Mechanisms and Kinetics of Reaction CHClBr·+NO2

doi:10.1007/s40242-015-5144-9

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (6): 1018-1022.doi: 10.1007/s40242-015-5144-9

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Mechanisms and Kinetics of Reaction CHClBr^·+NO₂

YANG Lei^1,2, LIU Yuyu², DUAN Xuemei¹

1. Institute of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China;
2. Center for Molecular Systems and Organic Devices, Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210023, P. R. China

Received:2015-04-10 Revised:2015-06-23 Online:2015-11-01 Published:2015-09-02
Contact: DUAN Xuemei E-mail:duanxm@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.20973077, 21373098, 21503114, U1301243, 21274064, 21373114, 51273092).

Abstract

Abstract:

The reaction CHClBr^·+NO₂ was investigated via quantum chemical methods and kinetic calculations. The reaction mechanism on the singlet potential energy surface(PES) was considered by B3LYP method, and the energies were calculated at the CCSD(T) and CASPT2 levels of theory. The rate constants and the ratios of products were obtained by utilizing VTST and RRKM methods over wide temperature and pressure ranges. Our results indicate that carbon-to-nitrogen approach via a barrierless process is preferred in the initial association of CHClBr^· and NO₂. The dominant product is BrNO+CHClO(P1), which agrees well with the experimental observation. P2(ClNO+CHBrO) and P3(HNO+CBrClO) may also have minor contributions to the reaction. The calculated overall rate constants are independent of pressure and consistent with the experimental data, which can be fitted with the following equation over the temperature range of 200—1500 K: k(T)=2.31×10^-15T^0.99 exp(771/T). Compared with reaction CH₂Br^·+NO₂, reaction CHClBr^·+NO₂ has decreased the overall rate constants.

Key words: Transition-state theory, Master equation simulation, Atmospheric chemistry, Combustion chemistry, Carbon-centered free radical

YANG Lei, LIU Yuyu, DUAN Xuemei. Mechanisms and Kinetics of Reaction CHClBr^·+NO₂[J]. Chemical Research in Chinese Universities, 2015, 31(6): 1018-1022.

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Mechanisms and Kinetics of Reaction CHClBr^·+NO₂

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