Cyclopentane, methylene-

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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

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 C6H10+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
Proton affinity (review)198.9kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity192.0kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
8.70 ± 0.05EIWolkoff and Holmes, 1979LLK
8.96 ± 0.02PEBieri, Burger, et al., 1977LLK
7.2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
9.26 ± 0.05EIPraet, 1970RDSH
8.55 ± 0.01PIPraet, 1970RDSH
8.51 ± 0.01PEPraet and Delwiche, 1970RDSH
8.94 ± 0.01PIDemeo and El-Sayed, 1970RDSH
9.05 ± 0.02EIWinters and Collins, 1969RDSH
9.14PEWiberg, Ellison, et al., 1976Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C3H3+13.44 ± 0.20?EIWinters and Collins, 1969RDSH
C3H5+10.2C3H5EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C3H5+14.05 ± 0.05C3H5EIPraet, 1970RDSH
C3H5+12.03 ± 0.13?EIWinters and Collins, 1969RDSH
C4H5+9.7C2H5EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C4H5+12.69 ± 0.17?EIWinters and Collins, 1969RDSH
C4H6+10.2C2H4EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C4H6+12.32 ± 0.05C2H4EIPraet, 1970RDSH
C4H6+10.88 ± 0.07?EIWinters and Collins, 1969RDSH
C5H5+13.45 ± 0.19?EIWinters and Collins, 1969RDSH
C5H7+10.02 ± 0.05CH3EIWolkoff and Holmes, 1979LLK
C5H7+8.2CH3EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C5H7+11.71 ± 0.05CH3EIPraet, 1970RDSH
C5H7+9.65 ± 0.03CH3EIWinters and Collins, 1969RDSH
C5H8+9.2CH2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C6H7+11.66 ± 0.16H2+HEIWinters and Collins, 1969RDSH
C6H8+8.7H2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C6H9+12.13 ± 0.05HEIPraet, 1970RDSH
C6H9+10.20 ± 0.03HEIWinters and Collins, 1969RDSH


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, . [all data]

Wolkoff and Holmes, 1979
Wolkoff, P.; Holmes, J.L., Isomeric cyclic [C6H10]+ ions. The energy barrier to ring opening, Can. J. Chem., 1979, 57, 348. [all data]

Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P., Valence ionization enrgies of hydrocarbons, Helv. Chim. Acta, 1977, 60, 2213. [all data]

Shikhmamedbekova, Aslanov, et al., 1970
Shikhmamedbekova, A.Z.; Aslanov, F.A.; Gadzhiev, M.M.; Gulamova, T.E.; Akhmedova, F.N., Mass spectrometric study of methylene cycloalkenes, Dokl. Phys. Chem., 1970, 26, 34. [all data]

Praet, 1970
Praet, M.-Th., Ionisation et dissociation du 1-methyl-cyclopentene, du methylenecyclopentane et de quelques isomeres par impact d'electrons et de photons, Org. Mass Spectrom., 1970, 4, 65. [all data]

Praet and Delwiche, 1970
Praet, M.-T.; Delwiche, J., Ionization energies of some cyclic molecules, Chem. Phys. Lett., 1970, 5, 546. [all data]

Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A., Ionization potential and structure of olefins, J. Chem. Phys., 1970, 52, 2622. [all data]

Winters and Collins, 1969
Winters, R.E.; Collins, J.H., Mass spectrometric studies of structural isomers. II.Mono- and bicyclic C6H10 molecules, Org. Mass Spectrom., 1969, 2, 299. [all data]

Wiberg, Ellison, et al., 1976
Wiberg, K.B.; Ellison, G.B.; Wendoloski, J.J.; Brundle, C.R.; Kuebler, N.A., Electronic states of organic molecules. 3. Photoelectron spectra of cycloalkenes and methylenecycloalkanes, J. Am. Chem. Soc., 1976, 98, 7179. [all data]


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