EtO anion


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

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Individual Reactions

C2H5O- + Ethanol = (C2H5O- • Ethanol)

By formula: C2H5O- + C2H6O = (C2H5O- • C2H6O)

Quantity Value Units Method Reference Comment
Δr27.6 ± 1.0kcal/molTDEqMeot-Ner and Sieck, 1986gas phase; B,M
Δr28.1 ± 2.5kcal/molN/ACaldwell, Rozeboom, et al., 1984gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B,M
Quantity Value Units Method Reference Comment
Δr26.8cal/mol*KPHPMSMeot-Ner and Sieck, 1986gas phase; M
Δr29.3cal/mol*KN/ACaldwell, Rozeboom, et al., 1984gas phase; switching reaction(CH3O-)CH3OH; Entropy change calculated or estimated; re-evaluated using Meot-Ner(Mautner), 1986 and Paul and Kebarle, 1990; M
Quantity Value Units Method Reference Comment
Δr19.6 ± 1.6kcal/molTDEqMeot-Ner and Sieck, 1986gas phase; B
Δr19.0 ± 1.6kcal/molIMRECaldwell, Rozeboom, et al., 1984gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B,M
Δr20.1kcal/molICRMcIver, Scott, et al., 1973gas phase; switching reaction(CH3O-)CH3OH, Entropy change calculated or estimated; Meot-Ner (Mautner), 1992; M

C2H5O- + Methyl Alcohol = (C2H5O- • Methyl Alcohol)

By formula: C2H5O- + CH4O = (C2H5O- • CH4O)

Quantity Value Units Method Reference Comment
Δr27.3 ± 2.9kcal/molIMRECaldwell, Rozeboom, et al., 1984gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B,M
Δr25.6 ± 1.9kcal/molCIDTDeTuri and Ervin, 1999gas phase; B
Quantity Value Units Method Reference Comment
Δr29.3cal/mol*KN/ACaldwell, Rozeboom, et al., 1984gas phase; switching reaction(CH3O-)CH3OH, Entropy change calculated or estimated; re-evaluated using Meot-Ner(Mautner), 1986 and Paul and Kebarle, 1990; M
Quantity Value Units Method Reference Comment
Δr18.6 ± 2.0kcal/molIMRECaldwell, Rozeboom, et al., 1984gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B,M

Free energy of reaction

ΔrG° (kcal/mol) T (K) Method Reference Comment
13.4296.FAMackay, Rakshit, et al., 1982gas phase; From thermochemical cycle,switching reaction(CH3O-)CH3OH; Caldwell and Kebarle, 1986, Taft, 1983; M

C2H5O- + Hydrogen cation = Ethanol

By formula: C2H5O- + H+ = C2H6O

Quantity Value Units Method Reference Comment
Δr379.2 ± 1.0kcal/molD-EARamond, Davico, et al., 2000gas phase; B
Δr378.0 ± 2.0kcal/molCIDCHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Δr377.4 ± 2.1kcal/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr379.10 ± 0.10kcal/molCIDTDeTuri and Ervin, 1999gas phase; B
Quantity Value Units Method Reference Comment
Δr372.6 ± 1.1kcal/molH-TSRamond, Davico, et al., 2000gas phase; B
Δr371.4 ± 2.1kcal/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Δr370.8 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

(C2H5O- • 4294967295Acetaldehyde) + Acetaldehyde = C2H5O-

By formula: (C2H5O- • 4294967295C2H4O) + C2H4O = C2H5O-

Quantity Value Units Method Reference Comment
Δr37.7 ± 1.0kcal/molN/ARamond, Davico, et al., 2000gas phase; B
Δr39.5 ± 2.2kcal/molTherBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

C2H5O- + Fluoroform = C3H6F3O-

By formula: C2H5O- + CHF3 = C3H6F3O-

Quantity Value Units Method Reference Comment
Δr22.0 ± 1.0kcal/molIMREChabinyc and Brauman, 1998gas phase; B
Quantity Value Units Method Reference Comment
Δr15.1 ± 1.0kcal/molIMREChabinyc and Brauman, 1998gas phase; B

Gas phase ion energetics 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 by: John E. Bartmess

Electron affinity of neutral species

EAneutral (eV) Method Reference Comment
1.7120 ± 0.0040LPESRamond, Davico, et al., 2000 
1.7150 ± 0.0070LPESDang, Motell, et al., 1993 
1.726 ± 0.033LPESEllison, Engleking, et al., 1982 
1.79 ± 0.10D-EABartmess, Scott, et al., 1979value altered from reference due to change in acidity scale
1.68 ± 0.10EIAEWilliams and Hamill, 1968From EtONO
>1.7EIAETrepka and Neuert, 1963From EtOH
0.589753SIPage and Goode, 1969The Magnetron method, lacking mass analysis, is not considered reliable.

Protonation reactions

C2H5O- + Hydrogen cation = Ethanol

By formula: C2H5O- + H+ = C2H6O

Quantity Value Units Method Reference Comment
Δr379.2 ± 1.0kcal/molD-EARamond, Davico, et al., 2000gas phase
Δr378.0 ± 2.0kcal/molCIDCHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.
Δr377.4 ± 2.1kcal/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale
Δr379.10 ± 0.10kcal/molCIDTDeTuri and Ervin, 1999gas phase
Quantity Value Units Method Reference Comment
Δr372.6 ± 1.1kcal/molH-TSRamond, Davico, et al., 2000gas phase
Δr371.4 ± 2.1kcal/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.
Δr370.8 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Notes

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

Meot-Ner and Sieck, 1986
Meot-Ner, M.; Sieck, L.W., The ionic hydrogen bond and ion solvation. 5. OH...O- bonds. Gas phase solvation and clustering of alkoxide and carboxylate anions, J. Am. Chem. Soc., 1986, 108, 7525. [all data]

Caldwell, Rozeboom, et al., 1984
Caldwell, G.; Rozeboom, M.D.; Kiplinger, J.P.; Bartmess, J.E., Anion-alcohol hydrogen bond strengths in the gas phase, J. Am. Chem. Soc., 1984, 106, 4660. [all data]

Paul and Kebarle, 1990
Paul, G.J.C.; Kebarle, P., Thermodynamics of the Association Reactions OH- - H2O = HOHOH- and CH3O- - CH3OH = CH3OHOCH3- in the Gas Phase, J. Phys. Chem., 1990, 94, 12, 5184, https://doi.org/10.1021/j100375a076 . [all data]

Meot-ner and Sieck, 1986
Meot-ner, M.; Sieck, L.W., Relative acidities of water and methanol, and the stabilities of the dimer adducts, J. Phys. Chem., 1986, 90, 6687. [all data]

Meot-Ner(Mautner), 1986
Meot-Ner(Mautner), M., Comparative Stabilities of Cationic and Anionic Hydrogen-Bonded Networks. Mixed Clusters of Water-Methanol, J. Am. Chem. Soc., 1986, 108, 20, 6189, https://doi.org/10.1021/ja00280a014 . [all data]

McIver, Scott, et al., 1973
McIver, R.T., Jr.; Scott, J.A.; Riveros, J.M., Effect of solvation on the intrinsic relative acidity of methanol and ethanol, J. Am. Chem. Soc., 1973, 95, 2706. [all data]

Meot-Ner (Mautner), 1992
Meot-Ner (Mautner), M., Intermolecular Forces in Organic Clusters, J. Am. Chem. Soc., 1992, 114, 9, 3312, https://doi.org/10.1021/ja00035a024 . [all data]

DeTuri and Ervin, 1999
DeTuri, V.F.; Ervin, K.M., Competitive threshold collision-induced dissociation: Gas-phase acidities and bond dissociation energies for a series of alcohols, J. Phys. Chem. A, 1999, 103, 35, 6911-6920, https://doi.org/10.1021/jp991459m . [all data]

Mackay, Rakshit, et al., 1982
Mackay, G.I.; Rakshit, A.B.; Bohme, D.K., An Experimental Study of the Reactivity and Relative Basicity of the Methoxide Anion in the Gas Phase at Room Temperature, and their Perturbation by Methanol Solvent, Can. J. Chem., 1982, 60, 20, 2594, https://doi.org/10.1139/v82-373 . [all data]

Caldwell and Kebarle, 1986
Caldwell, G.; Kebarle, P., Mobility of Gaseous Ions in Weak Electric Fields in Unpublished results, 1986. [all data]

Taft, 1983
Taft, R.W., Protonic acidities and basicities in the gas phase and in solution: Substiuent and solvent effects, Prog. Phys. Org. Chem., 1983, 14, 247. [all data]

Ramond, Davico, et al., 2000
Ramond, T.M.; Davico, G.E.; Schwartz, R.L.; Lineberger, W.C., Vibronic structure of alkoxy radicals via photoelectron spectroscopy, J. Chem. Phys., 2000, 112, 3, 1158-1169, https://doi.org/10.1063/1.480767 . [all data]

Haas and Harrison, 1993
Haas, M.J.; Harrison, A.G., The Fragmentation of Proton-Bound Cluster Ions and the Gas-Phase Acidities of Alcohols, Int. J. Mass Spectrom. Ion Proc., 1993, 124, 2, 115, https://doi.org/10.1016/0168-1176(93)80003-W . [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]

Chabinyc and Brauman, 1998
Chabinyc, M.L.; Brauman, J.I., Acidity, basicity, and the stability of hydrogen bonds: Complexes of RO-+HCF3, J. Am. Chem. Soc., 1998, 120, 42, 10863-10870, https://doi.org/10.1021/ja9817592 . [all data]

Dang, Motell, et al., 1993
Dang, T.T.; Motell, E.L.; Travers, M.J.; Clifford, E.P.; Ellison, G.B.; Depuy, C.H.; Bierbaum, V.M., Experimental and Computational Studies of Deuterated Ethanols - Gas-Phase Acidities, Electron Affinities and Bond Dissociation Energies, Int. J. Mass Spectrom. Ion Proc., 1993, 123, 3, 171, https://doi.org/10.1016/0168-1176(93)87096-B . [all data]

Ellison, Engleking, et al., 1982
Ellison, G.B.; Engleking, P.C.; Lineberger, W.C., Photoelectron spectroscopy of alkoxide and enolate negative ions, J. Phys. Chem., 1982, 86, 4873. [all data]

Williams and Hamill, 1968
Williams, J.M.; Hamill, W.H., Ionization potentials of molecules and free radicals and appearance potentials by electron impact in the mass spectrometer, J. Chem. Phys., 1968, 49, 4467. [all data]

Trepka and Neuert, 1963
Trepka, L.v.; Neuert, H., Uber die Entstehenung von Negativen Ionen aus einigen Kohlenwasserstoffen und Alkoholen durch Elektronenstoss, Z. Naturfor., 1963, 18A, 1295. [all data]

Page and Goode, 1969
Page, F.M.; Goode, G.C., Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]


Notes

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