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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 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
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 C4H8O+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)9.82 ± 0.04eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)792.7kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity760.8kJ/molN/AHunter and Lias, 1998HL

Electron affinity determinations

EA (eV) Method Reference Comment
0.000694EFDDesfrancois, Abdoul-Carime, et al., 1994EA: 0.7 meV. Dipole-bound state.; B

Ionization energy determinations

IE (eV) Method Reference Comment
9.83PITraeger and McAdoo, 1986LBLHLM
9.8EIMcAdoo and Hudson, 1983LBLHLM
9.73 ± 0.015EIEl-Sherbini, Allam, et al., 1981LLK
9.836 ± 0.005PEHernandez, Masclet, et al., 1977LLK
9.73 ± 0.03PECocksey, Eland, et al., 1971LLK
9.86 ± 0.02PIWatanabe, Nakayama, et al., 1962RDSH
9.85PEBenoit and Harrison, 1977Vertical value; LLK
9.83PEKimura, Katsumata, et al., 1975Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C2H3O+10.19C2H5PITraeger and McAdoo, 1986LBLHLM
C2H4O+10.52C2H4EIHolmes, Terlouw, et al., 1976LLK
C3H5O+10.22?EIMouvier and Hernandez, 1975LLK

De-protonation reactions

C4H7O- + Hydrogen cation = Butanal

By formula: C4H7O- + H+ = C4H8O

Quantity Value Units Method Reference Comment
Δr1526. ± 8.8kJ/molD-EAAlconcel, Deyerl, et al., 2001gas phase; B
Δr1523. ± 9.6kJ/molD-EAZimmerman, Reed, et al., 1977gas phase; B
Quantity Value Units Method Reference Comment
Δr1499. ± 9.6kJ/molH-TSAlconcel, Deyerl, et al., 2001gas phase; B
Δr1496. ± 10.kJ/molH-TSZimmerman, Reed, et al., 1977gas phase; B


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]

Desfrancois, Abdoul-Carime, et al., 1994
Desfrancois, C.; Abdoul-Carime, H.; Khelifa, N.; Schermann, J.P., Fork 1/r to 1/r2 Potentials: Electron Exchange between Rydberg Atoms and Polar Molecules, Phys. Rev. Lett., 1994, 73, 18, 2436, https://doi.org/10.1103/PhysRevLett.73.2436 . [all data]

Traeger and McAdoo, 1986
Traeger, J.C.; McAdoo, D.J., Decomposition thresholds and associated translational energy releases for eight C4H8O+ isomers, Int. J. Mass Spectrom. Ion Processes, 1986, 68, 35. [all data]

McAdoo and Hudson, 1983
McAdoo, D.J.; Hudson, C.E., The decompositions of metastable [C4H8O]+ ions and the [C4H8O]+ potential surface, Org. Mass Spectrom., 1983, 18, 466. [all data]

El-Sherbini, Allam, et al., 1981
El-Sherbini, T.M.; Allam, S.H.; Migahed, M.D.; Dawoud, A.M., Mass spectrometric investigation of aliphatic aldehydes, Z. Naturforsch. A:, 1981, 36, 1334. [all data]

Hernandez, Masclet, et al., 1977
Hernandez, R.; Masclet, P.; Mouvier, G., Spectroscopie de photoelectrons d'aldehydes et de cetones aliphatiques, J. Electron Spectrosc. Relat. Phenom., 1977, 10, 333. [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]

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]

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]

Kimura, Katsumata, et al., 1975
Kimura, K.; Katsumata, S.; Yamazaki, T.; Wakabayashi, H., UV photoelectron spectra and sum rule consideration; out-of-plane orbitals of unsaturated compounds with planar-skeleton structure, J. Electron Spectrosc. Relat. Phenom., 1975, 6, 41. [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]

Mouvier and Hernandez, 1975
Mouvier, G.; Hernandez, R., Ionisation and appearance potentials of alkylketones, Org. Mass Spectrom., 1975, 10, 958. [all data]

Alconcel, Deyerl, et al., 2001
Alconcel, L.S.; Deyerl, H.J.; Continetti, R.E., Effects of alkyl substitution on the energetics of enolate anions and radicals, J. Am. Chem. Soc., 2001, 123, 50, 12675-12681, https://doi.org/10.1021/ja0120431 . [all data]

Zimmerman, Reed, et al., 1977
Zimmerman, A.H.; Reed, K.J.; Brauman, J.I., Photodetachment of electrons from enolate anions. Gas phase electron affinities of enolate radicals, J. Am. Chem. Soc., 1977, 99, 7203. [all data]


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