芳香性
离域电子
密度泛函理论
化学
结晶学
电子结构
离子
化学键
计算化学
分子
有机化学
作者
Zhiwei Li,Cunyuan Zhao,Liuping Chen
出处
期刊:Journal of Molecular Structure-theochem
[Elsevier]
日期:2008-04-01
卷期号:854 (1-3): 46-53
被引量:13
标识
DOI:10.1016/j.theochem.2007.12.032
摘要
The equilibrium geometries, electronic structures, harmonic vibrational frequencies, and nucleus independent chemical shifts (NICS) of Bi5-, Bi5M (M = Li, Na, K), and Bi5M+ (M = Be, Mg, Ca) clusters are calculated by the density functional theory (DFT) method. Our calculation show that the ground states of Bi5-, Bi5M, and Bi5M+ species are predicted to be the D5h, C5v, and C5v structures, respectively. In addition, the Bi5- unit preserves its structural and electronic integrity in forming the Bi5M and Bi5M+ complexes. Molecular orbital analysis and NICS show that the planar Bi5- (D5h) anion satisfies the Hükcel rule of 4n + 2 π electrons and magnetic criteria for aromaticity with six delocalized π electrons and negative NICS values. The dissected NICS suggests that the aromaticity of Bi5- (D5h) arise primarily from the contributions of Bi–Bi σ bonds and Bi–Bi π bonds, while the aromaticity of Bi5M and Bi5M+ mainly owe to the Bi–Bi σ bonds.
科研通智能强力驱动
Strongly Powered by AbleSci AI