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取代型杂多化合物可改变多酸化合物的酸碱性、氧化还原性和热稳定性，因而受到关注［1]．夹心型化合物是一类新型化合物，具有大的摩尔质量，高的负电荷，且含有多个磁性中心，近年来已引起国内外的兴趣[2]．已见报道的以磷为杂原子的夹心型化合物有［M4（H2O）2（PW9O34）2］10-（M=Cu1，Co1，Mn1，Ni1，Zn1）[3]和〔M4（H2O）2（P2W15O56）2]16－（M＝Cu1，Co1，Mn1，Ni1，Zn1）［4]系列，它们具有如磁性[5]、催化活性[6]和抗病毒活性[7]等性质．近来我们合成了以砷为杂原子的4：3O系列夹心型化合物［M4（H2O）2（As2W15O56）]16－（M=Cu1，Co1，Mn1，Ni1，Zn1，Cd1），并系统地讨论了结构
Substituted heteropoly compounds can change the acid-base, redox and thermal stability of polyacid compounds, which attracted attention [1]. Sandwich-type compounds are a new class of compounds with large molar mass, high negative charges and multiple magnetic centers. In recent years, they have attracted more and more interest both at home and abroad [2]. It has been reported that the sandwich type compounds containing phosphorus as a hetero atom are [M4 (H2O) 2 (PW9O34) 2] 10- (M = Cu1, Co1, Mn1, Ni1, Zn1) [3] and [M4 (P2W15O56) 2] 16- (M = Cu1, Co1, Mn1, Ni1, Zn1) [4] series have some properties such as magnetism [5], catalytic activity [6] and antiviral activity [7]. Recently, we have synthesized 16: (M = Cu1, Co1, Mn1, Ni1, Zn1, Cd1) 4: 3O series sandwich compounds with arsenic as a heteroatom [M4 (H2O) 2 (As2W15O56)] and systematically discussed structure