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].

Methanide

Formula: [CH3]- (g)
CAS RN: 15194-58-8
ATcT ID: 15194-58-8*0
SMILES: [CH3-]
InChI: InChI=1S/CH3/h1H3/q-1
InChIKey: LGRLWUINFJPLSH-UHFFFAOYSA-N
Hills Formula: C1H3-

2D Image:

[CH3-]
Aliases: [CH3]-; Methanide; Methide; Methyl carbanion; Methyl anion; Methyl ion (1-); Methide anion
Relative Molecular Mass: 15.03507 ± 0.00083

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
141.15137.71± 0.24kJ/mol

3D Image of [CH3]- (g)

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Top contributors to the provenance of ΔfH° of [CH3]- (g)

The 5 contributors listed below account for 92.2% of the provenance of ΔfH° of [CH3]- (g).

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
62.72393.1 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.093 ± 0.003 eVOliveira 2015
8.82393.14 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.093 ± 0.008 eVFeller 2016, note unc2
7.82397.1 [CH3]- (g) → C- (g) + 3 H (g) ΔrH°(0 K) = 262.0 ± 0.2 kcal/molFeller 2016, note unc2
7.12435.1 [CH3]- (g) → [CH2]- (g) H (g) ΔrH°(0 K) = 96.3 ± 0.2 kcal/molFeller 2016, est unc, note unc2
5.62393.13 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.094 ± 0.010 eVOliveira 2015

Top 10 species with enthalpies of formation correlated to the ΔfH° of [CH3]- (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
18.4 MethylCH3 (g)[CH3]149.876146.476± 0.049kJ/mol15.03452 ±
0.00083
2229-07-4*0
16.5 Methylium[CH3]+ (g)[CH3+]1099.3491095.405± 0.045kJ/mol15.03397 ±
0.00083
14531-53-4*0
15.9 MethaneCH4 (g)C-66.547-74.516± 0.043kJ/mol16.04246 ±
0.00085
74-82-8*0
12.2 Methane cation[CH4]+ (g)[CH4+]1150.6831144.300± 0.057kJ/mol16.04191 ±
0.00085
20741-88-2*0
11.3 MethaneCH4 (aq, undissoc)C-87.699± 0.061kJ/mol16.04246 ±
0.00085
74-82-8*1000
8.3 CarbonC (g, singlet)[C]833.312838.459± 0.039kJ/mol12.01070 ±
0.00080
7440-44-0*2
8.3 Carbon cationC+ (g)[C+]1797.8341803.432± 0.039kJ/mol12.01015 ±
0.00080
14067-05-1*0
8.3 CarbonC (g, triplet)[C]711.381716.866± 0.039kJ/mol12.01070 ±
0.00080
7440-44-0*1
8.3 CarbonC (g)[C]711.381716.866± 0.039kJ/mol12.01070 ±
0.00080
7440-44-0*0
8.3 CarbonC (g, quintuplet)[C]1114.9441120.091± 0.039kJ/mol12.01070 ±
0.00080
7440-44-0*3

Most Influential reactions involving [CH3]- (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
0.6552393.1 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.093 ± 0.003 eVOliveira 2015
0.1162435.1 [CH3]- (g) → [CH2]- (g) H (g) ΔrH°(0 K) = 96.3 ± 0.2 kcal/molFeller 2016, est unc, note unc2
0.0922393.14 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.093 ± 0.008 eVFeller 2016, note unc2
0.0812397.1 [CH3]- (g) → C- (g) + 3 H (g) ΔrH°(0 K) = 262.0 ± 0.2 kcal/molFeller 2016, note unc2
0.0733274.1 [CH3CH2CH2]- (g) CH4 (g) → CH3CH2CH3 (g) [CH3]- (g) ΔrH°(298.15 K) = 1.0 ± 1.0 kcal/molDePuy 1989
0.0713440.6 CH2(CH2CH2) (g) [CH3]- (g) → [CH(CH2CH2)]- (g) CH4 (g) ΔrH°(0 K) = -4.16 ± 0.8 (×1.215) kcal/molRuscic W1RO
0.0592393.13 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 0.094 ± 0.010 eVOliveira 2015
0.0442511.1 [CH3CH2]- (g) CH4 (g) → [CH3]- (g) CH3CH3 (g) ΔrH°(298.15 K) = -3.5 ± 1.0 kcal/molDePuy 1989
0.0223440.5 CH2(CH2CH2) (g) [CH3]- (g) → [CH(CH2CH2)]- (g) CH4 (g) ΔrH°(0 K) = -4.89 ± 1.0 (×1.719) kcal/molRuscic CBS-n
0.0172511.5 [CH3CH2]- (g) CH4 (g) → [CH3]- (g) CH3CH3 (g) ΔrH°(0 K) = -2.30 ± 0.9 (×1.756) kcal/molRuscic W1RO
0.0163440.1 CH2(CH2CH2) (g) [CH3]- (g) → [CH(CH2CH2)]- (g) CH4 (g) ΔrH°(298.15 K) = -5.1 ± 2. kcal/molDePuy 1989, DePuy 1984, note unc
0.0152511.4 [CH3CH2]- (g) CH4 (g) → [CH3]- (g) CH3CH3 (g) ΔrH°(0 K) = -2.19 ± 1.0 (×1.682) kcal/molRuscic CBS-n
0.0152512.5 [CH3CH2]- (g) CH3 (g) → CH3CH2 (g) [CH3]- (g) ΔrH°(0 K) = -0.265 ± 0.039 (×1.915) eVRuscic W1RO
0.0152393.15 [CH3]- (g) → CH3 (g) ΔrH°(0 K) = 1.64 ± 0.3 (×1.509) kcal/molDixon 1997
0.0122512.4 [CH3CH2]- (g) CH3 (g) → CH3CH2 (g) [CH3]- (g) ΔrH°(0 K) = -0.255 ± 0.043 (×1.957) eVRuscic CBS-n
0.0093440.4 CH2(CH2CH2) (g) [CH3]- (g) → [CH(CH2CH2)]- (g) CH4 (g) ΔrH°(0 K) = -5.82 ± 1.3 (×2.044) kcal/molRuscic CBS-n
0.0073440.3 CH2(CH2CH2) (g) [CH3]- (g) → [CH(CH2CH2)]- (g) CH4 (g) ΔrH°(0 K) = -6.10 ± 1.0 (×2.954) kcal/molRuscic G4
0.0072512.3 [CH3CH2]- (g) CH3 (g) → CH3CH2 (g) [CH3]- (g) ΔrH°(0 K) = -0.232 ± 0.056 (×1.915) eVRuscic CBS-n
0.0062512.2 [CH3CH2]- (g) CH3 (g) → CH3CH2 (g) [CH3]- (g) ΔrH°(0 K) = -0.229 ± 0.043 (×2.594) eVRuscic G4
0.0062511.3 [CH3CH2]- (g) CH4 (g) → [CH3]- (g) CH3CH3 (g) ΔrH°(0 K) = -1.32 ± 1.0 (×2.538) kcal/molRuscic G4


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. 1.176 of the Thermochemical Network (2024); available at ATcT.anl.gov
4   T. L. Nguyen et al, ongoing studies (2024)
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.