ClO/ClO^-耦合体系结构性质及反应通道研究  

Studies on Structural Properties and Reaction Pathways of ClO/ClO^- Coupling System

作　　者：颜世海[1] 步宇翔[1] 韩克利[2] 

机构地区：[1]曲阜师范大学化学系,曲阜273165 [2]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《化学学报》2002年第11期1986-1992,共7页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 9973 0 2 2 );国家重大基础研究发展规划项目;教育部骨干教师计划项目资助课题

摘　　要：利用从头算法和密度泛函理论对ClO/ClO-体系进行了研究 .首先应用密度泛函理论的六种方法 (B3LYP ,BLYP ,B3P86 ,BP86 ,BHLYP ,LSDA)和从头算理论的CCSD方法在 6 31+G ,6 311+G 及 6 311+G(3df)基组水平上对单体进行了优化 ,选出最适合该体系的方法和基组B3LYP/6 311+G(3df) ;然后在B3LYP/6 311+G(3df)水平上计算了沿各种反应通道的离解能 ,并且进行了校正 .找出了存在的中间体及中间体异构化的过渡态 ,并进行了IRC路径解析 .对各稳定体进行了频率分析和成键分析 .结果表明 ,单体ClO和单体ClO-结合为稳定的中间体后 ,其离解方式主要是向着ClOO +Cl-和ClOO-+Cl两种方式进行 ,两种离解方式的离解能分别为 - 33 39和 82 88kJ/mol,并且前者是一个离解性电子转移过程 ,经历一个电子转移过渡态 .On the basis of ab initio and DFT theory, the ClO/ClO- coupling system has been studied. The equilibrium geometries and harmonic frequencies of ClO/ClO- system have been determined at B3LYP, B3P86, BLYP, BP86, BHLYP, LSDA, CCSD levels using different basis sets with diffuse and d, f polarization functions. Comparison with available experimental results is also made. The dissociation energies have been calculated using B3LYP method employing the 6-311 + G (3df) basis set, and have also been corrected using the BSSE method. The intermediates and the transition state of the isomerization reaction have been found, and the bonding analysis has also been made. The results show that the main products are C100 + Cl- and ClOO- + Cl for the dissociation of two coupling system. The dissociation energies for the corresponding dissociation channels are - 33.39 and 82.88 kJ/mol, respectively. It should be noted that the dissociation to C100 + Cl- is essentially a dissociative electron transfer process with an electron transfer transition state.

关 键 词：结构 性质 反应通道 密度泛函理论 ClO/ClO^-体系 反应机理 过渡态 大气化学 氯氧化物 从头算 量子化学 

分 类 号：O641[理学—物理化学]