新型硅钨酸盐的水热法合成、结构表征和磁性

Hydrothermal Synthesis,Structure and Magnetism of a New Tungstosilicates Polyoxometalate

用水热方法合成了新型的硅钨杂多氧酸盐(C2H10N2)3(SiW12O40).3H2O,用元素分析、IR和单晶X射线衍射分析技术对化合物的分子和晶体结构进行了表征。结果表明,该化合物的晶体属于三斜晶系,P-1空间群,a=1.3193(3)nm,b=1.3198(3)nm,c=1.3193(3)nm,α=76.05(3)°,β=76.13(3)°,γ=76.05(3)°,V=2.1231(7)nm3,Z=1,R1=0.0518,wR2=0.1355。化合物分子由一个α-Keggin结构的硅钨多金属簇阴离子、3个乙二胺分子作为平衡阳离子和3个结晶水分子组成,簇阴离子的端氧与乙二胺阴离子及结晶水分子之间的多种类型的氢键连接形成三维超分子结构。化合物磁性测量表明,其分子内存在反铁磁性相互作用。

A new tungstosilicates polyoxometalate （ C： H10 N2 ） 3 （ siwV W10 040 ） 3H2O was prepared under hydrothermal conditions, and characterized by elemental analysis, IR and single crystal X-ray diffraction analysis. The title compound crystallized in a triclinic system, P-1 space group, a = 1. 3193（3） nm, b = 1.3198（3） nm, c=1.3193（3） nm, a=76.05（3）°, β=76. 13（3）°, T=76.05（3）°, V=2.1231（7） nm3, Z = 1, R1 = 0. 0518, wR2 = 0. 1355. The title compound is comprised of silica tungsten Keggin polyoxoanion, three ethylenediamine and water molecules. The hydrogen bonds among polyoxoanion, ethylenediamine and water molecules are responsible for the formation of its extended three dimensional structure. Magnetic measurement indicates that there exists antiferromagnetic interaction in the molecule.