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CH_3SH+CN微观反应机理的理论研究 被引量:4

Theoretical study on the reaction mechanism of CH_3SH+CN
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摘要 采用BMC-CCSD//B3LYP/6-311G(d,p)方法对CH3SH+CN反应机理进行了详细的理论研究.反应中涉及的各稳定点的构型、振动频率和零点能在B3LYP/6-311G(d,p)水平下计算得到,计算结果表明,该反应存在两种反应机理,5条可能的反应通道.SN2机理由于能垒太高,与直接氢抽提机理相比可以忽略.该反应的最可行通道为CN中的C原子进攻SH中的H原子经由一个前期和一个后期分子络合物生成产物CH3S和HCN.计算得到的反应焓变与已有实验值非常吻合. A detailed theoretical survey on the potential energy surface for the CN+ CH3SH reaction is carried out at the BMC-CCSD//B3LYP/6-311G(d,p) level.The geometries,vibrational frequencies,and energies of all stationary points involved in the reaction are calculated at the B3LYP/6-311G(d,p) level.The results suggest that there are two different mechanisms and five pathways in the title reaction.SN2 substitution reactions are less favourable than the direct H-abstraction reactions kinetically and thermodynamically.The dominant channel is the C atom in CN attacking H atom in SH group to form HCN and CH3S with a pre-reaction complex and a post-reaction complex involved.The calculated reaction enthalpies are in reasonable agreement with the available experimental data.
作者 边江鱼
出处 《分子科学学报》 CAS CSCD 北大核心 2009年第5期338-342,共5页 Journal of Molecular Science
基金 东北师范大学自然科学青年基金资助项目(20070311)
关键词 CH3SH CN 密度泛函理论 反应机理 CH3SH CN density functional theory reaction mechanism
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