内含式化合物X@B_(12)P_(12)的结构与稳定性研究  

Structure and Stability of Endohedral Complexes X@B_(12)P_(12)

作　　者：武海顺[1] 张竹霞[1] 

机构地区：[1]山西师范大学材料化学研究所,临汾041004

出　　处：《物理化学学报》2005年第5期479-484,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20341005)资助项目~~

摘　　要：采用B3LYP/6-31G*方法,对内含式化合物X@B12P12(X=Li0/+、Na0/+、K0/+、Be0/2+、Mg0/2+、Ca0/2+、H和He)的不同对称性构型进行了计算,讨论其最稳定构型的几何参数、布居分析、偶极矩、电离势、包含能、振动频率、能隙和自旋密度.发现在X@B12P12化合物中,客体X=Li、Na0/+、K0/+、Mg0/2+、Ca0/2+和He处在偏离笼的中心0.006nm的半径内.Be2+沿着C3轴偏离中心点0.279nm.在Be@B12P12和H@B12P12的基态结构中,Be和H与笼上的B原子成键.除Li@B12P12、Be2+@B12P12和He@B12P12外,其余结构为Cs对称稳定构型.All structures of X@B12P12 (X=Li0/+,Na0/+,K0/+,Be0/2+,Mg0/2+,Ca0/2+,H and He) are optimized at the B3LYP/6-31G* density functional level of theory, and the corresponding frequency calculations at the same level are used to characterize the optimized structures with energy minima without imaginary frequencies, The geometries, natural bond orbitals (NBO), dipole moments, adiabatic ionization potentials, inclusion energies, vibrational frequencies, energy gaps and spin densities are also discussed. The calculations predict that X= Li, Na0/+, K0/+, Mg0/2+,Ca0/2+ and He are in the vicinity of 0.006 nm of the cage center, and Be2+ is displaced by 0.279 nm from the cage center along the threefold axis of B12P12. Be@B12P12 and H@B12P12 have endohedral Be-B and H-B bonds respectively. Except for Li@B12P12, Be2+@B12P12, and He@)B12P12, all conformations favor C-s symmetry.

关 键 词：内含式化合物 偶极矩 包含能 能隙 自旋密度 

分 类 号：O611[理学—无机化学]