HNCS与Cl原子的反应机理及电子密度拓扑分析  

Reaction Mechanism and Topological Analysis of Electronic Density for the Reaction of HNCS with Cl

作　　者：魏青[1,2] 许保恩[1,2] 孙翠红[1,2] 李晓艳[1] 孟令鹏[1] 任蕾[2] 

机构地区：[1]河北师范大学计算量子化学研究所,石家庄050016 [2]石家庄学院化工学院,石家庄050035

出　　处：《物理化学学报》2009年第8期1623-1628,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20771033;20801017);河北省自然科学基金(B2008000141;B2008000138);河北省教育厅基金(2007123)资助项目~~

摘　　要：在QCISD(T)/6-311++G(d,p)和B3LYP/6-311++G(d,p)级别上研究了HNCS与Cl原子的反应机理.并应用经典过渡态理论和正则变分过渡态理论结合小曲率隧道效应,计算了200-2500K温度范围内各反应通道的速率常数.结果表明,HNCS与Cl原子反应存在3个反应通道.当温度低于294K时,生成HCl+NCS的夺氢反应(a)是优势通道,温度高于294K时,生成HNC(Cl)S的加成反应(c)为主反应通道,Cl进攻N的反应通道(b)因能垒较高而难以进行.The reaction mechanism of HNCS with Cl was investigated at the QCISD（T）/6-311＋＋G（d,p） and B3LYP/6-311＋＋G（d,p） levels of theory. Reaction rate constants were calculated over a temperature range of 200-2500 K using classical transition state theory and canonical variational transition state theory combined with a small-curvature tunneling correction. Results show that there are three reaction channels for the HNCS＋Cl reaction. At temperatures lower than 294 K, hydrogen abstraction reaction （a） is the major channel and HCI＋NCS are the main products, while addition reaction （c） is the major reaction process and HNC（Cl）S is the dominant product at temperatures higher than 294 K. Reaction channel （b）, where Cl atom attacks N atom, is a difficult process because of the higher energy barrier.

关 键 词：反应机理 异硫氰酸 速率常数 电子密度拓扑分析 

分 类 号：O643.12[理学—物理化学]