Benzene, 1-methyl-2-nitro-

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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:
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
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

View reactions leading to C7H7NO2+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)9.24eVN/AN/AL

Electron affinity determinations

EA (eV) Method Reference Comment
0.92 ± 0.10TDEqChowdhury, Heinis, et al., 1986«DELTA»Gea(423 K) = -20.7 kcal/mol; «DELTA»Sea = -1.6 eu.; B
0.954 ± 0.048IMREFukuda and McIver, 1985«DELTA»Gea(355 K) = -21.4 kcal/mol; «DELTA»Sea =-1.6, est. from data in Chowdhury, Heinis, et al., 1986; B
0.880 ± 0.030ECDChen, Chen, et al., 1992B
<1.240 ± 0.050PDMock and Grimsrud, 1989B

Ionization energy determinations

IE (eV) Method Reference Comment
9.24PIPECOShao and Baer, 1988LL
9.51 ± 0.03EIBaldwin, Carter, et al., 1982LBLHLM
9.50PEPalmer, Moyes, et al., 1979LLK
9.43 ± 0.05PIMatyuk, Potapov, et al., 1979LLK
9.63PEKobayashi and Nagakura, 1974Vertical value; LLK
10.2 ± 0.1SIGol'denfel'd, Korostyshevskii, et al., 1973Vertical value; LLK
9.69 ± 0.015PEKobayashi and Nagakura, 1972Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C5H5+14.8C2H2+NO2EITajima and Tsuchiya, 1973LLK
C5H5+13.5 ± 0.2HCN+CO+OHEITajima and Tsuchiya, 1973LLK
C7H6NO+<=9.69OHPIPECOShao and Baer, 1988LL
C7H6NO+9.69 ± 0.05OHPIMatyuk, Potapov, et al., 1979LLK
C7H7+11.0 ± 0.1NO2PIMatyuk, Potapov, et al., 1979LLK
C7H7+13.1 ± 0.3NO2EIMcLafferty and Winkler, 1974LLK

De-protonation reactions

C7H6NO2- + Hydrogen cation = Benzene, 1-methyl-2-nitro-

By formula: C7H6NO2- + H+ = C7H7NO2

Quantity Value Units Method Reference Comment
Deltar1490. ± 8.8kJ/molG+TSTaft, 1987gas phase; value altered from reference due to change in acidity scale; B
Quantity Value Units Method Reference Comment
Deltar1459. ± 8.4kJ/molIMRETaft, 1987gas phase; value altered from reference due to change in acidity scale; 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.

Chowdhury, Heinis, et al., 1986
Chowdhury, S.; Heinis, T.; Grimsrud, E.P.; Kebarle, P., Entropy Changes and Electron Affinities from Gas-Phase Electron Transfer Equilibria: A- + B = A + B-, J. Phys. Chem., 1986, 90, 12, 2747, . [all data]

Fukuda and McIver, 1985
Fukuda, E.K.; McIver, R.T., Jr., Relative electron affinities of substituted benzophenones, nitrobenzenes, and quinones. [Anchored to EA(SO2) from 74CEL/BEN], J. Am. Chem. Soc., 1985, 107, 2291. [all data]

Chen, Chen, et al., 1992
Chen, E.C.M.; Chen, E.S.; Milligan, M.S.; Wentworth, W.E.; Wiley, J.R., Experimental Determination of the Electron Affinities of Nitrobenzene, Nitrotoluenes, Pentafluoronitrobenzene, and Isotopic Nitrobenzenes an, J. Phys. Chem., 1992, 96, 5, 2385, . [all data]

Mock and Grimsrud, 1989
Mock, R.S.; Grimsrud, E.P., Gas-Phase Electron Photodetachment Spectroscopy of the Molecular Anions of Nitroaromatic Hydrocarbons at Atmospheric Pressure, J. Am. Chem. Soc., 1989, 111, 8, 2861, . [all data]

Shao and Baer, 1988
Shao, J.D.; Baer, T., The dissociation dynamics of energy selected o-nitrotoluene ions, Int. J. Mass Spectrom. Ion Processes, 1988, 86, 357. [all data]

Baldwin, Carter, et al., 1982
Baldwin, M.A.; Carter, D.M.; Gilmore, J., Loss of hydroxyl radical from isomeric ethylnitrobenzenes, Org. Mass Spectrom., 1982, 17, 45. [all data]

Palmer, Moyes, et al., 1979
Palmer, M.H.; Moyes, W.; Spiers, M.; Ridyard, J.N.A., The electronic structure of substituted benzenes; ab initio calculations and photoelectron spectra for nitrobenzene, the nitrotoluenes, dinitrobenzenes and fluoronitrobenzenes, J. Mol. Struct., 1979, 55, 243. [all data]

Matyuk, Potapov, et al., 1979
Matyuk, V.M.; Potapov, V.K.; Prokhoda, A.L., Photoexcitation and photoionisation of nitro- derivatives of benzene and toluene, Russ. J. Phys. Chem., 1979, 53, 538. [all data]

Kobayashi and Nagakura, 1974
Kobayashi, T.; Nagakura, S., Photoelectron spectra of substituted benzenes, Bull. Chem. Soc. Jpn., 1974, 47, 2563. [all data]

Gol'denfel'd, Korostyshevskii, et al., 1973
Gol'denfel'd, I.V.; Korostyshevskii, I.Z.; Mischanchuk, B.G.; Pokrovskii, V.A., Determination of ionization potentials of atoms and molecules using a field mass spectrometer equipped with an energy analyzer, Dokl. Akad. Nauk SSSR, 1973, 213, 626. [all data]

Kobayashi and Nagakura, 1972
Kobayashi, T.; Nagakura, S., Photoelectron spectra of nitro-compounds, Chem. Lett., 1972, 903. [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]

McLafferty and Winkler, 1974
McLafferty, F.W.; Winkler, J., Gaseous tropylium, benzyl, tolyl, and norbornadienyl cations, J. Am. Chem. Soc., 1974, 96, 5182. [all data]

Taft, 1987
Taft, R.W., The Nature and Analysis of Substitutent Electronic Effects, Personal communication. See also Prog. Phys. Org. Chem., 1987, 16, 1. [all data]


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