高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (4): 506.

• 论文 • 上一篇    下一篇

卤化铈的化学键性质

王义   

  1. 北京大学化学系, 北京, 100871
  • 收稿日期:1991-04-08 出版日期:1992-04-24 发布日期:1992-04-24

The Bond Properties of Cerium Halide

WANG Yi   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1991-04-08 Online:1992-04-24 Published:1992-04-24

摘要: 结合Ziegler的过渡态方法和Xα-SW方法,从能量上分析了CeF4、CeF3、CeCl3、CeBr3的离子键和共价键性质。结果表明,Ce-X(X为卤素)共价键主要由Ce的5d和4f轨道与卤素构成;未成对电子基本分布在Ce的4f轨道上;在成对占据的轨道中有一定程度的Ce4f成分,对Ce-X共价键有相当程度的贡献;CeF3中离子键起主要作用,其它化合中离子键的程度与共价键接近。

关键词: 卤化铈, 化学键, X&alpha, -SW

Abstract: With the aid of Ziegler' s transition state method and the improved Xa-SWmethod, the bond properties of cerium halide are analyzed energetically.The result shows that, the cova-lent bond of Ce-X(Xrepresents halogen) is mainly due to the 5d and 4f orbitals of cerium) The spin unpairedly occupied molecular orbital is primarily composed of the 4f orbital of cerium; Some of the spin pairedly occupied molecular orbitals are formed by the considerable mixture of the 4f orbital of cerium and the orbitals of halogen; The action of ionic bond is principal for CeF3, however, the action of ionic bond is not evidently different from that of covalent bond for the other halides.

Key words: Cerium halide, Chemical bond, Xa-SW

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