Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

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:

Aliases: [CH2CH2]+; Ethylene cation; Ethylene ion (1+); Ethene cation; Ethene ion (1+); CH2CH2+; [H2CCH2]+; H2CCH2+

Relative Molecular Mass: 28.0526 ± 0.0016

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
1075.20	1067.99	± 0.11	kJ/mol

3D Image of [CH2CH2]+ (g)

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Top contributors to the provenance of Δ_fH° of [CH2CH2]+ (g)

The 20 contributors listed below account only for 41.2% of the provenance of Δ_fH° of [CH2CH2]+ (g).
A total of 906 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.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
7.7	2529.1	CH2CH2 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -1411.18 ± 0.30 kJ/mol	Rossini 1937
5.3	2375.1	2 H2 (g) + C (graphite) → CH4 (g)	Δ_rG°(1165 K) = 37.521 ± 0.068 kJ/mol	Smith 1946, note COf, 3rd Law
2.9	125.2	1/2 O2 (g) + H2 (g) → H2O (cr,l)	Δ_rH°(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)	Δ_rG°(750 K) = -13.37 ± 0.12 kcal/mol	Quick 1972, 3rd Law, note unc3
2.7	2530.1	CH2CH2 (g) + H2 (g) → CH3CH3 (g)	Δ_rH°(355.15 K) = -32.831 ± 0.05 kcal/mol	Kistiakowsky 1935
2.6	9186.2	C6H4(C2H2(CC(C4H4))) (g) + 18 CH4 (g) → 9 CH3CH3 (g) + 7 CH2CH2 (g)	Δ_rH°(0 K) = 776.95 ± 6 kJ/mol	Dorofeeva 2022, est unc
1.7	3471.15	CH2CCH2 (g) + CH4 (g) → 2 CH2CH2 (g)	Δ_rH°(0 K) = -8.78 ± 0.8 kJ/mol	Ferguson 2013, est unc
1.6	2268.11	CO (g) → C (g) + O (g)	Δ_rH°(0 K) = 1071.92 ± 0.10 kJ/mol	Thorpe 2021
1.4	2228.7	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(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)	Δ_rH°(298.15 K) = -1560.68 ± 0.25 (×1.384) kJ/mol	Pittam 1972
1.3	2530.2	CH2CH2 (g) + H2 (g) → CH3CH3 (g)	Δ_rG°(723.15 K) = -10.867 ± 0.072 kcal/mol	Kistiakowsky 1951
1.2	9149.2	C6H4(C4H4) (g) + 12 CH4 (g) → 6 CH3CH3 (g) + 5 CH2CH2 (g)	Δ_rH°(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)	Δ_rH°(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)	Δ_rH°(0 K) = 9.26 ± 0.20 kcal/mol	Karton 2007
1.0	3471.11	CH2CCH2 (g) + CH4 (g) → 2 CH2CH2 (g)	Δ_rH°(0 K) = -2.24 ± 0.25 kcal/mol	Karton 2009b, Karton 2011
1.0	2286.9	C (graphite) + CO2 (g) → 2 CO (g)	Δ_rG°(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)	Δ_rH°(0 K) = 2226.23 ± 0.70 kJ/mol	Harding 2007, Ferguson 2013
0.9	6069.1	CH3CH2Cl (g) + 3 O2 (g) → 2 CO2 (g) + HCl (aq, 600 H2O) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -1413.04 ± 0.59 kJ/mol	Fletcher 1971
0.8	7089.6	C6H4(CH2CH2CH2) (g) + 7 CH4 (g) → 5 CH2CH2 (g) + 3 CH3CH3 (g)	Δ_rH°(0 K) = 474.41 ± 6 kJ/mol	Dorofeeva 2022, est unc
0.7	2278.2	CO (g) → C+ (g) + O (g)	Δ_rH°(0 K) = 22.3713 ± 0.0015 eV	Ng 2007

Top 10 species with enthalpies of formation correlated to the Δ_fH° 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.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(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)	-68.41	-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
44.5	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	594.752	± 0.039	kJ/mol	12.01125 ± 0.00080	14337-00-9*0

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.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
0.568	2516.2	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 84790.2 ± 0.4 cm-1	Xing 2006, note unc
0.429	2516.1	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 84790.42 ± 0.46 cm-1	Willitsch 2004, note unc
0.092	6868.6	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 25.51 ± 1.2 kcal/mol	Ruscic W1RO
0.078	6868.3	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 24.96 ± 1.3 kcal/mol	Ruscic G4
0.078	6868.5	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 26.16 ± 1.3 kcal/mol	Ruscic CBS-n
0.067	6868.2	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 24.68 ± 1.4 kcal/mol	Ruscic G3X
0.052	6868.4	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 24.32 ± 1.6 kcal/mol	Ruscic CBS-n
0.023	6868.7	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(298.15 K) = 106 ± 10 kJ/mol	Nicolaides 1997
0.006	6868.8	[C6H5]+ (g, triplet) + 2 CH2CH2 (g) → C6H6 (g) + [CH2CH2]+ (g) + CH2CH (g)	Δ_rH°(0 K) = 0.979 ± 0.2 eV	Klippenstein 1997, note unc4
0.001	2516.3	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 84799 ± 5 (×1.756) cm-1	Williams 1991
0.000	2523.8	[CH2CH2]+ (g) → 2 C (g) + 4 H (g)	Δ_rH°(0 K) = 289.95 ± 1.50 kcal/mol	Ruscic W1RO
0.000	2523.4	[CH2CH2]+ (g) → 2 C (g) + 4 H (g)	Δ_rH°(0 K) = 289.20 ± 1.60 kcal/mol	Ruscic G4
0.000	2523.7	[CH2CH2]+ (g) → 2 C (g) + 4 H (g)	Δ_rH°(0 K) = 288.55 ± 1.60 kcal/mol	Ruscic CBS-n
0.000	2523.3	[CH2CH2]+ (g) → 2 C (g) + 4 H (g)	Δ_rH°(0 K) = 289.15 ± 1.72 kcal/mol	Ruscic G3X
0.000	2517.7	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 10.515 ± 0.003 eV	Masclet 1973
0.000	2520.11	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 242.364 ± 0.085 kcal/mol	Feller 2017a
0.000	2517.4	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 10.517 ± 0.002 (×2.181) eV	Stockbauer 1975
0.000	2517.5	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 10.517 ± 0.003 (×1.477) eV	Stockbauer 1975a
0.000	2517.8	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 10.511 ± 0.005 eV	Brehm 1966
0.000	2517.2	CH2CH2 (g) → [CH2CH2]+ (g)	Δ_rH°(0 K) = 10.514 ± 0.005 eV	Dehmer 1979, est unc

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. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument, Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
5		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]
6		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]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
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.