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Methanethiol

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Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

Fluorine anion + Methanethiol = (Fluorine anion bullet Methanethiol)

By formula: F- + CH4S = (F- bullet CH4S)

Quantity Value Units Method Reference Comment
Deltar34.2 ± 2.0kcal/molIMRELarson and McMahon, 1983gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M
Quantity Value Units Method Reference Comment
Deltar23.2cal/mol*KN/ALarson and McMahon, 1983gas phase; switching reaction(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M
Quantity Value Units Method Reference Comment
Deltar27.3 ± 2.0kcal/molIMRELarson and McMahon, 1983gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M

MeS anion + Hydrogen cation = Methanethiol

By formula: CH3S- + H+ = CH4S

Quantity Value Units Method Reference Comment
Deltar357.6 ± 2.0kcal/molD-EASchwartz, Davico, et al., 2000gas phase; B
Deltar357.5 ± 2.0kcal/molD-EAMoran and Ellison, 1988gas phase; B
Deltar356.9 ± 2.2kcal/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Quantity Value Units Method Reference Comment
Deltar350.6 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

CH3S- + Hydrogen cation = Methanethiol

By formula: CH3S- + H+ = CH4S

Quantity Value Units Method Reference Comment
Deltar395.3 ± 2.6kcal/molG+TSKass, Guo, et al., 1990gas phase; Acidity between D2O and Me2NH.; B
Deltar391.6 ± 7.7kcal/molD-EAKass, Guo, et al., 1990gas phase; Between O2 and SO2. Explains bad anchor in McIver Jr. and Fukuda, 1982; B
Quantity Value Units Method Reference Comment
Deltar388.2 ± 2.5kcal/molIMRBKass, Guo, et al., 1990gas phase; Acidity between D2O and Me2NH.; B

(CH6N+ bullet 2Acetonitrile) + Methanethiol = (CH6N+ bullet Methanethiol bullet 2Acetonitrile)

By formula: (CH6N+ bullet 2C2H3N) + CH4S = (CH6N+ bullet CH4S bullet 2C2H3N)

Quantity Value Units Method Reference Comment
Deltar7.8kcal/molPHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar20.cal/mol*KN/AMeot-Ner (Mautner) and Sieck, 1985gas phase; Entropy change calculated or estimated; M

Free energy of reaction

DeltarG° (kcal/mol) T (K) Method Reference Comment
2.4270.PHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; Entropy change calculated or estimated; M

Chlorine anion + Methanethiol = (Chlorine anion bullet Methanethiol)

By formula: Cl- + CH4S = (Cl- bullet CH4S)

Quantity Value Units Method Reference Comment
Deltar15.5 ± 3.0kcal/molIMRBStaneke, Groothuis, et al., 1995gas phase; Chloride affinity comparable to that of CHCl3; B
Quantity Value Units Method Reference Comment
Deltar10.8 ± 3.0kcal/molIMRBStaneke, Groothuis, et al., 1995gas phase; Chloride affinity comparable to that of CHCl3; B

MeCO2 anion + Methanethiol = (MeCO2 anion bullet Methanethiol)

By formula: C2H3O2- + CH4S = (C2H3O2- bullet CH4S)

Quantity Value Units Method Reference Comment
Deltar14.9 ± 1.0kcal/molTDAsMeot-ner, 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar22.8cal/mol*KPHPMSMeot-ner, 1988gas phase; M
Quantity Value Units Method Reference Comment
Deltar8.1 ± 1.0kcal/molTDAsMeot-ner, 1988gas phase; B

(CH6N+ bullet Acetonitrile) + Methanethiol = (CH6N+ bullet Methanethiol bullet Acetonitrile)

By formula: (CH6N+ bullet C2H3N) + CH4S = (CH6N+ bullet CH4S bullet C2H3N)

Quantity Value Units Method Reference Comment
Deltar9.9kcal/molPHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; M
Quantity Value Units Method Reference Comment
Deltar20.0cal/mol*KPHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; M

CH6N+ + Methanethiol = (CH6N+ bullet Methanethiol)

By formula: CH6N+ + CH4S = (CH6N+ bullet CH4S)

Quantity Value Units Method Reference Comment
Deltar13.4kcal/molPHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; M
Quantity Value Units Method Reference Comment
Deltar22.1cal/mol*KPHPMSMeot-Ner (Mautner) and Sieck, 1985gas phase; M

Hydrogen iodide + Methylsulfenyliodide = Methanethiol + Iodine

By formula: HI + CH3IS = CH4S + I2

Quantity Value Units Method Reference Comment
Deltar-2.88 ± 0.54kcal/molEqkShum and Benson, 1983gas phase; ALS

References

Go To: Top, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Larson and McMahon, 1983
Larson, J.W.; McMahon, T.B., Strong hydrogen bonding in gas-phase anions. An ion cyclotron resonance determination of fluoride binding energetics to bronsted acids from gas-phase fluoride exchange equilibria measurements, J. Am. Chem. Soc., 1983, 105, 2944. [all data]

Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R., Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study, J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034 . [all data]

Arshadi, Yamdagni, et al., 1970
Arshadi, M.; Yamdagni, R.; Kebarle, P., Hydration of Halide Negative Ions in the Gas Phase. II. Comparison of Hydration Energies for the Alkali Positive and Halide Negative Ions, J. Phys. Chem., 1970, 74, 7, 1475, https://doi.org/10.1021/j100702a014 . [all data]

Schwartz, Davico, et al., 2000
Schwartz, R.L.; Davico, G.E.; Lineberger, W.C., Negative-ion photoelectron spectroscopy of CH3S-, J. Electron Spectros. Rel. Phenom., 2000, 108, 1-3, 163-168, https://doi.org/10.1016/S0368-2048(00)00125-0 . [all data]

Moran and Ellison, 1988
Moran, S.; Ellison, G.B., Photoelectron Spectroscopy of Sulfur Ions, J. Phys. Chem., 1988, 92, 7, 1794, https://doi.org/10.1021/j100318a021 . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Kass, Guo, et al., 1990
Kass, S.R.; Guo, H.-Z.; Dahlke, G.D., The Thiomethyl Anion: Formation, Reactivity, and Thermodynamic Properties, J. Am. Soc. Mass Spectrom., 1990, 1, 5, 366, https://doi.org/10.1016/1044-0305(90)85016-F . [all data]

McIver Jr. and Fukuda, 1982
McIver Jr.; Fukuda, E.K., Equilibrium Electron Affinities, Lec. Notes in Chem., 1982, 31, 165. [all data]

Meot-Ner (Mautner) and Sieck, 1985
Meot-Ner (Mautner), M.; Sieck, L.W., The Ionic Hydrogen Bond and Ion Solvation. 4. SH+ O and NH+ S Bonds. Correlations with Proton Affinity. Mutual Effects of Weak and Strong Ligands in Mixed Clusters, J. Phys. Chem., 1985, 89, 24, 5222, https://doi.org/10.1021/j100270a021 . [all data]

Staneke, Groothuis, et al., 1995
Staneke, P.O.; Groothuis, G.; Ingemann, S.; Nibbering, N.M.M., Formation, stability and structure of radical anions of chloroform, tetrachloromethane and fluorotrichloromethane in the gas phase, Int. J. Mass Spectrom. Ion Proc., 1995, 142, 1-2, 83, https://doi.org/10.1016/0168-1176(94)04127-S . [all data]

Meot-ner, 1988
Meot-ner, M., Ionic Hydrogen Bond and Ion Solvation. 6. Interaction Energies of the Acetate Ion with Organic Molecules. Comparison of CH3COO- with Cl-, CN-, and SH-, J. Am. Chem. Soc., 1988, 110, 12, 3854, https://doi.org/10.1021/ja00220a022 . [all data]

Shum and Benson, 1983
Shum, L.G.S.; Benson, S.W., Thermochemnistry and kinetics of the reaction of methyl mercaptan with iodine, Int. J. Chem. Kinet., 1983, 15, 433-453. [all data]


Notes

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