Selected ATcT [1, 2] enthalpy of formation based on version 1.176 of the Thermochemical Network [3]This version of ATcT results[3] was generated by additional expansion of version 1.172 to include species related to Criegee intermediates that are involved in several ongoing studies[4].
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Ethylene cation |
Formula: [CH2CH2]+ (g) |
CAS RN: 34470-02-5 |
ATcT ID: 34470-02-5*0 |
SMILES: C=[CH2+] |
InChI: InChI=1S/C2H4/c1-2/h1-2H2/q+1 |
InChIKey: RHAJFDHSLMUKSD-UHFFFAOYSA-N |
Hills Formula: C2H4+ |
2D Image: |
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Aliases: [CH2CH2]+; Ethylene cation; Ethylene ion (1+); Ethene cation; Ethene ion (1+); CH2CH2+; [H2CCH2]+; H2CCH2+ |
Relative Molecular Mass: 28.0526 ± 0.0016 |
ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units |
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1075.21 | 1067.99 | ± 0.11 | kJ/mol |
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3D Image of [CH2CH2]+ (g) |
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Top contributors to the provenance of ΔfH° of [CH2CH2]+ (g)The 20 contributors listed below account only for 41.1% of the provenance of ΔfH° of [CH2CH2]+ (g). A total of 911 contributors would be needed to account for 90% of the provenance.
Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.
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Contribution (%) | TN ID | Reaction | Measured Quantity | Reference | 7.7 | 2529.1 | CH2CH2 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (cr,l)  | ΔrH°(298.15 K) = -1411.18 ± 0.30 kJ/mol | Rossini 1937 | 5.3 | 2375.1 | 2 H2 (g) + C (graphite) → CH4 (g)  | ΔrG°(1165 K) = 37.521 ± 0.068 kJ/mol | Smith 1946, note COf, 3rd Law | 3.0 | 125.2 | 1/2 O2 (g) + H2 (g) → H2O (cr,l)  | ΔrH°(298.15 K) = -285.8261 ± 0.040 kJ/mol | Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930 | 2.8 | 3793.1 | CH2(CH2CH2CH2) (g) → 2 CH2CH2 (g)  | ΔrG°(750 K) = -13.37 ± 0.12 kcal/mol | Quick 1972, 3rd Law, note unc3 | 2.7 | 2530.1 | CH2CH2 (g) + H2 (g) → CH3CH3 (g)  | ΔrH°(355.15 K) = -32.831 ± 0.05 kcal/mol | Kistiakowsky 1935 | 2.6 | 9233.2 | C6H4(C2H2(CC(C4H4))) (g) + 18 CH4 (g) → 9 CH3CH3 (g) + 7 CH2CH2 (g)  | ΔrH°(0 K) = 776.95 ± 6 kJ/mol | Dorofeeva 2022, est unc | 1.7 | 3471.15 | CH2CCH2 (g) + CH4 (g) → 2 CH2CH2 (g)  | ΔrH°(0 K) = -8.78 ± 0.8 kJ/mol | Ferguson 2013, est unc | 1.6 | 2268.11 | CO (g) → C (g) + O (g)  | ΔrH°(0 K) = 1071.92 ± 0.10 kJ/mol | Thorpe 2021 | 1.4 | 2228.7 | C (graphite) + O2 (g) → CO2 (g)  | ΔrH°(298.15 K) = -393.464 ± 0.024 kJ/mol | Hawtin 1966, note CO2e | 1.4 | 2469.1 | CH3CH3 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (cr,l)  | ΔrH°(298.15 K) = -1560.68 ± 0.25 (×1.384) kJ/mol | Pittam 1972 | 1.3 | 2530.2 | CH2CH2 (g) + H2 (g) → CH3CH3 (g)  | ΔrG°(723.15 K) = -10.867 ± 0.072 kcal/mol | Kistiakowsky 1951 | 1.2 | 9196.2 | C6H4(C4H4) (g) + 12 CH4 (g) → 6 CH3CH3 (g) + 5 CH2CH2 (g)  | ΔrH°(0 K) = 516.00 ± 6 kJ/mol | Dorofeeva 2022, est unc | 1.2 | 3797.1 | CH2(CH2CH2CH2) (l) + 6 O2 (g) → 4 CO2 (g) + 4 H2O (l)  | ΔrH°(298.15 K) = -650.33 ± 0.12 kcal/mol | Kaarsemaker 1952, Coops 1950, as quoted by Cox 1970 | 1.1 | 2613.5 | 2 CH2CH2 (g) → HCCH (g) + CH3CH3 (g)  | ΔrH°(0 K) = 9.26 ± 0.20 kcal/mol | Karton 2007 | 1.0 | 3471.11 | CH2CCH2 (g) + CH4 (g) → 2 CH2CH2 (g)  | ΔrH°(0 K) = -2.24 ± 0.25 kcal/mol | Karton 2009b, Karton 2011 | 1.0 | 2286.9 | C (graphite) + CO2 (g) → 2 CO (g)  | ΔrG°(1165 K) = -33.545 ± 0.058 kJ/mol | Smith 1946, note COf, 3rd Law | 0.9 | 2515.1 | CH2CH2 (g) → 2 C (g) + 4 H (g)  | ΔrH°(0 K) = 2226.23 ± 0.70 kJ/mol | Harding 2007, Ferguson 2013 | 0.9 | 6107.1 | CH3CH2Cl (g) + 3 O2 (g) → 2 CO2 (g) + HCl (aq, 600 H2O) + 2 H2O (cr,l)  | ΔrH°(298.15 K) = -1413.04 ± 0.59 kJ/mol | Fletcher 1971 | 0.8 | 7127.6 | C6H4(CH2CH2CH2) (g) + 7 CH4 (g) → 5 CH2CH2 (g) + 3 CH3CH3 (g)  | ΔrH°(0 K) = 474.41 ± 6 kJ/mol | Dorofeeva 2022, est unc | 0.7 | 2278.2 | CO (g) → C+ (g) + O (g)  | ΔrH°(0 K) = 22.3713 ± 0.0015 eV | Ng 2007 |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of [CH2CH2]+ (g) |
Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances. The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.
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Correlation Coefficent (%) | Species Name | Formula | Image | ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units | Relative Molecular Mass | ATcT ID | 99.9 | Ethylene | CH2CH2 (g) | | 60.89 | 52.38 | ± 0.11 | kJ/mol | 28.0532 ± 0.0016 | 74-85-1*0 | 61.2 | Ethane | CH3CH3 (g) | | -68.40 | -84.03 | ± 0.12 | kJ/mol | 30.0690 ± 0.0017 | 74-84-0*0 | 48.2 | Propane | CH3CH2CH3 (g) | | -82.73 | -105.01 | ± 0.15 | kJ/mol | 44.0956 ± 0.0025 | 74-98-6*0 | 44.6 | Carbon | C (g, singlet) | | 833.312 | 838.459 | ± 0.039 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*2 | 44.6 | Carbon | C (g, quintuplet) | | 1114.944 | 1120.091 | ± 0.039 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*3 | 44.6 | Carbon cation | C+ (g) | | 1797.834 | 1803.432 | ± 0.039 | kJ/mol | 12.01015 ± 0.00080 | 14067-05-1*0 | 44.6 | Carbon | C (g, triplet) | | 711.381 | 716.866 | ± 0.039 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*1 | 44.6 | Carbon | C (g) | | 711.381 | 716.866 | ± 0.039 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*0 | 44.6 | Carbon dication | [C]+2 (g) | | 4150.451 | 4155.597 | ± 0.039 | kJ/mol | 12.00960 ± 0.00080 | 16092-61-8*0 | 44.4 | Carbon anion | C- (g) | | 589.605 | 594.751 | ± 0.039 | kJ/mol | 12.01125 ± 0.00080 | 14337-00-9*0 |
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Most Influential reactions involving [CH2CH2]+ (g)Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.
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Influence Coefficient | TN ID | Reaction | Measured Quantity | Reference | 0.568 | 2516.2 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 84790.2 ± 0.4 cm-1 | Xing 2006, note unc | 0.429 | 2516.1 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 84790.42 ± 0.46 cm-1 | Willitsch 2004, note unc | 0.092 | 6906.6 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 25.51 ± 1.2 kcal/mol | Ruscic W1RO | 0.078 | 6906.3 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 24.96 ± 1.3 kcal/mol | Ruscic G4 | 0.078 | 6906.5 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 26.16 ± 1.3 kcal/mol | Ruscic CBS-n | 0.067 | 6906.2 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 24.68 ± 1.4 kcal/mol | Ruscic G3X | 0.052 | 6906.4 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 24.32 ± 1.6 kcal/mol | Ruscic CBS-n | 0.023 | 6906.7 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(298.15 K) = 106 ± 10 kJ/mol | Nicolaides 1997 | 0.006 | 6906.8 | [C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)  | ΔrH°(0 K) = 0.979 ± 0.2 eV | Klippenstein 1997, note unc4 | 0.001 | 2516.3 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 84799 ± 5 (×1.756) cm-1 | Williams 1991 | 0.000 | 2523.8 | [CH2CH2]+ (g) → 2 C (g) + 4 H (g)  | ΔrH°(0 K) = 289.95 ± 1.50 kcal/mol | Ruscic W1RO | 0.000 | 2523.7 | [CH2CH2]+ (g) → 2 C (g) + 4 H (g)  | ΔrH°(0 K) = 288.55 ± 1.60 kcal/mol | Ruscic CBS-n | 0.000 | 2523.4 | [CH2CH2]+ (g) → 2 C (g) + 4 H (g)  | ΔrH°(0 K) = 289.20 ± 1.60 kcal/mol | Ruscic G4 | 0.000 | 2523.3 | [CH2CH2]+ (g) → 2 C (g) + 4 H (g)  | ΔrH°(0 K) = 289.15 ± 1.72 kcal/mol | Ruscic G3X | 0.000 | 2517.7 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 10.515 ± 0.003 eV | Masclet 1973 | 0.000 | 2520.11 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 242.364 ± 0.085 kcal/mol | Feller 2017a | 0.000 | 2517.4 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 10.517 ± 0.002 (×2.181) eV | Stockbauer 1975 | 0.000 | 2517.5 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 10.517 ± 0.003 (×1.477) eV | Stockbauer 1975a | 0.000 | 2517.8 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 10.511 ± 0.005 eV | Brehm 1966 | 0.000 | 2517.2 | CH2CH2 (g) → [CH2CH2]+ (g)  | ΔrH°(0 K) = 10.514 ± 0.005 eV | Dehmer 1979, est unc |
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References
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1
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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]
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2
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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 21st Century.
J. Phys. Conf. Ser. 16, 561-570 (2005)
[DOI: 10.1088/1742-6596/16/1/078]
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3
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B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.176 of the Thermochemical Network (2024); available at ATcT.anl.gov |
4
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T. L. Nguyen et al, ongoing studies (2024)
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5
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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]
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6
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B. Ruscic and D. H. Bross,
Thermochemistry
Computer Aided Chem. Eng. 45, 3-114 (2019)
[DOI: 10.1016/B978-0-444-64087-1.00001-2]
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Formula
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The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
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Uncertainties
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The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.0005 kJ/mol.
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Website Functionality Credits
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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/.
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Acknowledgement
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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.
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