Abstract
The present work provides quantitative results for the rate of unimolecular carbon-hydrogen bond fission reaction of benzene and nitro benzene at elevated temperatures up to 2000 K. The potential energy surface for each C-H (in the ortho, meta, and para sites) bond fission reaction of nitro benzene was investigated by ab initio calculations. The geometry and vibrational frequencies of the species involved in this process were optimized at the MP2 level of theory, using the cc-pvdz basis set. Since C-H bond fission channel is barrier less reaction, we have used variational RRKM theory to predict rate constants. By means of calculated rate constant at the different temperatures, the activation energy and exponential factor were determined. The Arrhenius expression for C-H bond fission reaction of nitro benzene on the ortho, meta and para sites are k(T) = 2.1 × 1017exp(−56575.98/T), k(T) = 2.1 × 1017exp(−57587.45/T), and k(T) = 3.3 × 1016exp(−57594.79/T) respectively. The Arrhenius expression for C-H bond fission reaction of benzene is k(T) = 2 × 1018exp(−59343.48.18/T). The effect of NO2 group, location of hydrogen atoms on the substituted benzene ring, reaction degeneracy, benzene ring resonance and tunneling effect on the rate expression have been discussed.
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Manesh, A.T., Heidarnezhad, Z.a. & Masnabadi, N. Variational RRKM theory calculation of thermal rate constant for carbon—hydrogen bond fission reaction of nitro benzene. Russ. J. Phys. Chem. 87, 1175–1179 (2013). https://doi.org/10.1134/S0036024413070376
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DOI: https://doi.org/10.1134/S0036024413070376