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Ethanol

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Gas phase ion energetics data

Go To: Top, References, Notes

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

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
MM - Michael M. Meot-Ner (Mautner)
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C2H6O+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)10.48 ± 0.07eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)185.6kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity178.kcal/molN/AHunter and Lias, 1998HL

Proton affinity at 298K

Proton affinity (kcal/mol) Reference Comment
186.3 ± 0.2Tabrizchi and Shooshtari, 2003T = 403-453K; Authors report only relative PAs. Absolute values are referenced here to PA(CH3COOC2H5) = 835.7 kJ/mol as listed in Hunter and Lias, 1998, although average PA(CH3COOC2H5) from the literature sources in Hunter and Lias, 1998 is 831.0 kJ/mol; MM

Ionization energy determinations

IE (eV) Method Reference Comment
10.41 ± 0.05EIHolmes and Lossing, 1991LL
10.4PEOhno, Imai, et al., 1985LBLHLM
10.47 ± 0.07EIBowen and Maccoll, 1984LBLHLM
10.3PEOhno, Imai, et al., 1983LBLHLM
10.5EIMishchanchuk, Pokrovskii, et al., 1982LBLHLM
10.7PEVon Niessen, Bieri, et al., 1980LLK
10.49 ± 0.01PIPotapov and Sorokin, 1972LLK
10.46 ± 0.02PECocksey, Eland, et al., 1971LLK
10.65PEBaker, Betteridge, et al., 1971LLK
10.46PEDewar and Worley, 1969RDSH
10.47 ± 0.02PIRefaey and Chupka, 1968RDSH
10.48 ± 0.05PIWatanabe, Nakayama, et al., 1962RDSH
10.64PEOhno, Imai, et al., 1985Vertical value; LBLHLM
10.64PEUtsunomiya, Kobayashi, et al., 1980Vertical value; LLK
10.65PEHoppilliard and Solgadi, 1980Vertical value; LLK
10.61PEBenoit and Harrison, 1977Vertical value; LLK
10.65 ± 0.03PEPeel and Willett, 1975Vertical value; LLK
10.59PEVovna, Lopatin, et al., 1974Vertical value; LLK
10.04PESchweig and Thiel, 1974Vertical value; LLK
10.62PERobin and Kuebler, 1973Vertical value; LLK
10.64PEKatsumata, Iwai, et al., 1973Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C+22.9 ± 0.5H2+H+CH2OHEIStepanov, Perov, et al., 1988LL
CH2O+11.70CH4PIRefaey and Chupka, 1968RDSH
CH3+14.70 ± 0.10?EIHaney and Franklin, 1969RDSH
CH3O+11.25 ± 0.09CH3EIBowen and Maccoll, 1984LBLHLM
CH3O+11.40 ± 0.06CH3EISelim and Helal, 1981LLK
CH3O+11.30CH3EILossing, 1977LLK
CH3O+11.20 ± 0.05CH3PIPotapov and Sorokin, 1972LLK
CH3O+11.25CH3PIRefaey and Chupka, 1968RDSH
C2H3+14.7?EIFriedman, Long, et al., 1957RDSH
C2H3O+14.5H2+HEIFriedman, Long, et al., 1957RDSH
C2H4+12.0 ± 0.9H2OEIBowen and Maccoll, 1984LBLHLM
C2H4+12.0H2OPIRefaey and Chupka, 1968RDSH
C2H4O+~10.45H2EIHolmes, Terlouw, et al., 1976LLK
C2H5+12.7OHPIRefaey and Chupka, 1968RDSH
C2H5O+10.78 ± 0.09HEIBowen and Maccoll, 1984LBLHLM
C2H5O+10.6HEIMishchanchuk, Pokrovskii, et al., 1982LBLHLM
C2H5O+10.67HEILossing, 1977LLK
C2H5O+10.75 ± 0.03HEISolka and Russell, 1974LLK
C2H5O+10.80 ± 0.05HPIPotapov and Sorokin, 1972LLK
C2H5O+10.78 ± 0.02HPIRefaey and Chupka, 1968RDSH
C2H5O+[CH3CHOH+]10.801 ± 0.005HPIRuscic and Berkowitz, 1994T = 0K; LL
H+21.0 ± 0.5CH2+CH2OHEIStepanov, Perov, et al., 1988LL
H2O+13.06C2H4EILewis and Hamill, 1970RDSH
H3O+13.8H2+C2H3PIPECONiwa, Nishimura, et al., 1982LBLHLM
H3O+14.30 ± 0.02?EIHaney and Franklin, 1969, 2RDSH
O+21.7 ± 0.52CH3EIStepanov, Perov, et al., 1988LL

De-protonation reactions

C2H5O- + Hydrogen cation = Ethanol

By formula: C2H5O- + H+ = C2H6O

Quantity Value Units Method Reference Comment
Deltar379.2 ± 1.0kcal/molD-EARamond, Davico, et al., 2000gas phase; B
Deltar378.0 ± 2.0kcal/molCIDCHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Deltar377.4 ± 2.1kcal/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Deltar379.10 ± 0.10kcal/molCIDTDeTuri and Ervin, 1999gas phase; B
Quantity Value Units Method Reference Comment
Deltar372.6 ± 1.1kcal/molH-TSRamond, Davico, et al., 2000gas phase; B
Deltar371.4 ± 2.1kcal/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Deltar370.8 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

Anion protonation reactions

C2H5O- + Hydrogen cation = Ethanol

By formula: C2H5O- + H+ = C2H6O

Quantity Value Units Method Reference Comment
Deltar379.2 ± 1.0kcal/molD-EARamond, Davico, et al., 2000gas phase; B
Deltar378.0 ± 2.0kcal/molCIDCHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Deltar377.4 ± 2.1kcal/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Deltar379.10 ± 0.10kcal/molCIDTDeTuri and Ervin, 1999gas phase; B
Quantity Value Units Method Reference Comment
Deltar372.6 ± 1.1kcal/molH-TSRamond, Davico, et al., 2000gas phase; B
Deltar371.4 ± 2.1kcal/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Deltar370.8 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

References

Go To: Top, 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.

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Tabrizchi and Shooshtari, 2003
Tabrizchi, M.; Shooshtari, S., Proton affinity measurements using ion mobility spectrometry, J. Chem. Thermodynamics, 2003, 35, 863. [all data]

Holmes and Lossing, 1991
Holmes, J.L.; Lossing, F.P., Ionization energies of homologous organic compounds and correlation with molecular size, Org. Mass Spectrom., 1991, 26, 537. [all data]

Ohno, Imai, et al., 1985
Ohno, K.; Imai, K.; Harada, Y., Variations in reactivity of lone-pair electrons due to intramolecular hydrogen bonding as observed by penning ionization electron spectroscopy, J. Am. Chem. Soc., 1985, 107, 8078. [all data]

Bowen and Maccoll, 1984
Bowen, R.D.; Maccoll, A., Low energy, low temperature mass spectra, Org. Mass Spectrom., 1984, 19, 379. [all data]

Ohno, Imai, et al., 1983
Ohno, K.; Imai, K.; Matsumoto, S.; Harada, Y., Penning ionization electron spectroscopy of C2H5X (X = NH2, OH, H, Cl, I) relative reactivity of orbital localizing on functional groups upon electrophilic attack by metastable helium atoms, J. Phys. Chem., 1983, 87, 4346. [all data]

Mishchanchuk, Pokrovskii, et al., 1982
Mishchanchuk, B.G.; Pokrovskii, V.A.; Shabel'nikov, V.P.; Korol, E.N., Mass spectrometric study of energy characteristics of methanol and ethanol ions during ionization by a strong electric field, Teor. Eksp. Khim., 1982, 18, 307. [all data]

Von Niessen, Bieri, et al., 1980
Von Niessen, W.; Bieri, G.; Asbrink, L., 30.4 nm He(II) photoelectron spectra of organic molecules. Part III. Oxo-compounds (C,H,O), J. Electron Spectrosc. Relat. Phenom., 1980, 21, 175. [all data]

Potapov and Sorokin, 1972
Potapov, V.K.; Sorokin, V.V., Kinetic energies of products of dissociative photoionization of molecules. I. Aliphatic ketones and alcohols, Khim. Vys. Energ., 1972, 6, 387. [all data]

Cocksey, Eland, et al., 1971
Cocksey, B.J.; Eland, J.H.D.; Danby, C.J., The effect of alkyl substitution on ionisation potential, J. Chem. Soc., 1971, (B), 790. [all data]

Baker, Betteridge, et al., 1971
Baker, A.D.; Betteridge, D.; Kemp, N.R.; Kirby, R.E., Application of photoelectron spectrometry to pesticide analysis. II.Photoelectron spectra of hydroxy-, and halo-alkanes and halohydrins, Anal. Chem., 1971, 43, 375. [all data]

Dewar and Worley, 1969
Dewar, M.J.S.; Worley, S.D., Photoelectron spectra of molecules. I. Ionization potentials of some organic molecules and their interpretation, J. Chem. Phys., 1969, 50, 654. [all data]

Refaey and Chupka, 1968
Refaey, K.M.A.; Chupka, W.A., Photoionization of the lower aliphatic alcohols with mass analysis, J. Chem. Phys., 1968, 48, 5205. [all data]

Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J., Ionization potentials of some molecules, J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]

Utsunomiya, Kobayashi, et al., 1980
Utsunomiya, C.; Kobayashi, T.; Nagakura, S., Photoelectron angular distribution measurements for some aliphatic alcohols, amines, halides, Bull. Chem. Soc. Jpn., 1980, 53, 1216. [all data]

Hoppilliard and Solgadi, 1980
Hoppilliard, Y.; Solgadi, D., Conformational analysis of 2-haloethanols and 2-methoxyethylhalides in a photoelectron spectrometer, Tetrahedron, 1980, 36, 377. [all data]

Benoit and Harrison, 1977
Benoit, F.M.; Harrison, A.G., Predictive value of proton affinity. Ionization energy correlations involving oxygenated molecules, J. Am. Chem. Soc., 1977, 99, 3980. [all data]

Peel and Willett, 1975
Peel, J.B.; Willett, G.D., Photoelectron spectroscopic studies of the higher alcohols, Aust. J. Chem., 1975, 28, 2357. [all data]

Vovna, Lopatin, et al., 1974
Vovna, V.I.; Lopatin, S.N.; Pettsold, R.; Vilesov, F.I.; Akopyan, M.E., Photoelectron spectra of a number of substitution products of thiophosphoryl chloride, Opt. Spectrosc., 1974, 36, 99. [all data]

Schweig and Thiel, 1974
Schweig, A.; Thiel, W., Photoionization cross sections: He I- and He II-photoelectron spectra of homologous oxygen and sulphur compounds, Mol. Phys., 1974, 27, 265. [all data]

Robin and Kuebler, 1973
Robin, M.B.; Kuebler, N.A., Excited electronic states of the simple alcohols, J. Electron Spectrosc. Relat. Phenom., 1973, 1, 13. [all data]

Katsumata, Iwai, et al., 1973
Katsumata, S.; Iwai, T.; Kimura, K., Photoelectron spectra and sum rule consideration. Higher alkyl amines and alcohols, Bull. Chem. Soc. Jpn., 1973, 46, 3391. [all data]

Stepanov, Perov, et al., 1988
Stepanov, A.N.; Perov, A.A.; Kabanov, S.P.; Simonov, A.P., Formation of long-lived, highly excited atoms during dissociative excitation of CH3CN, CH3CH2OH, CH3COOH, HCOOH, and C4H4S molecules on electron impact, Russ. J. Phys. Chem., 1988, 22, 81. [all data]

Haney and Franklin, 1969
Haney, M.A.; Franklin, J.L., Excess energies in mass spectra of some oxygen-containing organic compounds, J. Chem. Soc. Faraday Trans., 1969, 65, 1794. [all data]

Selim and Helal, 1981
Selim, E.T.M.; Helal, A.I., Heat of formation of CH2=OH+ fragment ion, Indian J. Pure Appl. Phys., 1981, 19, 977. [all data]

Lossing, 1977
Lossing, F.P., Heats of formation of some isomeric [CnH2n+1]+ ions. Substitutional effects on ion stability, J. Am. Chem. Soc., 1977, 99, 7526. [all data]

Friedman, Long, et al., 1957
Friedman, L.; Long, F.A.; Wolfsberg, M., Study of the mass spectra of the lower aliphatic alcohols, J. Chem. Phys., 1957, 27, 613. [all data]

Holmes, Terlouw, et al., 1976
Holmes, J.L.; Terlouw, J.K.; Lossing, F.P., The thermochemistry of C2H4O+ ions, J. Phys. Chem., 1976, 80, 2860. [all data]

Solka and Russell, 1974
Solka, B.H.; Russell, M.E., Energetics of formation of some structural isomers of gaseous C2H5O+ C2H6N+ ions, J. Phys. Chem., 1974, 78, 1268. [all data]

Ruscic and Berkowitz, 1994
Ruscic, B.; Berkowitz, J., The heats of formation of some C2H5O+ isomers, relevant bond energies in ethanol and PA(CH3CHO), J. Chem. Phys., 1994, 101, 10936. [all data]

Lewis and Hamill, 1970
Lewis, D.; Hamill, W.H., Excited states of neutral molecular fragments from appearance potentials by electron impact in a mass spectrometer, J. Chem. Phys., 1970, 52, 6348. [all data]

Niwa, Nishimura, et al., 1982
Niwa, Y.; Nishimura, T.; Tsuchiya, T., Ionic dissociation of ethanol studied by photoelectron-photoion coincidence spectroscopy, Int. J. Mass Spectrom. Ion Processes, 1982, 42, 91. [all data]

Haney and Franklin, 1969, 2
Haney, M.A.; Franklin, J.L., Heats of formation of H3O+, H3S+, and NH4+ by electron impact, J. Chem. Phys., 1969, 50, 2028. [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]

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]


Notes

Go To: Top, Gas phase ion energetics data, References