[具有Keggin结构的多组分杂多化合物的合成与光谱研究。II]

[The synthesis and spectral study of multicomponent heteropoly compounds with Keggin structure. II].

作者信息

Lin Zhi-hua, Zhang Han-hui, Guo Chun-hua, Huang Chang-cang, Sun Rui-qing

机构信息

Institute of Structural Chemistry, Fuzhou University, Fuzhou 350002, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Oct;22(5):752-4.

PMID:12938420

Abstract

The multicomponent heteropoly compounds [Me4N]4 + x[SiVxMoyW12 - x - yO40].n H2O with Keggin structure have been synthesized and characterized by FTIR. The vibrational frequencies of containing-oxygen bonds (Si-Oa,M=Od, M-Ob-M and M-Oc-M) in these heteropoly compounds have been studied. The vibrational frequencies nu as(M=Od) and nu as(M-Ob-M) are demonstrated to explain why the acidity of the heteropoly compounds becomes weaker and the oxidative ability becomes stronger when W atoms are substituted by V atoms. The rule of the change is similar with [PVxMoyW12 - x - yO40](3 + x)-. In addition, the acidity of P series is stronger than the acidity of the corresponding Si series.

摘要

合成了具有Keggin结构的多组分杂多化合物[Me4N]4 + x[SiVxMoyW12 - x - yO40].n H2O，并通过傅里叶变换红外光谱（FTIR）对其进行了表征。研究了这些杂多化合物中含氧化合物键（Si-Oa、M=Od、M-Ob-M和M-Oc-M）的振动频率。通过振动频率νas(M=Od)和νas(M-Ob-M)解释了V原子取代W原子时杂多化合物酸度变弱、氧化能力变强的原因。这种变化规律与[PVxMoyW12 - x - yO40](3 + x)-相似。此外，P系列的酸度比相应Si系列的酸度更强。