有机化学 ›› 1994, Vol. 14 ›› Issue (2): 142-148. 上一篇    下一篇

研究论文

烷基锂分子中化学键的 ab initio 研究

刘元隆;钮泽富;潘道皑   

  1. 华东师范大学化学系
  • 发布日期:1994-04-25

An ab initio study on the chemical bonds in alkyllithium molecules

LIU YUANLONG;NIU ZEFU;PAN DAOAI   

  • Published:1994-04-25

本文用6-13G基函对3-12G基优化构型进行单点ab initio (从头计算法) 计算, 并根据轨道的组合系数、电荷密度图和键强参数等详尽地分析了烷基锂分子的成键情况。烷基锂的易挥发、易聚合、聚合物易溶于烃类溶剂中等物理、化学性质主要是其C-Li键具有显著的共价性缘故。由于烷基锂的C-Li键比C-H和C-C键的强度要小,故C-Li键易于断裂,使烷基锂表现有高的化学反应活性。

关键词: 化学键, 从头计算法, 华东师范大学科研基金资助课题, 烷基锂, 中国科学院计算机化学开放实验室资助课题

Single point 'ab initio' calculations of alkyllithium molecules using 6-13G basis set are performed at the 3-21G optimized structures. From the obtained eigenvectors, electron density contour maps and BSP's of individual valence MO's, one may conclude that in these molecules the C-Li bond has obvious covalent nature. Its BSP is less than that of C-----H or C-----C. Many properties of alkyllithiums may be explained by these results.

Key words: AB INITIO CALCULATION, LITHIUM ALKYLIDE, CHEMICAL BONDS

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