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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:
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 B5H9+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)9.90 ± 0.03eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)167.2kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity159.4kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
9.87 ± 0.02PELloyd, Lynaugh, et al., 1975LLK
9.94PEFehlner, 1975LLK
9.90PEJones and Koski, 1973LLK
10.54 ± 0.01EIMurphy and Enrione, 1970RDSH
10.5EIHollins and Stafford, 1970RDSH
10.5EIFehlner and Koski, 1964RDSH
10.38EIKaufman, Koski, et al., 1963RDSH
10.8EIMargrave, 1960RDSH
10.5PEUlman and Fehlner, 1978Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
B4H+20.0 ± 1.0?EIKaufman, Koski, et al., 1963RDSH
B4H2+18.0 ± 0.2?EIKaufman, Koski, et al., 1963RDSH
B4H3+16.0 ± 0.5?EIKaufman, Koski, et al., 1963RDSH
B4H4+14.1 ± 0.1?EIKaufman, Koski, et al., 1963RDSH
B4H5+15.1 ± 0.3?EIKaufman, Koski, et al., 1963RDSH
B4H6+12.3 ± 0.2BH3?EIKaufman, Koski, et al., 1963RDSH
B5H4+13.0 ± 0.32H2+HEIKaufman, Koski, et al., 1963RDSH
B5H5+12.5 ± 0.52H2EIHollins and Stafford, 1970RDSH
B5H5+12.8 ± 0.22H2EIFehlner and Koski, 1964RDSH
B5H5+12.67 ± 0.032H2EIKaufman, Koski, et al., 1963RDSH
B5H6+12.1 ± 0.3H2+HEIKaufman, Koski, et al., 1963RDSH
B5H7+11.4 ± 0.5H2EIHollins and Stafford, 1970RDSH
B5H7+11.6 ± 0.2H2EIFehlner and Koski, 1964RDSH
B5H7+11.4 ± 0.1H2EIKaufman, Koski, et al., 1963RDSH
B5H8+11.84 ± 0.01HEIMurphy and Enrione, 1971LLK


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]

Lloyd, Lynaugh, et al., 1975
Lloyd, D.R.; Lynaugh, N.; Roberts, P.J.; Guest, M.F., Photoelectron studies of boron and compounds, Part 5. -Higher boron hydrides B4H10, B5H9, B10H14, J. Chem. Soc. Faraday Trans. 2, 1975, 71, 1382. [all data]

Fehlner, 1975
Fehlner, T.P., Photoelectron spectroscopy of closo-carboranes. Observation of exo-polyhedral molecular orbitals, Inorg. Chem., 1975, 14, 934. [all data]

Jones and Koski, 1973
Jones, R.W.; Koski, W.S., Photoelectron spectrum of pentaborane, J. Chem. Phys., 1973, 59, 1228. [all data]

Murphy and Enrione, 1970
Murphy, C.B., Jr.; Enrione, R.E., Ionization potentials of pentaborane(9) derivatives by electron impact and molecular orbital calculations, Intern. J. Mass Spectrom. Ion Phys., 1970, 5, 157. [all data]

Hollins and Stafford, 1970
Hollins, R.E.; Stafford, F.E., Molecular beam mass spectra and pyrolysis of pentaborane(9), tetraborane carbonyl, and pentaborane(ll). Formation and mass spectrum of tetraborane(8), Inorg. Chem., 1970, 9, 877. [all data]

Fehlner and Koski, 1964
Fehlner, T.P.; Koski, W.S., The fragmentation of some boron hydrides by electron impact, J. Am. Chem. Soc., 1964, 86, 581. [all data]

Kaufman, Koski, et al., 1963
Kaufman, J.J.; Koski, W.S.; Kuhns, L.J.; Wright, S.S., Appearance and ionization potentials of selected fragments from isotopically labeled pentaboranes, J. Am. Chem. Soc., 1963, 85, 1369. [all data]

Margrave, 1960
Margrave, J.L., Ionization potentials of B5H9, B5H8I, B10H14, and B10H13C2H5 from electron impact studies, J. Chem. Phys., 1960, 32, 1889. [all data]

Ulman and Fehlner, 1978
Ulman, J.A.; Fehlner, T.P., Ultraviolet photoelectron spectroscopy of boranes and carboranes. Five-, six-, and seven- atom frameworks, J. Am. Chem. Soc., 1978, 100, 449. [all data]

Murphy and Enrione, 1971
Murphy, C.B., Jr.; Enrione, R.E., Bond dissociation energies of the 1- and 2- isomers of pentaborane derivatives by electron impact by extended Huckel calculations, Int. J. Mass Spectrom. Ion Phys., 1971, 7, 327. [all data]


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