高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (8): 1285.

• 论文 • 上一篇    下一篇

杂氮硅三环类化合物的紫外光电子能谱及化学键的理论研究

孙政1, 郑世钧1, 孟令鹏1, 王殿勋2   

  1. 1. 河北师范大学化学系, 石家庄 050091;
    2. 中国科学院化学研究所, 分子动态和稳态结构国家重点实验室, 北京 100080
  • 收稿日期:1998-07-13 出版日期:1999-08-24 发布日期:1999-08-24
  • 通讯作者: 郑世钧
  • 作者简介:孙政,男,26岁,硕士.
  • 基金资助:

    河北省自然科学基金(批准号:298171)资助

Ultraviolet Photoelectron Spectrum and Bonding Studies on the Silatranes: Experimental and Theoretical Studies

SUN Zheng1, ZHENG Shi-Jun1, MENG Ling-Peng1, WANG Dian-Xun2   

  1. 1. Department of Chemistry, Hebei Teachers University, Shijiazhuang 050091, China;
    2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:1998-07-13 Online:1999-08-24 Published:1999-08-24

摘要: 报道了10种杂氮硅三环类化合物的紫外光电子能谱(UPS).采用RHF/3-21G*对各化合物进行了构型优化.根据各化合物UPS的谱带特征结合RHF/6-31G*的计算结果对谱图进行了合理的解析和指认.利用6-31G*基组进行的电子密度拓扑分析表明,各化合物的N和Si原子间均存在键鞍点,从理论上证实了N和Si原子间存在成键作用.各化合物的UPS和SCFMO计算和电子密度拓扑分析都表明,在该类体系中σN→Si配键是比杂氮硼三环类化合物中σN→B配键弱得多的成键作用;文中同时讨论了不同取代基对Si和N间成键作用的影响.

关键词: 杂氮硅三环类化合物, 紫外光电子能谱, 从头算, 化学键, 电子密度拓扑分析

Abstract: The Ultraviolet Photoelectron Spectra(UPS) of 10 silatranes are recorded in this paper. The configurations of ten molecules are optimized at RHF/3-21Glevel. The assignment of the UPSbands has also been done with the aid of the bands shape and RHF/6-31G* calculation. The electronic charge density topological analysis of the compounds shows that there is a bond critical point between Si and Nof each compound, which suggests the existence of a Si-N bond in these compounds. The σN→Si in the silatranes is weaker than σN→B in the boratranes, and the bond strength of σN→Si is affected with the addition of the substituents at Si atoms. Aspecial substituent effect is also found as the substituents are F, Cl, Br and I. The above substitution effect is confirmed by UPS, SCF MO calculation and electronic charge density topological analysis.

Key words: Silatranes, UPS, Ab initio, Chemical bond, Electron density topological analysis

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