Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

2-Butene, 2-methyl-

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

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 - E.P. Hunter and S.G. Lias
L - S.G. Lias

Data compiled as indicated in comments:
LBLHLM - S.G. Lias, J.E. Bartmess, J.F. Liebman, J.L. Holmes, R.D. Levin, and W.G. Mallard
LLK - S.G. Lias, R.D. Levin, and S.A. Kafafi
RDSH - H.M. Rosenstock, K. Draxl, B.W. Steiner, and J.T. Herron

View reactions leading to C5H10+ (ion structure unspecified)

IE (evaluated)8.69 ± 0.01eVN/AN/AL
Proton affinity (review)808.8kJ/molN/AHunter and Lias, 1998HL
Gas basicity779.9kJ/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV)MethodReferenceComment
8.69PITraeger, 1986LBLHLM
8.68 ± 0.02PEBieri, Burger, et al., 1977LLK
8.682 ± 0.003PEMasclet, Grosjean, et al., 1973LLK
8.70EILossing, 1972LLK
8.83 ± 0.11EIGross and Wilkins, 1971LLK
8.72PEFrost and Sandhu, 1971LLK
8.85 ± 0.04EIBock and Seidl, 1968RDSH
8.67 ± 0.02PIWatanabe, Nakayama, et al., 1962RDSH
8.68PIBralsford, Harris, et al., 1960RDSH

Appearance energy determinations

IonAE (eV)Other ProductsMethodReferenceComment
C3H6+11.70 ± 0.11C2H4EIGross and Wilkins, 1971LLK
C4H7+10.80CH3PITraeger, 1986LBLHLM
C4H7+10.84CH3EIBrand and Baer, 1984LBLHLM
C4H7+10.84CH3EILossing, 1972LLK
C4H7+11.33 ± 0.12CH3EIGross and Wilkins, 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. [doi:10.1063/1.556018] [all data]

Traeger, 1986
Traeger, J.C., Heat of formation for the 1-methylallyl cation by photoionization mass spectrometry, J. Phys. Chem., 1986, 90, 4114. [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]

Masclet, Grosjean, et al., 1973
Masclet, P.; Grosjean, D.; Mouvier, G., Alkene ionization potentials. Part I. Quantitative determination of alkyl group structural effects, J. Electron Spectrosc. Relat. Phenom., 1973, 2, 225. [all data]

Lossing, 1972
Lossing, F.P., Free radicals by mass spectrometry. XLV. Ionization potentials and heats of formation of C3H3, C3H5, and C4H7 radicals and ions, Can. J. Chem., 1972, 50, 3973. [all data]

Gross and Wilkins, 1971
Gross, M.L.; Wilkins, C.L., Computer-assisted ion cyclotron resonance appearance potential measurements for C5H10 isomers, Anal. Chem., 1971, 43, 1624. [all data]

Frost and Sandhu, 1971
Frost, D.C.; Sandhu, J.S., Ionization potentials of ethylene and some methyl-substituted ethylenes as determined by photoelectron spectroscopy, Indian J. Chem., 1971, 9, 1105. [all data]

Bock and Seidl, 1968
Bock, H.; Seidl, H., d-Orbitaleffekte in siliziumsubstituierten «pi»-Elektronensystemen. VI. Spektroskopische Untersuchungen an Alkyl- und Silylathylenen, J. Organometal. Chem., 1968, 13, 87. [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]

Bralsford, Harris, et al., 1960
Bralsford, R.; Harris, P.V.; Price, W.C., The effect of fluorine on the electronic spectra and ionization potentials of molecules, Proc. Roy. Soc. (London), 1960, A258, 459. [all data]

Brand and Baer, 1984
Brand, W.A.; Baer, T., Dissociation dynamics of energy-selected C5H10+ ions, J. Am. Chem. Soc., 1984, 106, 3154. [all data]


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