Selected ATcT [1, 2] enthalpy of formation based on version 1.122g of the Thermochemical Network [3]

This version of ATcT results was generated from an expansion of version 1.122e [4] to include results centered on the determination of the appearance energy of CH3+ from CH4. [5].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass		 ATcT ID
Ethanium[C2H7]+ (g, bridged C2)[CH3+][H][CH3]874.34858.07± 0.62kJ/mol31.0764 ±
0.0017		24669-33-8*1

Representative Geometry of [C2H7]+ (g, bridged C2)

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Top contributors to the provenance of ΔfH° of [C2H7]+ (g, bridged C2)

The 20 contributors listed below account only for 73.8% of the provenance of ΔfH° of [C2H7]+ (g, bridged C2).
A total of 47 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
21.51991.3 [C2H7]+ (g) + CO (g) → [HCO]+ (g) + CH3CH3 (g) ΔrG°(298.15 K) = 1.43 ± 0.3 kcal/molMackay 1981, 3rd Law, note unc5
11.11989.2 [C2H7]+ (g) → [CH3CH2]+ (g) + H2 (g) ΔrG°(405 K) = 1.65 ± 0.4 kcal/molHiraoka 1976, 3rd Law
3.91991.2 [C2H7]+ (g) + CO (g) → [HCO]+ (g) + CH3CH3 (g) ΔrG°(337 K) = 1.7 ± 0.7 kcal/molSzulejko 1993, 3rd Law, note unc5
3.51992.2 [C2H7]+ (g) + CH2CH2 (g) → [CH3CH2]+ (g) + CH3CH3 (g) ΔrG°(373 K) = -19.5 ± 0.7 kcal/molSzulejko 1993, 3rd Law, note unc5
3.31990.2 [C2H7]+ (g) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrG°(334 K) = 10.5 ± 0.7 kcal/molSzulejko 1993, 3rd Law, note unc5
3.01986.5 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.04 ± 0.8 kcal/molRuscic W1RO
3.01985.5 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.50 ± 0.8 kcal/molRuscic W1RO
2.51984.5 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 10.71 ± 0.8 kcal/molRuscic W1RO
2.41983.7 [C2H7]+ (g, bridged C2) → CH3CH3 (g) + H+ (g) ΔrH°(0 K) = 139.99 ± 0.90 kcal/molRuscic W1RO
2.31989.1 [C2H7]+ (g) → [CH3CH2]+ (g) + H2 (g) ΔrH°(416 K) = 11.8 ± 0.4 (×2.181) kcal/molHiraoka 1976, 2nd Law
1.91986.4 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.36 ± 1.0 kcal/molRuscic CBS-n
1.91986.2 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.61 ± 1.0 kcal/molRuscic G4
1.91985.4 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.42 ± 1.0 kcal/molRuscic CBS-n
1.91985.2 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.55 ± 1.0 kcal/molRuscic G4
1.71989.5 [C2H7]+ (g) → [CH3CH2]+ (g) + H2 (g) ΔrG°(375 K) = 2.5 ± 1 kcal/molSzulejko 1993, est unc
1.61984.4 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 11.75 ± 1.0 kcal/molRuscic CBS-n
1.61984.2 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 11.24 ± 1.0 kcal/molRuscic G4
1.31986.1 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.66 ± 1.2 kcal/molRuscic G3X
1.31985.1 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.15 ± 1.2 kcal/molRuscic G3X
1.11986.3 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.47 ± 1.3 kcal/molRuscic CBS-n

Top 10 species with enthalpies of formation correlated to the ΔfH° of [C2H7]+ (g, bridged C2)

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 Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass		 ATcT ID
100.0 Ethanium[C2H7]+ (g)[CH3+][H][CH3]874.34858.10± 0.62kJ/mol31.0764 ±
0.0017		24669-33-8*0
22.4 Ethanium[C2H7]+ (g, classical Cs I)[CH3+][H][CH3]888.7870.3± 1.8kJ/mol31.0764 ±
0.0017		24669-33-8*2
20.1 Ethanium[C2H7]+ (g, classical Cs II)[CH3+][H][CH3]895.1877.3± 1.9kJ/mol31.0764 ±
0.0017		24669-33-8*3
18.9 EthaneCH3CH3 (g)CC-68.35-83.97± 0.13kJ/mol30.0690 ±
0.0017		74-84-0*0
18.0 Ethylium[CH3CH2]+ (g)[CH2+]1[CH2][H]1914.84902.76± 0.31kJ/mol29.0606 ±
0.0016		14936-94-8*0
13.9 EthyleneCH2CH2 (g)C=C60.8852.36± 0.12kJ/mol28.0532 ±
0.0016		74-85-1*0
13.9 Ethylene cation[CH2CH2]+ (g)C=[CH2+]1075.201067.98± 0.12kJ/mol28.0526 ±
0.0016		34470-02-5*0
12.4 Methanium[CH5]+ (g)[CH5+]921.95911.70± 0.45kJ/mol17.04985 ±
0.00087		15135-49-6*0
12.0 PropaneCH3CH2CH3 (g)CCC-82.75-105.03± 0.18kJ/mol44.0956 ±
0.0025		74-98-6*0
11.6 Hydroxyoxomethylium[HOCO]+ (g)O[C+]=O600.65597.57± 0.44kJ/mol45.0169 ±
0.0010		638-71-1*0

Most Influential reactions involving [C2H7]+ (g, bridged C2)

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
1.0001988.1 [C2H7]+ (g) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = 0 ± 0 cm-1Ruscic W1RO, Ruscic G4, Ruscic G3B3, Carneiro 1994, East 1998
0.1391981.6 [C2H7]+ (g, classical Cs II) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -4.38 ± 1.2 kcal/molRuscic W1RO
0.1181981.4 [C2H7]+ (g, classical Cs II) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -4.99 ± 1.3 kcal/molRuscic G4
0.1151980.7 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -2.92 ± 1.2 kcal/molRuscic W1RO
0.1021981.3 [C2H7]+ (g, classical Cs II) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -5.30 ± 1.4 kcal/molRuscic G3X
0.0981980.4 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -3.45 ± 1.3 kcal/molRuscic G4
0.0981980.6 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -3.64 ± 1.3 kcal/molRuscic CBS-n
0.0841980.3 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -3.82 ± 1.4 kcal/molRuscic G3X
0.0781981.5 [C2H7]+ (g, classical Cs II) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -5.11 ± 1.6 kcal/molRuscic CBS-n
0.0641980.5 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -3.82 ± 1.6 kcal/molRuscic CBS-n
0.0441984.5 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 10.71 ± 0.8 kcal/molRuscic W1RO
0.0411980.8 [C2H7]+ (g, classical Cs I) → [C2H7]+ (g, bridged C2) ΔrH°(0 K) = -3.0 ± 2 kcal/molCarneiro 1994, est unc
0.0341985.5 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.50 ± 0.8 kcal/molRuscic W1RO
0.0321986.5 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.04 ± 0.8 kcal/molRuscic W1RO
0.0281984.4 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 11.75 ± 1.0 kcal/molRuscic CBS-n
0.0281984.2 [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 11.24 ± 1.0 kcal/molRuscic G4
0.0251983.7 [C2H7]+ (g, bridged C2) → CH3CH3 (g) + H+ (g) ΔrH°(0 K) = 139.99 ± 0.90 kcal/molRuscic W1RO
0.0211985.4 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.42 ± 1.0 kcal/molRuscic CBS-n
0.0211985.2 [C2H7]+ (g, bridged C2) + H2O (g) → [H3O]+ (g) + CH3CH3 (g) ΔrH°(0 K) = -23.55 ± 1.0 kcal/molRuscic G4
0.0201986.2 [C2H7]+ (g, bridged C2) + H2 (g) → [H3]+ (g) + CH3CH3 (g) ΔrH°(0 K) = 40.61 ± 1.0 kcal/molRuscic G4
References (for your convenience, also available in RIS and BibTex format)
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 21st 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. 1.122g of the Thermochemical Network (2019); available at ATcT.anl.gov
4   J. P. Porterfield, D. H. Bross, B. Ruscic, J. H. Thorpe, T. L. Nguyen, J. H. Baraban, J. F. Stanton, J. W. Daily, and G. B. Ellison,
Thermal Decomposition of Potential Ester Biofuels, Part I: Methyl Acetate and Methyl Butanoate.
J. Chem. Phys. A 121, 4658-4677 (2017) [DOI: 10.1021/acs.jpca.7b02639] (Veronica Vaida Festschrift)
5   Y.-C. Chang, B. Xiong, D. H. Bross, B. Ruscic, and C. Y. Ng,
A Vacuum Ultraviolet laser Pulsed Field Ionization-Photoion Study of Methane (CH4): Determination of the Appearance Energy of Methylium From Methane with Unprecedented Precision and the Resulting Impact on the Bond Dissociation Energies of CH4 and CH4+.
Phys. Chem. Chem. Phys. 19, 9592-9605 (2017) [DOI: 10.1039/c6cp08200a] (part of 2017 PCCP Hot Articles collection)
6   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 [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.