Theoretical Studies on MXO4 (M=Li, Na, K and X=F, Cl, Br, I) Salt Ion Pairs

Bulletin of the Korean chemical society

Manik Kumer Ghosh¹  Mohammad Harun Or Rashid¹  Cheol Ho Choi¹ 

关键词: Bidentate;    Tridentate;    Ion pair;    Alkali metal perhalogenate;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The series of alkali metal perhalogenates, MXO4 (M=Li, Na, K and X=F, Cl, Br, I) were theoretically studied with the help of MP2 methods. Bidentate as well as tridentate structures were found to be stable minima. The bidentate structures are becoming preferred as the size of halogen increases and as the size of metal decreases. Geometrically, the M-O and M-X distances of both bidentate and tridentate structures, increase with the size of metal. Generally, the M-O1 distances of tridentate forms are longer than the corresponding distances of bidentate forms, while the M-X distances of tridentate forms show the opposite trend. Similarly, the X-O bonds increase with the size of halogens except MFO4 pairs, where the X-O bonds are unusually long due to the enhanced oxygen-oxygen repulsions. In short, the relative energetics as well as the geometrical parameters are found to be strongly dependent on halogen and metal elements.

【 授权许可】

Unknown