Rate constants calculation of hydrogen abstraction reactions CH3CHBr+HBr and CH3CBr2+HBr

Rate constants calculation of hydrogen abstraction reactions CH3CHBr+HBr and CH3CBr2+HBr
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夺氢反应 CH3CHBr HBr 和 CH3CBr2 HBr 的速率常数计算

DOI:
10.1002/qua.24076
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发表时间:
2013-04
影响因子:
2.2
通讯作者:
Zhang, Jinglai
Zhang, Jinglai
中科院分区:
化学3区
文献类型:
--
作者:
Wang, Li;Zhao, Jianxiang;He, Hongqing;Zhang, Jinglai

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用双水平直接动力学方法研究了CH 3CHBr + HBr CH 3CH 2Br + Br(R1)和CH 3CBr 2 + HBr CH 3CHBr 2 + Br(R2)的夺氢反应动力学性质.在MPW 1 K/6-311+G(d,p),MPW 1 K/ma-TZVP和BMK/6-311 + G(d,p)水平上,得到了最小能量路径沿着所有驻点和额外点的优化几何构型和频率.在MPW 1 K/6-311+G(d,p)和MPW 1 K/ma-TZVP水平上,两个能量小于反应物能量的络合物分别位于反应的入口处.在G2 M(RCC 5)//MPW 1 K/6-311+G(d,p)水平上,用内插单点能量方法对能量分布进行了进一步的修正.采用改进的正则变分过渡态理论和小曲率隧穿修正(SCT),计算了2002000 K宽温度范围内的速率常数。我们的计算表明,自由基的反应活性从CH 3CHBr到CH 3CBr 2降低。最后,用两个修正的Arrhenius公式拟合了总速率常数。(c)2012年威利期刊公司
Dual-level direct dynamics method is used to study the kinetic properties of the hydrogen abstraction reactions of CH3CHBr + HBr CH3CH2Br + Br (R1) and CH3CBr2 + HBr CH3CHBr2 + Br (R2). Optimized geometries and frequencies of all the stationary points and extra points along the minimum-energy path are obtained at the MPW1K/6-311+G(d,p), MPW1K/ma-TZVP, and BMK/6-311+G(d,p) levels. Two complexes with energies less than that of the reactants are located in the entrance of each reaction at the MPW1K/6-311+G(d,p) and MPW1K/ma-TZVP levels, respectively. The energy profiles are further refined with the interpolated single-point energies method at the G2M(RCC5)//MPW1K/6-311+G(d,p) level of theory. By the improved canonical variational transition-state theory with the small-curvature tunneling correction (SCT), the rate constants are evaluated over a wide temperature range of 2002000 K. Our calculations have shown that the radical reactivity decreases from CH3CHBr to CH3CBr2. Finally, the total rate constants are fitted by two modified Arrhenius expression. (c) 2012 Wiley Periodicals, Inc.
DOI: --
发表时间: 2010
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发表时间: 1999-02-25
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