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].

Methanethiol

Formula: CH3SH (cr,l)
CAS RN: 74-93-1
ATcT ID: 74-93-1*500
SMILES: CS
InChI: InChI=1S/CH4S/c1-2/h2H,1H3
InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N
Hills Formula: C1H4S1

2D Image:

CS
Aliases: CH3SH; Methanethiol; Mercaptomethane; Methyl mercaptane; Methyl sulfhydrate; Methyl thioalcohol; UN 1064
Relative Molecular Mass: 48.1085 ± 0.0061

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
-46.76-44.57± 0.44kJ/mol

Top contributors to the provenance of ΔfH° of CH3SH (cr,l)

The 15 contributors listed below account for 90.0% of the provenance of ΔfH° of CH3SH (cr,l).

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
63.89738.1 CH3SH (cr,l) + 7/2 O2 (g) → CO2 (g) H2O (cr,l) OS(O)(OH)2 (aq, 30 H2O) ΔrH°(298.15 K) = -363.49 ± 0.12 kcal/molGood 1961, Good 1961
4.09763.4 CH3SCH3 (g) H2S (g) → 2 CH3SH (g) ΔrH°(0 K) = 3.52 ± 0.85 kcal/molRuscic W1RO
3.59763.2 CH3SCH3 (g) H2S (g) → 2 CH3SH (g) ΔrH°(0 K) = 3.54 ± 0.90 kcal/molRuscic G4
3.59763.1 CH3SCH3 (g) H2S (g) → 2 CH3SH (g) ΔrH°(0 K) = 3.60 ± 0.90 kcal/molRuscic G3X
2.99763.3 CH3SCH3 (g) H2S (g) → 2 CH3SH (g) ΔrH°(0 K) = 3.62 ± 1.00 kcal/molRuscic CBS-n
2.49369.1 S (cr,l) O2 (g) → OSO (g) ΔrH°(298.15 K) = -296.847 ± 0.200 kJ/molEckman 1929, note SO2
1.79516.1 S (cr,l) + 3/2 O2 (g) H2O (cr,l) → OS(O)(OH)2 (aq, 115 H2O) ΔrH°(298.15 K) = -143.85 ± 0.06 kcal/molGood 1960, CODATA Key Vals
1.69739.1 CH3SH (cr,l) → CH3SH (g) ΔrH°(298.15 K) = 24.01 ± 0.25 kJ/molThermoData 2004
1.29516.2 S (cr,l) + 3/2 O2 (g) H2O (cr,l) → OS(O)(OH)2 (aq, 115 H2O) ΔrH°(298.15 K) = -143.92 ± 0.07 kcal/molMansson 1963, CODATA Key Vals
0.99736.4 CH3SH (g) H2O (g) → CH3OH (g) H2S (g) ΔrH°(0 K) = 10.43 ± 0.9 kcal/molRuscic W1RO
0.99757.4 CH3CH2SH (g) CH3CH3 (g) → CH3SH (g) CH3CH2CH3 (g) ΔrH°(0 K) = 0.89 ± 0.85 kcal/molRuscic W1RO
0.89758.4 CH3CH2SH (g) CH3OH (g) → CH3SH (g) CH3CH2OH (g) ΔrH°(0 K) = -2.15 ± 0.85 kcal/molRuscic W1RO
0.89757.2 CH3CH2SH (g) CH3CH3 (g) → CH3SH (g) CH3CH2CH3 (g) ΔrH°(0 K) = 0.97 ± 0.90 kcal/molRuscic G4
0.89757.1 CH3CH2SH (g) CH3CH3 (g) → CH3SH (g) CH3CH2CH3 (g) ΔrH°(0 K) = 1.09 ± 0.90 kcal/molRuscic G3X
0.79758.1 CH3CH2SH (g) CH3OH (g) → CH3SH (g) CH3CH2OH (g) ΔrH°(0 K) = -2.10 ± 0.90 kcal/molRuscic G3X

Top 10 species with enthalpies of formation correlated to the ΔfH° of CH3SH (cr,l)

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
89.1 MethanethiolCH3SH (g)CS-10.39-20.66± 0.46kJ/mol48.1085 ±
0.0061
74-93-1*0
88.4 Methanethiol cation[CH3SH]+ (g)[CH3+]S901.89891.85± 0.46kJ/mol48.1079 ±
0.0061
53369-41-8*0
28.2 Sulfuric acidOS(O)(OH)2 (aq, 30 H2O)OS(=O)(=O)O-885.87± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*820
28.2 Sulfuric acidOS(O)(OH)2 (aq, 100 H2O)OS(=O)(=O)O-887.53± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*828
28.2 Sulfuric acidOS(O)(OH)2 (aq, 40 H2O)OS(=O)(=O)O-886.35± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*821
28.2 Sulfuric acidOS(O)(OH)2 (aq, 75 H2O)OS(=O)(=O)O-887.18± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*825
28.2 Sulfuric acidOS(O)(OH)2 (aq, 50 H2O)OS(=O)(=O)O-886.66± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*822
28.2 Sulfuric acidOS(O)(OH)2 (aq, 1000 H2O)OS(=O)(=O)O-892.23± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*839
28.2 Sulfuric acidOS(O)(OH)2 (aq, 800 H2O)OS(=O)(=O)O-891.62± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*837
28.2 Sulfuric acidOS(O)(OH)2 (aq, 700 H2O)OS(=O)(=O)O-891.25± 0.13kJ/mol98.0795 ±
0.0061
7664-93-9*835

Most Influential reactions involving CH3SH (cr,l)

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
0.6999738.1 CH3SH (cr,l) + 7/2 O2 (g) → CO2 (g) H2O (cr,l) OS(O)(OH)2 (aq, 30 H2O) ΔrH°(298.15 K) = -363.49 ± 0.12 kcal/molGood 1961, Good 1961
0.6969739.1 CH3SH (cr,l) → CH3SH (g) ΔrH°(298.15 K) = 24.01 ± 0.25 kJ/molThermoData 2004
0.2489739.2 CH3SH (cr,l) → CH3SH (g) ΔrH°(279.12 K) = 5.872 ± 0.10 kcal/molRussell 1942, Good 1961, Good 1961, 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 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. 1.172 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.