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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (8): 1165-1170. 上一篇    下一篇

研究论文

Keggin杂多阴离子电子结构和物化性质与中心原子的 关系

肖慎修;杨胜勇;陈天朗;王荣顺   

  1. 四川大学化学学院
  • 发布日期:2001-08-15

Relationships of electronic structures and physico- chemical properties of keggin anions on central atoms

Xiao Shenxiu;Yang Shengyong;Chen Tianlang;Wang Rongshun   

  • Published:2001-08-15

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被引次数

49 | 8

使用密度泛函理论中的离散变分方法(DFT-DVM)，以(XMo12O40)^n-(X=B,Al,Si,Ge,P,As,S)为例计算了七个Keggin杂多阴离子的电子结构，讨论了中心原子对Keggin阴离子的电子结构、稳定性、氧化还原性和酸性关系。根据计算结果，给出稳定性、氧化还原性强弱顺序，计算给出结果与实验一致。

关键词: 杂多阴离子, KEGGIN结构, 电子结构, 稳定性, 氧化还原性, 杂多酸, 中心原子, 离散变分方法, 密度函数

The electronic structures of Keggin-type heteropolyanions (XMo12O40) ^-(X=B, Al, Si, Ge, P, As, S) have been calculated by the Density Functional Theory coupled with Discrete Variational Method(DFT-DVM). Based on the calculated results of the seven heteropolym anions, we discussed the influence of the central atoms on the electronic structure, stability, oxidizability and acidity. These results give the sequences of (1) stability, (2) acidity and (3) oxidizability of seven heteropoly anions respectively, as follows: (1) (SMo12O40)^2-> (AsMo12O40)^3>(PMo12O40)^3- (GeMo12O40)^4(BMo12O40)^5-(SiMo12O40)^4 (AlMo12O40)^5-; (2) H2SMo12O40>H3AsMO12O40>H3PMo12O40> H4 GeMo12O40>H4 SiO12O40>H5 AlMo12O40>H5BMo12O40; (3)(SMo12O40)^2-> (AsMo12O40)^3->(PMo12O40)^3-> (GeMo12O40)^4->(SiMo12O4)^4->(AlMo12O40) ^5-> (BMo12O40)^5-. These sequences are strongly supported by many experimental results.

Key words: ELECTRONIC STRUCTURE, STABILITY, HETEROPOLYACID

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