化学学报 ›› 1987, Vol. 45 ›› Issue (2): 113-119.    下一篇

研究论文

完全型卤代硼烷的稳定性问题

秦笃捷;江元生   

  1. 吉林大学理论化学研究所
  • 发布日期:1987-02-15

Stabilities of perhalogenated neutral closo-boranes

QIN DUJIE;JIANG YUANSHENG   

  • Published:1987-02-15

对完全型硼烷BnHn^2^-(n=4-12)及其全卤代分子BnCln^2^-作了EH系列的计算.通过能级比较,讨论了卤代硼烷以中性价态稳定存在的原因;根据HOMO-LUMO差,排列了稳定性次序,并由重叠布居计算值,对比了B-B键长数据的变化趋势,估计了未知产物的各类B-B键长.

关键词: 稳定性, 结构与性能关系, 卤代烃, 能级, 电子结构, 硼烷类, 分子轨道理论

EHMO calcns. were made for both closo-borane dianions BnHn2- and their perhalogenides BnXn2-, where n = 4-12, X = Cl, Br. The difference of bonding character between closo-borane dianions and their corresponding perhalogenides are discussed and the effect of perhalogenation on the electronic structure of BnHn2-. The stabilities of the neutral perhalogenated closo-boranes are explained. The order of their stabilities is obtained. The changes of bond lengths from BnHn2- to BnXn are also discussed.

Key words: STABILITY, STRUCTURE AND PROPERTY CORRELATION, HALOHYDROCARBON, ENERGY LEVELS, ELECTRONIC STRUCTURE, BORANES, MOLECULAR ORBITAL THEORY

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