formamide			-251.01	± 0.29	kJ/mol	45.04066 ± 0.00088	75-12-7*500
Peroxyhypochlorous acid anion		-32.2	-34.0	± 2.6	kJ/mol	68.4600 ± 0.0011	67952-08-32
Acetamide			-315.78	± 0.56	kJ/mol	59.0672 ± 0.0017	60-35-5*500
Ethoxyethane		-265.43	-277.74	± 0.82	kJ/mol	74.1216 ± 0.0033	60-29-7*500
Trioxidane		-82.01	-90.61	± 0.63	kJ/mol	50.01408 ± 0.00091	14699-99-1*0
Acrylonitrile		446.3	440.9	± 1.8	kJ/mol	53.0627 ± 0.0024	107-13-1*2
Acrylonitrile		146.26	153.92	± 0.78	kJ/mol	53.0627 ± 0.0024	107-13-1*500
Isocyanoethene		544.0	539.1	± 1.8	kJ/mol	53.0627 ± 0.0024	14668-82-7*2
Cyclobutane			3.90	± 0.40	kJ/mol	56.1063 ± 0.0032	287-23-0*590
Bromosyl bromide		179.0	163.2	± 2.1	kJ/mol	175.8074 ± 0.0020	68322-97-4*0
1-Isocyanoethylidene		527.7	523.0	± 1.1	kJ/mol	53.0627 ± 0.0024	498544-34-60
Nitrous acid anion		-105.85	-110.48	± 0.78	kJ/mol	47.01403 ± 0.00061	256393-36-9*2
Methylcyclopropane			1.83	± 0.59	kJ/mol	56.1063 ± 0.0032	594-11-6*590
Carbon monoxide anion		30.0	33.7	± 2.3	kJ/mol	28.01065 ± 0.00085	12539-63-8*0
Methylamine			-45.36	± 0.46	kJ/mol	31.05714 ± 0.00088	74-89-5*500
Trioxirane		272.7	270.1	± 1.3	kJ/mol	47.99820 ± 0.00090	153851-84-4*0
Deuterium hydride		0.328	0.319	± 0.000	kJ/mol	3.022042 ± 0.000070	13983-20-5*0
1-Methyl-1-ethylium-1-yl		1058.1	1045.6	± 1.9	kJ/mol	42.0792 ± 0.0024	121408-19-3*0
Iodine monochloride		-36.511	-35.537	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*510
Carbon monoxide		465.579	469.286	± 0.026	kJ/mol	28.01010 ± 0.00085	630-08-0*1
Chlorodioxidenium		1202.7	1200.4	± 3.4	kJ/mol	67.4510 ± 0.0011	64710-10-7*0
Oxygen difluoride cation		1292.12	1289.59	± 0.66	kJ/mol	53.99566 ± 0.00030	39432-25-2*0
Azide			272.63	± 0.48	kJ/mol	42.02077 ± 0.00021	14343-69-2*800
Propane cation		974.6	954.7	± 1.7	kJ/mol	44.0951 ± 0.0025	34479-70-4*0
Tetraoxygen		104.4	102.4	± 3.5	kJ/mol	63.9976 ± 0.0012	12596-83-7*11
Hydrogen peroxide		-193.171	-187.354	± 0.079	kJ/mol	34.01468 ± 0.00062	7722-84-1*500
Cyclobutenylium		1036.9	1023.8	± 3.4	kJ/mol	53.0820 ± 0.0032	12316-90-4*0
Difluorodioxidanium		1283.6	1279.1	± 2.3	kJ/mol	69.99506 ± 0.00060	7783-44-01
Butyraldehyde		-235.99	-239.51	± 0.84	kJ/mol	72.1057 ± 0.0033	123-72-8*500
Oxadiazirine cation		1509.9	1507.2	± 2.4	kJ/mol	44.01233 ± 0.00033	227934-45-40
Oxygen difluoride anion		-202.0	-201.9	± 2.7	kJ/mol	53.99675 ± 0.00030	7783-41-70
Chlorine hydride oxide		165.1	155.3	± 2.5	kJ/mol	84.4588 ± 0.0013	1027055-52-2*0
Silicon carbide		735.6	740.6	± 2.5	kJ/mol	40.09620 ± 0.00085	409-21-2*0
Silicon carbide		-72.3	-73.3	± 1.5	kJ/mol	40.09620 ± 0.00085	409-21-2*502
Quartz		-906.11	-911.09	± 0.94	kJ/mol	60.08430 ± 0.00067	14808-60-7*500
Quartz		-825.67	-901.59	± 0.95	kJ/mol	60.08430 ± 0.00067	14808-60-7*520
Hydrogen chloride			-166.565	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*839
Quartz		-903.41	-908.27	± 0.98	kJ/mol	60.08430 ± 0.00067	14808-60-7*510
Nitrosyl nitrate		60.4	52.5	± 1.9	kJ/mol	92.0111 ± 0.0012	15969-55-8*2
Methylene		391.060	391.617	± 0.097	kJ/mol	14.02658 ± 0.00081	2465-56-7*0
Tetrabromomethane			49.3	± 1.4	kJ/mol	331.6267 ± 0.0041	558-13-4*500
Propionic acid		-436.41	-454.30	± 0.60	kJ/mol	74.0785 ± 0.0025	79-09-4*0
Tetraiodomethane			392.5	± 8.0	kJ/mol	519.62858 ± 0.00081	507-25-5*500
1-Hydroxyethyl		-42.76	-56.19	± 0.58	kJ/mol	45.0605 ± 0.0017	2348-46-1*0
Bromomethane		-55.99	-59.01	± 0.27	kJ/mol	94.9385 ± 0.0013	74-83-9*590
Acetic acid			-484.89	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*833
Tetroxidane		-34.1	-44.6	± 2.3	kJ/mol	66.0135 ± 0.0012	29683-94-1*0
Water		-238.932	-241.835	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*2
1-Methylethenylium		995.2	986.0	± 2.0	kJ/mol	41.0713 ± 0.0024	50457-57-3*0
Tetraoxodinitrate anion		-184.6	-187.8	± 2.4	kJ/mol	92.0116 ± 0.0012	63552-02-3*0
Trihydrogen		215.9	218.3	± 1.1	kJ/mol	3.02382 ± 0.00021	12184-91-7*100
Acetic acid			-484.94	± 0.23	kJ/mol	60.0520 ± 0.0017	64-19-7*850
Oxygen atom octacation		197447.75	197449.60	± 0.12	kJ/mol	15.99501 ± 0.00030	21450-98-6*0
Dinitrogen dimer		-0.88	0.84	± 0.67	kJ/mol	56.02696 ± 0.00028	154680-01-0*0
Ammonium hydroxide			-366.716	± 0.062	kJ/mol	35.04584 ± 0.00047	1336-21-6*1000
Cyclopropane cation		1022.3	1006.8	± 1.6	kJ/mol	42.0792 ± 0.0024	34496-93-0*0
1-Propen-1-yl-3-ylidene		656.6	653.2	± 1.1	kJ/mol	39.0559 ± 0.0024	84654-90-0*1
Trioxirane cation		1444.5	1442.3	± 2.2	kJ/mol	47.99765 ± 0.00090	153851-84-40
mu-Oxodichlorine cation		1130.44	1126.83	± 0.63	kJ/mol	86.9043 ± 0.0018	51174-96-0*0
Ethyl bromide		-55.56	-91.09	± 0.26	kJ/mol	108.9651 ± 0.0019	74-96-4*500
Dihydrogen anion		253.8	254.7	± 1.2	kJ/mol	2.01643 ± 0.00014	12184-89-3*0
Vinyl iodide		139.5	130.7	± 1.2	kJ/mol	153.9497 ± 0.0016	593-66-8*0
Hydrogen peroxide		-129.479	-135.465	± 0.063	kJ/mol	34.01468 ± 0.00062	7722-84-1*2
iso-Hexane		-180.35	-204.01	± 0.83	kJ/mol	86.1754 ± 0.0049	107-83-5*500
Chlorine trifluoride cation		1053.4	1049.1	± 2.5	kJ/mol	92.44736 ± 0.00090	478167-77-0*0
Difluorovinylidene cation		1181.6	1183.0	± 2.3	kJ/mol	62.0177 ± 0.0016	268566-71-8*0
1-Methylethenyl anion		199.4	188.2	± 2.0	kJ/mol	41.0723 ± 0.0024	65887-19-6*0
Methyl acetate		-394.29	-413.16	± 0.61	kJ/mol	74.0785 ± 0.0025	79-20-9*0
Oxygen atom heptacation		113369.48	113371.34	± 0.12	kJ/mol	15.99556 ± 0.00030	14274-89-6*0
2-Oxo-1-ethylium-1-yl		1292.0	1288.6	± 2.4	kJ/mol	42.0361 ± 0.0016	214464-96-7*12
Peroxyformate		-320.8	-326.7	± 1.8	kJ/mol	61.0174 ± 0.0012	104960-05-6*2
Hypochloroperoxoous acid, hydroxy ester		49.5	42.5	± 2.5	kJ/mol	84.4588 ± 0.0013	928652-99-7*2
Oxoethylidene anion		92.2	89.0	± 2.3	kJ/mol	42.0372 ± 0.0016	106543-38-8*2
Polyoxymethylene			-170.88	± 0.21	kJ/mol	30.02598 ± 0.00087	9002-81-7*500
Peroxyformyl		-90.6	-96.0	± 1.8	kJ/mol	61.0168 ± 0.0012	56240-83-6*2
1,2-Propadien-1-ylium-1-yl-3-ylidene		1944.7	1952.6	± 1.9	kJ/mol	36.0316 ± 0.0024	118090-85-0*0
Nitrogen atom		470.579	472.442	± 0.024	kJ/mol	14.006740 ± 0.000070	17778-88-0*1
Chloro(chlorooxy)methylene		101.1	104.7	± 4.8	kJ/mol	98.9155 ± 0.0020	479587-31-0*12
Oxygen atom trication		10249.929	10252.880	± 0.018	kJ/mol	15.99775 ± 0.00030	14127-64-1*0
Dihydrogen cation		1488.364	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*2
Carbon suboxide		-131.7	-116.6	± 1.3	kJ/mol	68.0309 ± 0.0025	504-64-3*500
Formaldehyde			-171.19	± 0.59	kJ/mol	30.02598 ± 0.00087	50-00-0*800
Trioxygen difluoride		112.2	107.1	± 1.1	kJ/mol	85.99501 ± 0.00090	16829-28-0*0
Isocyanogen cation		1653.1	1655.4	± 1.6	kJ/mol	52.0343 ± 0.0016	133415-63-1*0
m-Benzyne		614.5	605.1	± 1.4	kJ/mol	76.0960 ± 0.0048	1828-89-3*1
Diisocyanogen cation		1838.1	1842.0	± 3.1	kJ/mol	52.0343 ± 0.0016	78800-21-22
Oxonium		605.85	599.10	± 0.17	kJ/mol	19.02267 ± 0.00037	13968-08-6*2
Iodine monochloride			-24.048	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*590
Tropylide		260.9	244.6	± 2.0	kJ/mol	91.1310 ± 0.0056	34464-18-1*0
Difluorine cation		1514.301	1514.475	± 0.013	kJ/mol	37.9962578 ± 0.0000010	12184-86-0*0
Dihydrogen		-0.000	-0.058	± 0.000	kJ/mol	2.01588 ± 0.00014	1333-74-0*2
Fluorine atom		77.262	79.047	± 0.048	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*1
Propylene cation		975.18	961.65	± 0.20	kJ/mol	42.0792 ± 0.0024	34504-10-4*0
Deuteride		146.991	148.904	± 0.0021	kJ/mol	2.01465035791 ± 0.00000000040	14452-69-8*0
Methyl formate		-346.88	-359.92	± 0.84	kJ/mol	60.0520 ± 0.0017	107-31-3*0
Iodine		198.109	197.709	± 0.0021	kJ/mol	126.904470 ± 0.000030	14362-44-8*2
Hydrazine monohydrate			-242.66	± 0.19	kJ/mol	50.06052 ± 0.00053	7803-57-8*500
Hydrogen peroxide cation		897.23	890.25	± 0.51	kJ/mol	34.01413 ± 0.00062	12325-10-9*11
Acetylene anion		356.8	356.7	± 1.9	kJ/mol	26.0378 ± 0.0016	50443-89-5*0
Difluorodioxidanium		1287.2	1283.0	± 2.3	kJ/mol	69.99506 ± 0.00060	7783-44-02
1-Propenylium		1233.8	1223.4	± 2.0	kJ/mol	41.0713 ± 0.0024	50457-58-4*1
Ethyl formate		-375.2	-393.9	± 1.2	kJ/mol	74.0785 ± 0.0025	109-94-4*0
1,3-Butadiyn-4-ylium-1-yl		2109.9	2120.5	± 2.9	kJ/mol	48.0423 ± 0.0032	124708-46-9*0
Acetylene		599.0	598.9	± 1.5	kJ/mol	26.0373 ± 0.0016	74-86-2*11
Trihydrogen cation		1110.304	1106.697	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*2
1,3-Butadiynyl anion		677.7	686.8	± 1.2	kJ/mol	48.0433 ± 0.0032	59158-53-1*0
1-Propenylide		210.5	199.4	± 2.1	kJ/mol	41.0723 ± 0.0024	65887-20-9*1
Oxoniumyl ion		978.467	975.563	± 0.028	kJ/mol	18.01473 ± 0.00033	56583-62-1*1
Bromodioxy		118.2	109.1	± 4.3	kJ/mol	111.9028 ± 0.0012	67177-47-3*0
2-Hydroxyethylium		1024.5	1011.9	± 2.0	kJ/mol	45.0600 ± 0.0017	38607-31-7*1
Hydroxyoxoammoniumyl		1014.8	1008.4	± 2.0	kJ/mol	47.01293 ± 0.00061	80371-48-8*2
sec-Butylium		792.9	769.3	± 1.7	kJ/mol	57.1137 ± 0.0033	16548-59-7*0
Hydrogen fluoride			-321.15	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*906
Trioxodinitrate anion		-87.3	-93.1	± 2.2	kJ/mol	76.01223 ± 0.00091	194856-62-7*1
Chlorine atom		119.621	121.228	± 0.0011	kJ/mol	35.45270 ± 0.00090	22537-15-1*1
Tribromine cation		1035.9	1013.2	± 2.6	kJ/mol	239.7115 ± 0.0030	33105-86-1*0
Hydroxymethylene		112.67	108.91	± 0.27	kJ/mol	30.02598 ± 0.00087	19710-56-6*0
Succinic acid		-918.55	-940.28	± 0.13	kJ/mol	118.0880 ± 0.0034	110-15-6*500
Hydroxylamine		-33.12	-43.49	± 0.45	kJ/mol	33.02996 ± 0.00037	7803-49-8*0
1,2-Dibromoethane			-80.2	± 1.2	kJ/mol	187.8612 ± 0.0026	106-93-4*500
1,3-Butadien-2-ol		-43.2	-59.7	± 2.3	kJ/mol	70.0898 ± 0.0032	59120-04-6*21
1,3-Butadien-2-ol		-53.9	-69.1	± 1.6	kJ/mol	70.0898 ± 0.0032	59120-04-6*1
Deuterium molecule cation		1492.286	1492.361	± 0.000	kJ/mol	4.02765497609 ± 0.00000000080	12184-84-8*0
Acrolein		-55.3	-65.4	± 1.2	kJ/mol	56.0633 ± 0.0024	107-02-8*0
1,2-Propadien-1-one cation		1012.6	1011.2	± 1.9	kJ/mol	54.0468 ± 0.0024	87612-93-9*0
Nitrosyl nitrite anion		-100.3	-103.5	± 2.9	kJ/mol	76.01223 ± 0.00091	122413-35-82
2-Propynal cation		1168.3	1167.2	± 1.6	kJ/mol	54.0468 ± 0.0024	100815-70-1*0
mu-Oxodichlorate anion		-147.8	-147.7	± 2.5	kJ/mol	86.9053 ± 0.0018	365546-30-1*0
Acetoxy		-182.8	-191.6	± 1.2	kJ/mol	59.0440 ± 0.0017	13799-69-4*1
Isocyanogen bromide anion		105.3	102.1	± 4.6	kJ/mol	105.9220 ± 0.0013	238754-53-50
Peroxyhypochlorous acid cation		1050.8	1045.1	± 2.5	kJ/mol	68.4589 ± 0.0011	67952-07-22
Diatomic bromine cation		1060.32	1045.37	± 0.23	kJ/mol	159.8075 ± 0.0020	12595-71-0*0
Hydrogen peroxide cation		930.98	924.12	± 0.98	kJ/mol	34.01413 ± 0.00062	12325-10-9*22
Nitrous acid anion		-105.5	-109.4	± 1.8	kJ/mol	47.01403 ± 0.00061	256393-36-9*1
Bicyclo[1.1.0]buta-1,3-dien-4-ylium-2-yl		2087.4	2097.2	± 2.7	kJ/mol	48.0423 ± 0.0032	289679-91-0*0
Tribromide			-129.23	± 0.26	kJ/mol	239.7125 ± 0.0030	14522-80-6*800
2-Chloro ozone		265.9	265.3	± 3.7	kJ/mol	83.4509 ± 0.0013	141801-66-30
Cyanoacetylene cation		1495.33	1497.63	± 0.64	kJ/mol	51.0462 ± 0.0024	85398-68-1*0
Isocyanoacetylene cation		1567.5	1570.1	± 1.3	kJ/mol	51.0462 ± 0.0024	145076-03-5*0
Hydrazoic acid anion		316.2	310.0	± 2.3	kJ/mol	43.02871 ± 0.00022	203264-98-6*2
Cyanoethynylium		1867.6	1874.3	± 3.2	kJ/mol	50.0383 ± 0.0024	104233-69-4*0
Water		-286.302	-292.742	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*510
Hydrazoic acid			257.64	± 0.48	kJ/mol	43.02816 ± 0.00022	7782-79-8*1000
Acetoxy		-182.8	-191.5	± 1.2	kJ/mol	59.0440 ± 0.0017	13799-69-4*0
Hydrazoic acid			272.63	± 0.48	kJ/mol	43.02816 ± 0.00022	7782-79-8*800
Bicyclo[1.1.0]buta-1,3-dien-2-yl anion		803.7	811.3	± 2.1	kJ/mol	48.0433 ± 0.0032	289679-89-6*0
3-Imino-2-propen-1-ylidene		530.6	526.3	± 1.2	kJ/mol	53.0627 ± 0.0024	916765-05-4*1
2-(Methylidyneamino)ethenyl		600.6	596.3	± 1.2	kJ/mol	53.0627 ± 0.0024	123416-74-0*1
Oxygen atom dication		4949.459	4953.000	± 0.013	kJ/mol	15.99830 ± 0.00030	14127-63-0*0
Oxygen atom tetracation		17719.207	17721.064	± 0.025	kJ/mol	15.99721 ± 0.00030	14127-65-2*0
Water trimer		-762.73	-776.83	± 0.21	kJ/mol	54.04584 ± 0.00099	31014-12-7*0
Peroxyhypochlorous acid anion		-2.9	-3.3	± 2.6	kJ/mol	68.4600 ± 0.0011	67952-08-31
Carbon monoxide		-113.803	-110.523	± 0.026	kJ/mol	28.01010 ± 0.00085	630-08-0*2
Hydrogen iodide			-56.824	± 0.090	kJ/mol	127.912410 ± 0.000076	10034-85-2*800
Dioxaziridine		277.5	270.8	± 1.9	kJ/mol	47.01348 ± 0.00061	67394-35-8*0
Tetraoxygen		69.8	65.1	± 4.4	kJ/mol	63.9976 ± 0.0012	12596-83-7*21
Hydroxylamine			-107.51	± 0.62	kJ/mol	33.02996 ± 0.00037	7803-49-8*500
Tetraoxygen		399.0	393.2	± 3.9	kJ/mol	63.9976 ± 0.0012	12596-83-7*23
Tetraoxygen		465.6	459.6	± 4.2	kJ/mol	63.9976 ± 0.0012	12596-83-7*24
Dioxofluorine cation		1667.0	1664.8	± 2.8	kJ/mol	50.99665 ± 0.00060	223566-05-0*0
Methylaminyliumyl		1388.3	1381.9	± 2.3	kJ/mol	29.04071 ± 0.00083	56924-51-7*1
Acetaldehyde		-187.06	-191.78	± 0.31	kJ/mol	44.0526 ± 0.0017	75-07-0*500
Ethynylene		820.33	826.90	± 0.26	kJ/mol	24.0214 ± 0.0016	12070-15-4*2
Oxygen atom pentacation		28708.788	28710.646	± 0.053	kJ/mol	15.99666 ± 0.00030	14127-66-3*0
Formylimidogen		245.3	242.1	± 3.3	kJ/mol	43.02478 ± 0.00086	42288-92-6*2
Disilicon		581.4	585.3	± 1.6	kJ/mol	56.17100 ± 0.00060	12597-35-2*0
Cyclopentadiene			109.89	± 0.57	kJ/mol	66.1011 ± 0.0040	542-92-7*590
Fluorosyl fluoride		227.	225.	± 21.	kJ/mol	53.99621 ± 0.00030	86825-57-2*2
Trihydrogen		745.878	743.094	± 0.062	kJ/mol	3.02382 ± 0.00021	12184-91-7*1
Dioxofluorine anion		155.9	154.3	± 2.5	kJ/mol	50.99775 ± 0.00060	175861-93-50
2-Propen-1-ylium-1-ylidene		1373.1	1369.5	± 2.0	kJ/mol	39.0554 ± 0.0024	88000-25-3*0
Quartz		-320.4	-321.7	± 2.4	kJ/mol	60.08430 ± 0.00067	14808-60-7*0
Formylimidogen		245.2	242.1	± 4.6	kJ/mol	43.02478 ± 0.00086	42288-92-6*1
Dinitrogen anion		192.5	192.5	± 1.7	kJ/mol	28.01403 ± 0.00014	12185-02-3*0
Peroxyformyl		-100.58	-105.69	± 0.92	kJ/mol	61.0168 ± 0.0012	56240-83-6*0
Methanediol		-379.41	-392.81	± 0.92	kJ/mol	48.0413 ± 0.0010	463-57-0*0
2-Hydroxyethyl		-13.35	-26.62	± 0.56	kJ/mol	45.0605 ± 0.0017	4422-54-2*0
Peroxyformate		-341.14	-346.59	± 0.95	kJ/mol	61.0174 ± 0.0012	104960-05-6*0
Diiodine cation		963.523	960.408	± 0.018	kJ/mol	253.808391 ± 0.000060	28712-14-3*0
Isocyanomethane			146.1	± 2.2	kJ/mol	41.0520 ± 0.0016	593-75-9*500
Trihydrogen		477.4	474.7	± 2.3	kJ/mol	3.02382 ± 0.00021	12184-91-7*201
Cyanogen		273.93	289.18	± 0.42	kJ/mol	52.0349 ± 0.0016	460-19-5*500
Methane anion		27.3	19.4	± 5.1	kJ/mol	16.04301 ± 0.00085	27680-53-1*0
Fluorosyl fluoride cation		1413.0	1413.4	± 3.5	kJ/mol	53.99566 ± 0.00030	86825-50-50
Cyclopropylidene		474.89	466.87	± 0.85	kJ/mol	40.0639 ± 0.0024	2143-70-6*0
Fluoromethane cation		981.81	974.31	± 0.62	kJ/mol	34.03237 ± 0.00083	59122-96-2*0
Isocyanogen anion		385.5	387.6	± 3.4	kJ/mol	52.0354 ± 0.0016	83951-85-30
O--HH Complex		247.2	248.2	± 2.0	kJ/mol	18.01528 ± 0.00033	7732-18-5102
Ethynol cation		1063.8	1061.2	± 2.9	kJ/mol	42.0361 ± 0.0016	84005-02-7*0
Oxonium		605.91	599.10	± 0.17	kJ/mol	19.02267 ± 0.00037	13968-08-6*1
Diazene anion		265.5	258.7	± 2.0	kJ/mol	30.02991 ± 0.00020	100429-75-2*0
Ethynol anion		163.5	165.0	± 3.3	kJ/mol	42.0372 ± 0.0016	864971-50-6*0
Diisocyanogen anion		456.3	461.9	± 3.7	kJ/mol	52.0354 ± 0.0016	78800-22-30
Water		-286.303	-285.831	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*499
Diisocyanogen cation		1824.8	1827.9	± 3.3	kJ/mol	52.0343 ± 0.0016	78800-21-20
Diazene		207.09	199.95	± 0.41	kJ/mol	30.02936 ± 0.00020	3618-05-1*1
Iminomethyl anion		237.3	233.6	± 1.8	kJ/mol	28.03387 ± 0.00082	90623-30-6*0
Trioxidaniumyl		925.5	916.6	± 1.5	kJ/mol	50.01353 ± 0.00091	161321-37-5*0
Ethynol		95.29	92.81	± 0.80	kJ/mol	42.0367 ± 0.0016	32038-79-2*0
Peroxychlorous acid		96.2	90.6	± 2.1	kJ/mol	84.4588 ± 0.0013	177778-92-6*0
2-Cyclopropyn-1-ylidene		898.9	905.8	± 1.6	kJ/mol	36.0321 ± 0.0024	102508-15-6*0
Diazoethenylidene cation		1771.2	1773.2	± 3.5	kJ/mol	52.0343 ± 0.0016	130760-10-00
Cyclopentadienide		100.1	87.1	± 1.1	kJ/mol	65.0937 ± 0.0040	12127-83-2*0
Diazoethenylidene anion		529.7	532.3	± 3.5	kJ/mol	52.0354 ± 0.0016	130760-11-10
Cyanomethylium		1256.77	1254.13	± 0.74	kJ/mol	40.0435 ± 0.0016	34430-18-7*0
3H-diazirin-3-ylidene-methylene		837.3	839.9	± 2.3	kJ/mol	52.0349 ± 0.0016	204253-88-3*0
1-Methoxyethenol		-284.9	-303.4	± 1.7	kJ/mol	74.0785 ± 0.0025	4453-91-2*0
trans-Cycloheptene		141.6	103.5	± 1.9	kJ/mol	96.1702 ± 0.0057	45509-99-7*0
Propylidene anion		300.8	286.6	± 3.2	kJ/mol	42.0803 ± 0.0024	121408-55-70
Hydrazine anion		232.2	217.8	± 4.1	kJ/mol	32.04579 ± 0.00031	65391-88-0*0
Oxiranylium		901.1	893.2	± 1.5	kJ/mol	43.0441 ± 0.0016	57789-76-1*0
Diazene anion		265.5	258.7	± 2.0	kJ/mol	30.02991 ± 0.00020	100429-75-2*1
Isocyanogen chloride cation		1480.8	1482.1	± 3.9	kJ/mol	61.4696 ± 0.0012	956475-91-5*0
Ethynol		406.4	403.2	± 3.2	kJ/mol	42.0367 ± 0.0016	32038-79-2*12
Oxiranyl anion		121.2	113.3	± 1.5	kJ/mol	43.0452 ± 0.0016	72722-59-9*0
Difluorodioxidane anion		-251.	-251.	± 28.	kJ/mol	69.99615 ± 0.00060	7783-45-10
Ethynol		409.4	406.3	± 3.2	kJ/mol	42.0367 ± 0.0016	32038-79-2*13
Nitrogen atom		700.555	702.458	± 0.024	kJ/mol	14.006740 ± 0.000070	17778-88-0*2
Water		-286.303	-292.744	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*509
Formic acid cation		721.87	715.34	± 0.26	kJ/mol	46.0248 ± 0.0010	50614-05-6*0
Phenol cation		746.05	727.25	± 0.64	kJ/mol	94.1107 ± 0.0048	40932-22-7*0
Phenol anion		22.7	7.7	± 4.9	kJ/mol	94.1118 ± 0.0048	38752-11-3*0
Ethynol		455.5	452.2	± 3.2	kJ/mol	42.0367 ± 0.0016	32038-79-2*14
Formic acid anion		-256.2	-262.3	± 1.8	kJ/mol	46.0259 ± 0.0010	19066-82-1*0
Nitrogen atom anion		487.6	489.9	± 2.5	kJ/mol	14.007289 ± 0.000070	17778-87-9*0
Fluoromethane			-245.75	± 0.45	kJ/mol	34.03292 ± 0.00083	593-53-3*590
Cyanic fluoride cation		1294.4	1294.9	± 1.1	kJ/mol	45.01529 ± 0.00080	62532-69-8*0
Nitrato		1290.61	1285.90	± 0.86	kJ/mol	62.00439 ± 0.00090	133057-96-2*0
Benzaldehyde cation		896.8	880.1	± 1.9	kJ/mol	106.1214 ± 0.0056	80226-59-1*0
Benzaldehyde anion		-60.2	-77.8	± 1.2	kJ/mol	106.1225 ± 0.0056	34473-57-9*0
1-Propen-1-yl-3-ylidene		656.6	653.2	± 1.1	kJ/mol	39.0559 ± 0.0024	84654-90-0*0
2-Propenylidene		417.4	410.5	± 1.5	kJ/mol	40.0639 ± 0.0024	19527-08-3*1
Ethynol		464.1	460.9	± 3.2	kJ/mol	42.0367 ± 0.0016	32038-79-2*15
C=O-C cation		1585.8	1592.9	± 2.7	kJ/mol	40.0203 ± 0.0016	83483-98-1*0
Hydrogen peroxide			-190.76	± 0.30	kJ/mol	34.01468 ± 0.00062	7722-84-1*800
Bromine atom		162.001	155.939	± 0.056	kJ/mol	79.90400 ± 0.00100	10097-32-2*2
Nitrosyl nitrate		48.3	40.4	± 1.8	kJ/mol	92.0111 ± 0.0012	15969-55-8*0
Tetraoxidanyl		2.0	0.2	± 3.0	kJ/mol	65.0055 ± 0.0012	69696-93-1*0
2-Propenylidene		417.4	410.5	± 1.5	kJ/mol	40.0639 ± 0.0024	19527-08-3*0
Chloromethane		-106.11	-102.15	± 0.25	kJ/mol	50.4872 ± 0.0012	74-87-3*590
Hydroperoxonium		738.1	727.8	± 1.2	kJ/mol	35.02207 ± 0.00064	70850-26-9*0
Cyanic fluoride anion		-20.4	-18.4	± 2.9	kJ/mol	45.01639 ± 0.00080	34507-50-1*0
Methyl bromide cation		996.84	981.93	± 0.27	kJ/mol	94.9380 ± 0.0013	12538-70-4*0
1-Propen-1-yl-3-ylidene		656.6	653.1	± 2.0	kJ/mol	39.0559 ± 0.0024	84654-90-0*12
Oxoniumyl ion		978.716	975.565	± 0.028	kJ/mol	18.01473 ± 0.00033	56583-62-1*2
Trihydrogen cation		1110.577	1106.695	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*1
Hydroperoxonium		762.5	752.7	± 2.0	kJ/mol	35.02207 ± 0.00064	70850-26-9*2
Water anion		-50.1	-53.0	± 4.3	kJ/mol	18.01583 ± 0.00033	12259-30-2*0
Aminomethylidyne anion		481.6	478.0	± 3.2	kJ/mol	28.03387 ± 0.00082	96808-04-7*1
Dioxohydrazine		192.2	188.7	± 1.8	kJ/mol	60.01228 ± 0.00062	16824-89-8*1
1-Propen-1-yl-3-ylidene		665.7	662.2	± 2.0	kJ/mol	39.0559 ± 0.0024	84654-90-0*13
Hydrogen peroxide cation		897.25	890.25	± 0.51	kJ/mol	34.01413 ± 0.00062	12325-10-9*12
Nitrogen sesquioxide cation		1027.6	1023.7	± 4.8	kJ/mol	76.01113 ± 0.00091	10544-73-70
Hydrogen isocyanide anion		191.50	191.68	± 0.33	kJ/mol	27.02593 ± 0.00081	96913-22-3*0
1-Propen-1-yl-3-ylidene		699.2	696.3	± 3.4	kJ/mol	39.0559 ± 0.0024	84654-90-0*2
Ethylidene		361.20	354.22	± 0.51	kJ/mol	28.0532 ± 0.0016	4218-50-2*0
Hydroxyformyl		-181.13	-183.67	± 0.44	kJ/mol	45.0174 ± 0.0010	2564-86-5*0
Iodine monochloride		-36.511	-35.537	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*500
Acetone enol		-152.0	-168.9	± 1.1	kJ/mol	58.0791 ± 0.0025	29456-04-0*0
Diazenide		175.6	176.7	± 1.6	kJ/mol	29.02197 ± 0.00016	71004-29-0*0
Peroxyhypochlorous acid cation		1030.3	1024.5	± 2.5	kJ/mol	68.4589 ± 0.0011	67952-07-20
Dinitrogen tetraoxide		-37.86	-27.01	± 0.19	kJ/mol	92.0111 ± 0.0012	10544-72-6*500
Hydroxyformyl anion		-319.52	-321.38	± 0.58	kJ/mol	45.0180 ± 0.0010	78944-70-4*0
Methyl iodide cation		944.80	935.40	± 0.18	kJ/mol	141.93844 ± 0.00083	12538-72-6*0
Isocyanogen chloride anion		102.8	107.2	± 3.9	kJ/mol	61.4707 ± 0.0012	923019-39-0*0
Fluorine atom		82.096	83.881	± 0.048	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*2
2-Hydroxyethenyl		138.01	132.19	± 0.92	kJ/mol	43.0446 ± 0.0016	108665-16-3*0
Nitrosodioxaziridine		415.3	409.5	± 2.8	kJ/mol	76.01168 ± 0.00091	132871-99-9*3
Methyl nitrite		-52.56	-64.52	± 0.90	kJ/mol	61.0401 ± 0.0010	624-91-9*1
Methyl nitrite			-88.91	± 0.56	kJ/mol	61.0401 ± 0.0010	624-91-9*500
1,2-Dibromoethene		121.1	100.9	± 2.1	kJ/mol	185.8453 ± 0.0026	540-49-8*0
Fluoroform			-704.45	± 0.43	kJ/mol	70.01385 ± 0.00080	75-46-7*590
Chlorine atom		130.176	131.783	± 0.0011	kJ/mol	35.45270 ± 0.00090	22537-15-1*2
Vinyl alcohol cation		778.7	767.7	± 1.3	kJ/mol	44.0520 ± 0.0017	57239-63-1*0
Trihydrogen		745.878	743.199	± 0.062	kJ/mol	3.02382 ± 0.00021	12184-91-7*0
2,2,4-Trimethylpentane		-171.3	-223.7	± 1.5	kJ/mol	114.2285 ± 0.0065	540-84-1*0
Dioxoethylium		688.1	689.4	± 3.1	kJ/mol	57.0276 ± 0.0017	1994332-01-20
Dichlorovinylidene		421.6	424.9	± 3.0	kJ/mol	94.9268 ± 0.0024	20394-25-6*0
Dioxohydrazine		172.89	171.13	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*0
Hydroperoxyimidogen		111.8	108.9	± 2.8	kJ/mol	47.01348 ± 0.00061	877456-58-1*2
Chlorovinylidene		428.0	429.7	± 3.0	kJ/mol	60.4820 ± 0.0018	70277-82-6*0
Carbonylmethyloxonium		561.4	553.2	± 3.2	kJ/mol	59.0435 ± 0.0017	24434-00-2*0
Carbon atom		2.391	1.863	± 0.044	kJ/mol	12.01070 ± 0.00080	7440-44-0*501
Perchloric acid cation		1191.8	1182.2	± 3.5	kJ/mol	100.4577 ± 0.0015	91712-47-9*0
Trioxodinitrate anion		-104.3	-107.5	± 1.9	kJ/mol	76.01223 ± 0.00091	194856-62-7*0
Hydroxymethylene cation		971.9	968.3	± 1.4	kJ/mol	30.02543 ± 0.00087	135395-06-1*0
1,2-Difluoroethene		-302.90	-308.99	± 0.90	kJ/mol	64.0341 ± 0.0016	1691-13-0*0
Water		-238.647	-241.835	± 0.026	kJ/mol	18.01528 ± 0.00033	7732-18-5*1
1,1-Dibromoethane			-67.2	± 1.3	kJ/mol	187.8612 ± 0.0026	557-91-5*500
Dichloromethylene		229.51	230.69	± 0.64	kJ/mol	82.9161 ± 0.0020	1605-72-7*0
Nitrosodioxaziridine		413.6	408.2	± 1.8	kJ/mol	76.01168 ± 0.00091	132871-99-9*0
Methoxyoxomethyl		-152.5	-160.2	± 1.5	kJ/mol	59.0440 ± 0.0017	16481-04-2*0
Oxiranylidene		213.5	209.2	± 1.4	kJ/mol	42.0367 ± 0.0016	50983-85-2*0
Ethenol		-113.12	-123.51	± 0.52	kJ/mol	44.0526 ± 0.0017	557-75-5*0
Ethanedial anion		-189.2	-190.8	± 3.3	kJ/mol	57.0287 ± 0.0017	1994332-01-2*0
Imidogen		358.74	358.78	± 0.16	kJ/mol	15.014680 ± 0.000099	13774-92-0*1
Difluorovinylidene anion		-88.2	-87.1	± 2.3	kJ/mol	62.0188 ± 0.0016	107693-92-5*0
Carbon atom		1114.960	1120.106	± 0.047	kJ/mol	12.01070 ± 0.00080	7440-44-0*3
Dibromovinylidene		510.9	499.8	± 4.1	kJ/mol	183.8294 ± 0.0026	261771-36-2*0
Fluorovinylidene		298.9	300.1	± 3.1	kJ/mol	44.0277 ± 0.0016	70302-00-0*0
Isocyanic fluoride anion		74.3	75.9	± 5.7	kJ/mol	45.01639 ± 0.00080	357426-78-9*0
Krypton dication		3701.124	3701.124	± 0.013	kJ/mol	83.7989 ± 0.1000	18469-91-5*0
1,2-Propadien-1-yl-3-ylidene anion		622.0	629.4	± 1.3	kJ/mol	36.0326 ± 0.0024	109292-47-9*1
Xenon dication		3194.14	3194.14	± 0.36	kJ/mol	131.2889 ± 0.0200	14066-95-6*0
Methoxyoxomethyl		-151.8	-160.8	± 2.2	kJ/mol	59.0440 ± 0.0017	16481-04-2*2
Diazanide		249.3	239.2	± 3.1	kJ/mol	31.03785 ± 0.00025	25415-88-7*0
Cyanogen bromide cation		1331.6	1325.2	± 1.1	kJ/mol	105.9209 ± 0.0013	34749-77-4*0
3-Buten-2-one		-95.57	-111.11	± 0.87	kJ/mol	70.0898 ± 0.0032	78-94-4*0
Dioxymethylene		341.8	339.8	± 3.0	kJ/mol	45.0174 ± 0.0010	438586-67-5*0
3-Buten-2-one		-94.0	-110.0	± 1.6	kJ/mol	70.0898 ± 0.0032	78-94-4*2
Dicarbon monoxide		377.12	381.16	± 0.83	kJ/mol	40.0208 ± 0.0016	12071-23-7*0
1,3-Butadien-2-ol		-48.5	-64.8	± 2.3	kJ/mol	70.0898 ± 0.0032	59120-04-6*12
Hydroxyoxoethenylium		866.2	864.9	± 3.5	kJ/mol	57.0276 ± 0.0017	1994332-00-10
1,3-Butadien-2-ol		-38.4	-54.7	± 2.3	kJ/mol	70.0898 ± 0.0032	59120-04-6*22
Ethynediolide		-133.2	-134.3	± 3.5	kJ/mol	57.0287 ± 0.0017	1994332-00-1*0
1,3-Butadien-2-ol		-43.2	-59.2	± 2.3	kJ/mol	70.0898 ± 0.0032	59120-04-6*2
1,3-Butadien-2-ol		-53.9	-68.8	± 1.6	kJ/mol	70.0898 ± 0.0032	59120-04-6*0
Cyanogen chloride cation		1326.05	1327.38	± 0.97	kJ/mol	61.4696 ± 0.0012	37612-72-9*0
Methoxyoxomethyl		-151.6	-159.7	± 2.2	kJ/mol	59.0440 ± 0.0017	16481-04-2*3
2-Hydroxyethylium		1019.1	1007.0	± 1.5	kJ/mol	45.0600 ± 0.0017	38607-31-7*0
Bromovinylidene		466.6	460.5	± 3.8	kJ/mol	104.9333 ± 0.0019	161957-27-3*0
Water dimer cation		556.8	546.4	± 3.0	kJ/mol	36.03001 ± 0.00066	158061-35-9*0
Hydroxymethylene anion		147.1	144.2	± 1.6	kJ/mol	30.02653 ± 0.00087	207914-87-2*0
Trioxygen difluoride		113.4	107.6	± 2.1	kJ/mol	85.99501 ± 0.00090	16829-28-0*2
1,2-Propadien-1-one anion		49.5	48.3	± 3.1	kJ/mol	54.0479 ± 0.0024	159171-62-7*0
Difluorophosgene anion		-602.3	-604.2	± 3.3	kJ/mol	66.00745 ± 0.00085	474815-26-4*0
1,2-Dichloroethene		3.47	-1.85	± 0.54	kJ/mol	96.9427 ± 0.0024	540-59-0*0
Isocyanogen bromide cation		1470.2	1464.5	± 5.9	kJ/mol	105.9209 ± 0.0013	238754-53-5*0
2-Cyclopropen-1-one cation		1078.6	1075.5	± 2.0	kJ/mol	54.0468 ± 0.0024	100815-68-7*0
Hypochloroperoxoous acid, hydroxy ester		49.1	42.3	± 1.9	kJ/mol	84.4588 ± 0.0013	928652-99-7*0
Oxirene		273.18	271.02	± 0.92	kJ/mol	42.0367 ± 0.0016	157-18-6*0
Cyclopropane		41.41	35.72	± 0.53	kJ/mol	42.0797 ± 0.0024	75-19-4*500
Cyanogen chloride anion		46.7	51.0	± 3.1	kJ/mol	61.4707 ± 0.0012	12281-43-5*0
Fluoro(fluorooxy)methylene		-134.8	-136.0	± 1.3	kJ/mol	66.00691 ± 0.00085	479587-30-9*0
Isourea		-156.2	-172.8	± 2.6	kJ/mol	60.05534 ± 0.00091	4744-36-9*0
Bromoform			3.5	± 1.3	kJ/mol	252.7306 ± 0.0031	75-25-2*590
mu-Oxodioxodinitrogen		984.0	981.0	± 3.2	kJ/mol	76.01113 ± 0.00091	87950-63-8*1
Carbamoyl anion		-81.7	-87.6	± 3.1	kJ/mol	44.03327 ± 0.00087	78944-69-1*0
Fluorosyl fluoride		192.6	193.1	± 2.3	kJ/mol	53.99621 ± 0.00030	86825-57-2*0
Fluorosyl fluoride anion		-147.2	-146.9	± 3.0	kJ/mol	53.99675 ± 0.00030	86825-57-20
Acetyloxoniumylidene		891.7	883.2	± 3.0	kJ/mol	59.0435 ± 0.0017	67057-47-0*1
Chloromethylene		320.27	320.55	± 0.89	kJ/mol	48.4713 ± 0.0012	2108-20-5*0
Nitrosyl nitrite anion		-103.1	-106.2	± 2.8	kJ/mol	76.01223 ± 0.00091	122413-35-80
Peroxychlorous acid		102.3	96.2	± 3.7	kJ/mol	84.4588 ± 0.0013	177778-92-6*3
Formaldoxime		30.7	20.1	± 1.4	kJ/mol	45.04066 ± 0.00088	75-17-2*0
Difluoromethane			-468.73	± 0.36	kJ/mol	52.02339 ± 0.00081	75-10-5*590
Methoxyethene		-89.2	-106.5	± 1.1	kJ/mol	58.0791 ± 0.0025	107-25-5*0
Isocyanic fluoride cation		1618.4	1619.0	± 4.0	kJ/mol	45.01529 ± 0.00080	16992-26-00
Hydrogen peroxide cation		931.01	924.12	± 0.98	kJ/mol	34.01413 ± 0.00062	12325-10-9*21
Phosgene cation		897.1	896.0	± 1.7	kJ/mol	98.9150 ± 0.0020	73249-38-4*0
Methoxyethene		-81.8	-98.9	± 2.4	kJ/mol	58.0791 ± 0.0025	107-25-5*1
Phosgene			-242.74	± 0.27	kJ/mol	98.9155 ± 0.0020	75-44-5*501
Phosgene		-255.44	-242.74	± 0.27	kJ/mol	98.9155 ± 0.0020	75-44-5*502
Hydrazoic acid anion		309.0	303.2	± 2.3	kJ/mol	43.02871 ± 0.00022	203264-98-6*0
Hydrazoic acid			261.49	± 0.65	kJ/mol	43.02816 ± 0.00022	7782-79-8*500
Methylaminyliumyl		1423.0	1416.1	± 2.3	kJ/mol	29.04071 ± 0.00083	56924-51-7*2
Diazene cation		1132.46	1125.80	± 0.64	kJ/mol	30.02881 ± 0.00020	76986-17-9*0
Chloro(chlorooxy)methylene		73.5	73.9	± 3.6	kJ/mol	98.9155 ± 0.0020	479587-31-0*0
Oxide		651.	653.	± 15.	kJ/mol	16.00050 ± 0.00030	16833-27-5*0
Hydrogen peroxide		-129.459	-135.465	± 0.063	kJ/mol	34.01468 ± 0.00062	7722-84-1*1
Chlorous acid cation		996.6	991.5	± 3.1	kJ/mol	68.4589 ± 0.0011	99559-66-70
Oxonium			-285.830	± 0.026	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
Chloro(chlorooxy)methylene		98.	105.	± 15.	kJ/mol	98.9155 ± 0.0020	479587-31-0*1
Chlorine chlorite		168.6	166.4	± 1.3	kJ/mol	102.9042 ± 0.0019	105206-44-8*0
Diazene cation		1132.46	1125.52	± 0.64	kJ/mol	30.02881 ± 0.00020	76986-17-9*1
Chlorohydroxymethyl		-54.8	-60.5	± 1.1	kJ/mol	65.4787 ± 0.0012	147139-06-8*0
1-Cyanoethylidene		437.5	433.7	± 1.5	kJ/mol	53.0627 ± 0.0024	498544-34-6*0
Hydrobromate ion		-5.6	-12.1	± 4.3	kJ/mol	80.9125 ± 0.0010	85532-97-4*0
Oxoiodonium		1066.1	1064.1	± 1.9	kJ/mol	142.90332 ± 0.00030	81182-81-2*0
O--HH Complex		247.6	248.9	± 2.7	kJ/mol	18.01528 ± 0.00033	7732-18-5101
Ethoxyethene		-117.7	-136.2	± 1.5	kJ/mol	72.1057 ± 0.0033	109-92-2*0
Chloroethane		-134.29	-135.91	± 0.27	kJ/mol	64.5138 ± 0.0019	75-00-3*500
Ethoxyethene		-111.2	-135.1	± 2.3	kJ/mol	72.1057 ± 0.0033	109-92-2*21
Ethoxyethene		-110.7	-132.9	± 2.6	kJ/mol	72.1057 ± 0.0033	109-92-2*1
3-Imino-2-propen-1-ylidene		530.6	526.3	± 1.2	kJ/mol	53.0627 ± 0.0024	916765-05-4*0
Oxoethylidene		261.1	258.3	± 1.1	kJ/mol	42.0367 ± 0.0016	39920-84-8*0
3-Imino-2-propen-1-ylidene		571.8	567.0	± 1.6	kJ/mol	53.0627 ± 0.0024	916765-05-4*2
Nitrous acid anion		-105.85	-109.32	± 0.78	kJ/mol	47.01403 ± 0.00061	256393-36-9*0
Ethoxyethene		-108.7	-131.9	± 2.3	kJ/mol	72.1057 ± 0.0033	109-92-2*11
Propylidyne		492.4	482.7	± 1.2	kJ/mol	41.0718 ± 0.0024	85056-54-8*0
Peroxyhypochlorous acid anion		-32.2	-34.0	± 2.6	kJ/mol	68.4600 ± 0.0011	67952-08-30
2-(Methylidyneamino)ethenyl		600.6	596.3	± 1.2	kJ/mol	53.0627 ± 0.0024	123416-74-0*0
Chlorohydroxymethylene		14.3	11.4	± 3.2	kJ/mol	64.4707 ± 0.0012	147723-60-2*2
2-(Methylidyneamino)ethenyl		634.4	630.4	± 1.6	kJ/mol	53.0627 ± 0.0024	123416-74-0*2
COC vdW		589.7	598.5	± 1.5	kJ/mol	40.0208 ± 0.0016	12071-24-80
Chlorohydroxymethylene		13.9	11.2	± 2.6	kJ/mol	64.4707 ± 0.0012	147723-60-2*0
Cyanogen iodide cation		1271.4	1271.2	± 1.6	kJ/mol	152.92136 ± 0.00080	34749-78-5*0
2-Oxo-1-ethylium-1-yl		1289.4	1286.7	± 2.5	kJ/mol	42.0361 ± 0.0016	214464-96-7*1
Hydroxyamidogen		101.36	94.53	± 0.81	kJ/mol	32.02202 ± 0.00034	13940-32-4*0
Hydrogen cyanide anion		129.509	129.030	± 0.090	kJ/mol	27.02593 ± 0.00081	12334-27-9*0
Hydrogen peroxide cation		897.23	890.25	± 0.51	kJ/mol	34.01413 ± 0.00062	12325-10-9*0
(Chlorooxy)methylene		155.4	155.2	± 3.7	kJ/mol	64.4707 ± 0.0012	331419-80-8*1
(Chlorooxy)methylene		119.1	117.8	± 2.7	kJ/mol	64.4707 ± 0.0012	331419-80-8*0
Chlorous acid anion		-154.3	-156.2	± 3.3	kJ/mol	68.4600 ± 0.0011	99559-66-7*0
(Methylamino)methyl anion		201.1	184.1	± 3.2	kJ/mol	44.0763 ± 0.0017	31277-25-50
Dichlorine cation		1108.307	1108.286	± 0.0062	kJ/mol	70.9049 ± 0.0018	12595-90-3*0
Dioxyamidogen		251.1	244.5	± 2.5	kJ/mol	47.01348 ± 0.00061	71843-95-3*1
2-Cyanovinyl		447.9	445.5	± 1.2	kJ/mol	52.0547 ± 0.0024	189141-20-6*0
2-Cyanovinylium		1517.2	1515.1	± 1.8	kJ/mol	52.0542 ± 0.0024	85398-67-0*2
2-Cyanovinyl anion		263.7	261.4	± 1.8	kJ/mol	52.0553 ± 0.0024	85398-67-00
Isocyanic acid anion		-54.3	-57.4	± 3.0	kJ/mol	43.02533 ± 0.00086	444010-28-00
1,2-Butadiene		137.58	138.64	± 0.66	kJ/mol	54.0904 ± 0.0032	590-19-2*500
2-Isocyanovinyl		543.1	541.7	± 1.7	kJ/mol	52.0547 ± 0.0024	225798-14-1*0
(Formyloxy)methyl		-151.9	-160.0	± 1.3	kJ/mol	59.0440 ± 0.0017	3122-12-1*0
Hydroxyaminylium		1019.5	1012.4	± 2.5	kJ/mol	32.02147 ± 0.00034	66097-71-0*0
Cyanomethyliumyl		1506.7	1508.2	± 2.3	kJ/mol	39.0355 ± 0.0016	34447-38-6*0
Cyanomethylene anion		286.6	287.1	± 1.5	kJ/mol	39.0366 ± 0.0016	12373-24-9*0
Cyanomethylene		479.9	483.3	± 1.1	kJ/mol	39.0361 ± 0.0016	2612-62-6*0
Carboxymethyl		-227.4	-237.3	± 1.2	kJ/mol	59.0440 ± 0.0017	2887-46-9*0
Chloroformyl anion		-356.5	-352.9	± 3.3	kJ/mol	63.4633 ± 0.0012	41976-93-6*0
Isocyanomethyliumyl		1505.9	1507.8	± 3.3	kJ/mol	39.0355 ± 0.0016	99045-54-2*0
Isocyanomethylene anion		400.6	401.3	± 2.1	kJ/mol	39.0366 ± 0.0016	144141-01-5*0
Isocyanomethylene		582.3	584.6	± 1.7	kJ/mol	39.0361 ± 0.0016	78694-65-2*0
Isoformyl anion		55.7	58.4	± 1.8	kJ/mol	29.01859 ± 0.00086	81747-63-9*0
3-Oxo-1,2-propadien-1-ylium-1-yl		1379.9	1385.2	± 3.9	kJ/mol	52.0310 ± 0.0024	151455-13-9*0
3-Oxo-1,2-propadienylidene anion		224.0	229.8	± 3.6	kJ/mol	52.0320 ± 0.0024	109292-50-4*0
Propynylidene		597.6	599.4	± 1.3	kJ/mol	38.0480 ± 0.0024	67152-18-5*2
Oxoethylidene anion		86.9	84.2	± 2.1	kJ/mol	42.0372 ± 0.0016	106543-38-8*0
Ethane anion		41.8	26.5	± 4.4	kJ/mol	30.0696 ± 0.0017	54064-82-3*0
2-Propenylidene		419.0	411.4	± 2.3	kJ/mol	40.0639 ± 0.0024	19527-08-3*12
Propargylenide		434.4	437.6	± 1.1	kJ/mol	38.0485 ± 0.0024	82906-05-6*0
Cyanic acid cation		1135.8	1133.2	± 2.9	kJ/mol	43.02423 ± 0.00086	59780-31-3*0
Cyanic acid anion		-9.2	-9.5	± 3.1	kJ/mol	43.02533 ± 0.00086	58199-47-6*0
Trihydrogen		254.5	250.7	± 1.2	kJ/mol	3.02382 ± 0.00021	12184-91-7*200
Ethylene anion		232.0	225.6	± 2.0	kJ/mol	28.0537 ± 0.0016	34527-91-8*0
Cyclobutenyl anion		318.3	305.9	± 3.7	kJ/mol	53.0830 ± 0.0032	60211-42-9*0
Hydrodioxonitrogen cation		1130.2	1123.6	± 3.0	kJ/mol	47.01293 ± 0.00061	252986-76-8*0
Methylaminyliumyl		1388.3	1381.9	± 2.3	kJ/mol	29.04071 ± 0.00083	56924-51-7*0
2-Methoxy-2-oxoethyl		-203.4	-218.7	± 1.6	kJ/mol	73.0706 ± 0.0025	54668-31-4*0
Peroxyformic acid		-279.38	-288.52	± 0.88	kJ/mol	62.0248 ± 0.0012	107-32-4*0
Phenylperoxy cation		1018.0	1001.0	± 3.1	kJ/mol	109.1022 ± 0.0049	956036-17-2*0
Phenylperoxy anion		-39.8	-56.8	± 3.3	kJ/mol	109.1032 ± 0.0049	956036-17-20
Oxirene		387.8	384.5	± 1.4	kJ/mol	42.0367 ± 0.0016	157-18-6*1
Hydrodioxonitrate		-61.8	-68.2	± 3.2	kJ/mol	47.01403 ± 0.00061	61508-71-2*0
2-Iodoethanol		-132.0	-150.2	± 2.5	kJ/mol	171.9650 ± 0.0017	624-76-0*0
Pentachloroethylium		836.2	834.5	± 3.3	kJ/mol	201.2844 ± 0.0048	7094-17-90
Nitrosodioxaziridine		413.9	408.1	± 3.2	kJ/mol	76.01168 ± 0.00091	132871-99-9*2
Fulvene cation		1042.9	1027.2	± 2.8	kJ/mol	78.1113 ± 0.0048	34504-75-1*0
Fulvene anion		190.7	175.7	± 4.1	kJ/mol	78.1124 ± 0.0048	34504-63-7*0
Dioxodiazoxane		93.0	88.1	± 1.3	kJ/mol	76.01168 ± 0.00091	122413-35-8*0
Isofulminic acid cation		1377.0	1374.9	± 2.9	kJ/mol	43.02423 ± 0.00086	117800-60-9*0
Chlorine pentafluoride anion		-619.3	-622.7	± 4.4	kJ/mol	130.44526 ± 0.00090	184851-42-1*0
Diazene		207.09	199.95	± 0.41	kJ/mol	30.02936 ± 0.00020	3618-05-1*0
Silicon cation		1232.75	1236.88	± 0.20	kJ/mol	28.08495 ± 0.00030	14067-07-3*0
Silicon anion		312.17	315.15	± 0.20	kJ/mol	28.08605 ± 0.00030	14337-02-1*0
Difluorodioxidanium		1283.6	1280.0	± 2.3	kJ/mol	69.99506 ± 0.00060	7783-44-00
Pentachloroethanide		-283.7	-282.2	± 3.9	kJ/mol	201.2854 ± 0.0048	263019-83-6*0
Iminomethyl		275.79	272.18	± 0.61	kJ/mol	28.03332 ± 0.00082	15691-95-9*0
Tetraoxidanyl		76.7	69.5	± 6.1	kJ/mol	65.0055 ± 0.0012	69696-93-1*1
Imidogen		509.33	509.38	± 0.18	kJ/mol	15.014680 ± 0.000099	13774-92-0*2
Silicon carbide		-71.0	-72.1	± 1.4	kJ/mol	40.09620 ± 0.00085	409-21-2*500
(Dimethylamino)methyl anion		189.9	165.7	± 3.3	kJ/mol	58.1029 ± 0.0025	125231-49-4*0
Chlorine trifluoride anion		-480.4	-481.9	± 3.6	kJ/mol	92.44846 ± 0.00090	184289-50-7*0
(Acetyloxy)methyl		-200.7	-214.5	± 1.6	kJ/mol	73.0706 ± 0.0025	2887-49-2*0
Quartz		-906.11	-911.09	± 0.94	kJ/mol	60.08430 ± 0.00067	14808-60-7*501
Chlorine pentafluoride cation		1005.8	996.8	± 3.3	kJ/mol	130.44417 ± 0.00090	478167-78-1*0
Quartz		-900.8	-905.6	± 1.6	kJ/mol	60.08430 ± 0.00067	14808-60-7*515
1-Methylethylidene		315.92	303.02	± 0.99	kJ/mol	42.0797 ± 0.0024	40852-89-9*0
Neon dication		6032.988	6033.214	± 0.0041	kJ/mol	20.17860 ± 0.00060	14041-55-5*0
Neon trication		12152.403	12152.403	± 0.033	kJ/mol	20.17805 ± 0.00060	14158-25-9*0
Neon tetracation		21529.82	21531.45	± 0.25	kJ/mol	20.17751 ± 0.00060	14041-56-6*0
Neon pentacation		33711.1	33711.1	± 1.2	kJ/mol	20.17696 ± 0.00060	14175-48-5*0
Neon hexacation		48949.3	48949.3	± 1.3	kJ/mol	20.17641 ± 0.00060	14041-57-7*0
Neon heptacation		68948.7	68948.7	± 1.5	kJ/mol	20.17586 ± 0.00060	14175-50-9*0
Neon octacation		92018.2	92018.2	± 1.5	kJ/mol	20.17531 ± 0.00060	14782-26-4*0
Neon nonacation		207396.1	207396.1	± 1.5	kJ/mol	20.17476 ± 0.00060	15721-59-2*0
Neon cation		2080.662	2080.769	± 0.000	kJ/mol	20.17915 ± 0.00060	14782-23-1*0
Neon decacation		338828.3	338828.3	± 1.5	kJ/mol	20.17421 ± 0.00060	32218-07-8*0
Argon dimer cation		1393.760	1391.173	± 0.018	kJ/mol	79.8955 ± 0.0020	17596-58-6*0
Argon cation		1520.571	1520.580	± 0.000	kJ/mol	39.94745 ± 0.00100	14791-69-6*0
Argon dimer		-1.013	-6.347	± 0.0051	kJ/mol	79.8960 ± 0.0020	12595-59-4*0
Helium cation		2372.322	2372.322	± 0.000	kJ/mol	4.0020534 ± 0.0000020	14234-48-1*0
Helium dication		7622.839	7622.839	± 0.000	kJ/mol	4.0015048 ± 0.0000020	12587-46-1*0
Helium anion		51.	51.	± 130.	kJ/mol	4.0031506 ± 0.0000020	14452-58-5*1
Helium anion		51.	51.	± 130.	kJ/mol	4.0031506 ± 0.0000020	14452-58-5*0
Argon anion		23.	23.	± 75.	kJ/mol	39.94855 ± 0.00100	16544-90-4*1
Argon anion		23.	23.	± 75.	kJ/mol	39.94855 ± 0.00100	16544-90-4*0
Helium anion		1868.43	1868.43	± 0.11	kJ/mol	4.0031506 ± 0.0000020	14452-58-5*2
Helium anion		1904.823	1904.824	± 0.0011	kJ/mol	4.0031506 ± 0.0000020	14452-58-5*3
Helium anion		5724.9	5724.9	± 1.5	kJ/mol	4.0031506 ± 0.0000020	14452-58-5*4
Argon anion		1111.116	1111.116	± 0.098	kJ/mol	39.94855 ± 0.00100	16544-90-4*2
Hydron		0	0	exact		1.007391 ± 0.000070	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, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. 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, Active Thermochemical Tables: Thermochemistry for the 21^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, Active Thermochemical Tables (ATcT) values based on ver. 1.122q of the Thermochemical Network, Argonne National Laboratory, Lemont, Illinois 2021 [DOI: 10.17038/1821118]; available at ATcT.anl.gov
4		D. Feller, D. H. Bross, and B. Ruscic, Enthalpy of Formation of N2H4 (Hydrazine) Revisited. J. Phys. Chem. A 121, 6187-6198 (2017) [DOI: 10.1021/acs.jpca.7b06017]
5		D. Feller, D. H. Bross, and B. Ruscic, Enthalpy of Formation of C2H2O4 (Oxalic Acid) from High-Level Calculations and the Active Thermochemical Tables Approach. J. Phys. Chem. A 123, 3481-3496 (2019) [DOI: 10.1021/acs.jpca.8b12329]
6		B. K. Welch, R. Dawes, D. H. Bross, and B. Ruscic, An Automated Thermochemistry Protocol Based on Explicitly Correlated Coupled-Cluster Theory: The Methyl and Ethyl Peroxy Families. J. Phys. Chem. A 123, 5673-5682 (2019) [DOI: 10.1021/acs.jpca.8b12329]
7		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]

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 [7]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on 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: 04/05/2025

Privacy & Security Notice | Contact Us