高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (6): 801.

• 论文 • 上一篇    下一篇

亚烷基卡宾与亚烷基锂氟类卡宾化学键结构的量子拓扑研究

孟令鹏, 蔡新华, 郑世钧   

  1. 河北师范学院化学系, 石家庄, 050091
  • 收稿日期:1991-06-04 出版日期:1992-06-24 发布日期:1992-06-24
  • 通讯作者: 郑世钧

Quantum Topological Study on the Structure of Chemical Bonds in Alkylidenecarbene and Lithio-Fluoro-Carbenoid

MENG Ling-peng, CAI Xin-hua, ZHENG Shi-jun   

  1. Department of Chemistry, Hebei Teacher's College, Shijiazhuang, 050091
  • Received:1991-06-04 Online:1992-06-24 Published:1992-06-24

摘要: 用abinitio(3-21G)方法对亚烷基卡宾H2C—C的单线态及三线态结构进行了电子密度拓扑分析,说明了它们的亲电、亲核反应方向,讨论了亚烷基锂氟类卡宾H2C—CLiF的4种构型,论证了该分子中不存在四元环结构、Li—C键以静电作用为主的特性,并预测了加成反应机理。

关键词: 卡宾, 化学键, 量子拓扑

Abstract: The structure and properties of singlet and triplet alkylidenecarbene, H2C=C , were studied with topological analysis of electronic charge density at ab initio(3-21G) level.The orientations of electrophilic and nucleophilic reactions can be explained on this basis.As for lithio-fluo-ro-carbenoid, H2C=CLiF, four equilibrium geometries were studied.The results show that in carbenoid species, Li and Hatoms did not form a chemical bond, there is no four-membered-ring in the molecule, and electrostatic interaction is dominant in Li-C bond.The mechanism for addition reaction of carbenoid would be predicted.

Key words: Carbene, Chemical bond, Quantum topology

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