Selected ATcT [1, 2] enthalpy of formation based on version 1.156 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.148 to include species relevant to a recent study of the oxidation of ethylene [4] as well as new measurements that led to refining the thermochemistry of CF and SiF and their cations [5].

Vinylidene anion

Formula: [CCH2]- (g)
CAS RN: 66295-36-1
ATcT ID: 66295-36-1*0
SMILES: [C-]=C
InChI: InChI=1S/C2H2/c1-2/h1H2/q-1
InChIKey: VSVANFQZMKLBSU-UHFFFAOYSA-N
Hills Formula: C2H2-

2D Image:

[C-]=C
Aliases: [CCH2]-; Vinylidene anion; Vinylidene ion (1-); Ethenylidene anion; Ethenylidene ion (1-); Methylenecarbene anion; Methylenecarbene ion (1-); Methylidenecarbene anion; Methylidenecarbene ion (1-); CCH2-; [CH2C]-; CH2C-; [H2CC]-; H2CC-
Relative Molecular Mass: 26.0378 ± 0.0016

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
364.28364.09± 0.31kJ/mol

3D Image of [CCH2]- (g)

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Top contributors to the provenance of ΔfH° of [CCH2]- (g)

The 20 contributors listed below account only for 75.2% of the provenance of ΔfH° of [CCH2]- (g).
A total of 116 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
15.82608.1 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 43.53 ± 0.15 kcal/molLee 2013
5.72600.1 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.4866 ± 0.0008 eVDeVine 2017
5.72608.4 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 43.62 ± 0.25 kcal/molKarton 2011
5.72608.5 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 43.62 ± 0.25 kcal/molKarton 2006, Karton 2008
4.52598.12 CCH2 (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 345.10 ± 0.30 kcal/molKarton 2008
4.52598.11 CCH2 (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 345.10 ± 0.30 kcal/molKarton 2011
4.42610.9 CH2CH2 (g) → CCH2 (g) H2 (g) ΔrH°(0 K) = 83.71 ± 0.30 kcal/molKarton 2011
4.02609.12 CCH2 (g) → CCH (g) H (g) ΔrH°(0 K) = 88.02 ± 0.30 kcal/molKarton 2011
3.42549.9 CH2CH (g) → CCH2 (g) H (g) ΔrH°(0 K) = 77.96 ± 0.30 kcal/molKarton 2008
3.42549.8 CH2CH (g) → CCH2 (g) H (g) ΔrH°(0 K) = 77.96 ± 0.30 kcal/molKarton 2011
3.12610.11 CH2CH2 (g) → CCH2 (g) H2 (g) ΔrH°(0 K) = 350.63 ± 1.5 kJ/molKlippenstein 2017
2.82609.13 CCH2 (g) → CCH (g) H (g) ΔrH°(0 K) = 368.45 ± 1.5 kJ/molKlippenstein 2017
2.72607.10 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 182.22 ± 1.5 kJ/molKlippenstein 2017
2.22608.3 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 43.59 ± 0.40 kcal/molKarton 2011
1.22598.10 CCH2 (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 344.97 ± 0.56 kcal/molKarton 2011
1.22610.8 CH2CH2 (g) → CCH2 (g) H2 (g) ΔrH°(0 K) = 83.78 ± 0.56 kcal/molKarton 2011
1.12609.11 CCH2 (g) → CCH (g) H (g) ΔrH°(0 K) = 88.08 ± 0.56 kcal/molKarton 2011
1.07587.6 CH2CCHO (g) → CCH2 (g) HCO (g) ΔrH°(0 K) = 274.15 ± 2.0 kJ/molKlippenstein 2017
1.02608.6 HCCH (g) → CCH2 (g) ΔrH°(0 K) = 15199 ± 205 cm-1Stanton 1999
0.92549.7 CH2CH (g) → CCH2 (g) H (g) ΔrH°(0 K) = 78.01 ± 0.56 kcal/molKarton 2011

Top 10 species with enthalpies of formation correlated to the ΔfH° of [CCH2]- (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 Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
96.8 VinylideneCCH2 (g)[C]=C411.24412.15± 0.30kJ/mol26.0373 ±
0.0016
2143-69-3*0
75.8 VinylideneCCH2 (g, triplet)[C]=C610.65610.36± 0.39kJ/mol26.0373 ±
0.0016
2143-69-3*1
28.9 AcetyleneHCCH (g)C#C228.89228.33± 0.12kJ/mol26.0373 ±
0.0016
74-86-2*0
28.9 Acetylene cation[HCCH]+ (g)C#[CH+]1328.901328.24± 0.12kJ/mol26.0367 ±
0.0016
25641-79-6*0
22.9 Ethynylium[CCH]+ (g)C#[C+]1687.641690.98± 0.15kJ/mol25.0288 ±
0.0016
16456-59-0*0
22.7 EthynylCCH (g)C#[C]563.77567.88± 0.15kJ/mol25.0293 ±
0.0016
2122-48-7*0
21.7 CarbonC (g)[C]711.400716.885± 0.040kJ/mol12.01070 ±
0.00080
7440-44-0*0
21.7 CarbonC (g, triplet)[C]711.400716.885± 0.040kJ/mol12.01070 ±
0.00080
7440-44-0*1
21.7 Carbon cationC+ (g)[C+]1797.8531803.451± 0.040kJ/mol12.01015 ±
0.00080
14067-05-1*0
21.7 CarbonC (g, quintuplet)[C]1114.9631120.109± 0.040kJ/mol12.01070 ±
0.00080
7440-44-0*3

Most Influential reactions involving [CCH2]- (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
0.9632600.1 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.4866 ± 0.0008 eVDeVine 2017
0.7822605.1 [CCH2]- (g) → CCH2 (g, triplet) ΔrH°(0 K) = 20602 ± 24 cm-1DeVine 2016, note unc
0.0172600.2 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.490 ± 0.006 eVErvin 1990, Ervin 1989
0.0022602.8 [CCH2]- (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 356.35 ± 1.50 kcal/molRuscic W1RO
0.0022602.4 [CCH2]- (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 357.48 ± 1.60 kcal/molRuscic G4
0.0022602.7 [CCH2]- (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 355.70 ± 1.60 kcal/molRuscic CBS-n
0.0012602.3 [CCH2]- (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 356.92 ± 1.72 kcal/molRuscic G3X
0.0012600.4 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.47 ± 0.02 eVBurnett 1983
0.0012602.6 [CCH2]- (g) → 2 C (g) + 2 H (g) ΔrH°(0 K) = 355.09 ± 2.16 kcal/molRuscic CBS-n
0.0012600.3 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.484 ± 0.025 eVGerardi 2010, est unc
0.0002611.2 [CCH2]- (g) H2O (g) → CH2CH (g) [OH]- (g) ΔrG°(298.15 K) = 6 ± 3 (×1.022) kcal/molGuo 1990
0.0002612.1 [CCH2]- (g) CH3OH (g) → CH2CH (g) [CH3O]- (g) ΔrG°(298.15 K) = -2.3 ± 2.3 (×1.682) kcal/molErvin 1990, Ervin 2002, DeTuri 1999
0.0002611.1 [CCH2]- (g) H2O (g) → CH2CH (g) [OH]- (g) ΔrG°(298.15 K) = 5.8 ± 2.3 (×1.414) kcal/molErvin 1990, Ervin 2002, DeTuri 1999
0.0002612.2 [CCH2]- (g) CH3OH (g) → CH2CH (g) [CH3O]- (g) ΔrG°(298.15 K) = -3 ± 3 (×1.509) kcal/molGuo 1990
0.0002600.12 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.495 ± 0.050 eVRuscic W1RO
0.0002600.8 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.527 ± 0.061 eVRuscic G4
0.0002600.7 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.499 ± 0.085 eVRuscic G3X
0.0002600.11 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.506 ± 0.090 eVRuscic CBS-n
0.0002600.10 [CCH2]- (g) → CCH2 (g) ΔrH°(0 K) = 0.496 ± 0.092 eVRuscic CBS-n


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 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. 1.156 of the Thermochemical Network (2024); available at ATcT.anl.gov
4   N. A. Seifert, B. Ruscic, R. Sivaramakrishnan, and K. Prozument,
The C2H4O Isomers in the Oxidation of Ethylene
J. Mol. Spectrosc. 398, 111847/1-8 (2023) [DOI: 10.1016/j.jms.2023.111847]
5   U. Jacovella, B. Ruscic, N. L. Chen, H.-L. Le, S. Boyé-Péronne, S. Hartweg, M. Roy-Chowdhury, G. A. Garcia, J.-C. Loison, and B. Gans,
Refining Thermochemical Properties of CF, SiF, and Their Cations by Combining Photoelectron Spectroscopy, Quantum Chemical Calculations, and the Active Thermochemical Tables Approach
Phys. Chem. Chem. Phys. 25, 30838-30847 (2023) [DOI: 10.1039/D3CP04244H]
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]
7   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 [6] and Ruscic and Bross[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.