Benzene, 1-iodo-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 - Edward P. Hunter and 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

Quantity Value Units Method Reference Comment
Proton affinity (review)780.3kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity750.8kJ/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
8.40PEBaidin, Misharev, et al., 1985LBLHLM
8.5 ± 0.1EITajima and Tsuchiya, 1972LLK
8.62 ± 0.01PIWatanabe, Nakayama, et al., 1962RDSH
8.65PEBaidin, Misharev, et al., 1985Vertical value; LBLHLM

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C5H5+14.3 ± 0.2C2H2+IEITajima and Tsuchiya, 1973LLK
C5H5+14.34 ± 0.15C2H2+IEITajima and Tsuchiya, 1972LLK
C7H7+11.1 ± 0.1?EITajima and Tsuchiya, 1972LLK
C7H7+11.3IEIYeo and Williams, 1970RDSH

De-protonation reactions

C7H6I- + Hydrogen cation = Benzene, 1-iodo-2-methyl-

By formula: C7H6I- + H+ = C7H7I

Quantity Value Units Method Reference Comment
Δr1557. ± 13.kJ/molG+TSWenthold, Wierschke, et al., 1994gas phase; Between MeCN and FCH2CH2OH; B
Quantity Value Units Method Reference Comment
Δr1527. ± 13.kJ/molIMRBWenthold, Wierschke, et al., 1994gas phase; Between MeCN and FCH2CH2OH; 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]

Baidin, Misharev, et al., 1985
Baidin, V.N.; Misharev, A.D.; Takhistov, V.V., Effect of alkyl substituents on the ionization potentials of halogenobenzenes, Zh. Org. Khim., 1985, 21, 817. [all data]

Tajima and Tsuchiya, 1972
Tajima, S.; Tsuchiya, T., The effects of the repeller voltage and the shield voltage on appearance potential measurements by electron impact, Shitsuryo Bunseki, 1972, 20, 117. [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]

Tajima and Tsuchiya, 1973
Tajima, S.; Tsuchiya, T., Energetics consideration of C5H5+ ions produced from various precursors by electron impact, Bull. Chem. Soc. Jpn., 1973, 46, 3291. [all data]

Yeo and Williams, 1970
Yeo, A.N.H.; Williams, D.H., Rearrangement in the molecular ions of halogenotoluenes prior to fragmentation in the mass spectrometer, Chem. Commun., 1970, 886. [all data]

Wenthold, Wierschke, et al., 1994
Wenthold, P.G.; Wierschke, S.G.; Nash, J.J.; Squires, R.R., Biradical thermochemistry from collision-induced dissociation threshold energy measurements .2. Experimental and theoretical studies of the Mechanism and Thermochemistry of Formation of alph, J. Am. Chem. Soc., 1994, 116, 16, 7378, https://doi.org/10.1021/ja00095a048 . [all data]


Notes

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