化学学报 ›› 2003, Vol. 61 ›› Issue (8): 1213-1219. 上一篇    下一篇

研究论文

F+CH_3OH碰撞反应机机理和反应势能面

陈德展;杨仲年;王道平;孟琳   

  1. 山东师范大学化学系
  • 发布日期:2003-08-15

Reaction Mechanism and the Potential Engergy Surface of F+CH_3OH

Chen Dezhan;Yang Zhongnian;Wang Daoping;Meng Lin   

  1. Department of Chemistry, Shandong Normal University
  • Published:2003-08-15

以MP2(full)/6-311 + +g(d,p)水平上详细研究了氟原子与甲醇抽氢反应的 多通道反应机理,得到了各条通道中涉及的驻点的构型和振动频率及其能量,给出 了两张完整的反应势能面,结果表明,氟原子从C原子上抽氢时有一条明显的最低 能量通道,而从氧原子上抽氢时要涉及多条分支通道和多个驻点构型,给出了各分 支通道势能面示意图,结果表明以形成五元环状过渡态通道为优势通道,计算得到 经途径1生成CH_2OH时反应放热170.62kJ/mol,经分支途径6生成CH_3O自由基时反 应放热119.4 kJ/mol,此结果与实验值一致。

关键词: 氟原子, 甲醇, 势能面, 反应机理, 碰撞, 过渡态理论, 自由基反应

Multiple-paths hydrogen abstraction reactions of fluorine -with CH_3OH have been investigated at the MP2 (full)/6-311 + + g(d, p) level. The potential energy surfaces (PES) for H-abstraction reaction from carbon atom and oxygen atom were given respectively. The results indicate that there is only one minimum energy path for hydrogen abstraction from carbon atom, while multiple paths were found for hydrogen abstraction from oxygen atom. All the stationary structures, frequencies as well as PES sketch of all channels were given, in which the dominant channel is by a five-member ring transition state. The calculated heat of reaction is 170.62 kj/mol for channel 1, 119.41 kJ/ mol for branch channel 6. The results are in good agreement with experimental data.

Key words: FLUORINE, METHANOL, POTENTIAL ENERGY SURFACES, REACTION MECHANISM, COLLISON, TRANSITION STATE THEORY, FREE RADICAL REACTION

中图分类号: