α－，βi－铁钨硅杂多酸盐异构体的合成和性质

Synthesis and Properties of α-and βi-Ferrotungstosilicate Isomers

合成了铁钨硅杂多酸盐的４个异构体（ＴＭＡ）_５［α－，β－ＳｉＦｅ（ＯＨ_２）Ｗ_（１１）Ｏ_（３９）］·ｎＨ_２Ｏ（βｉ中的ｉ＝１，２，３），并测试了它们的ＩＲ、ＵＶ光谱，循环伏安谱和极谱，Ｘ－射线粉末衍射谱。结果表明，β－异构体内的三钨组的旋转和铁的不同位置都影响这些性质。实验得出４种阴离子异构体的氧化序为β_１＞β_３＞α＞β_２，，Ｏ_（ｂ／ｃ）→Ｗ荷移跃迁能顺序为α＞β_２＝β_３＞β_１。

Four isomers of ferrotungstosilicate α-and βi-SiFeW_(11)O_(40)H_2￣(n-) (i=1,2,3) were prepared and their IR, UV. CV, polarography and X-ray powder diffraction behavior were studied. The results show that the rotation of W_3O_(13) in the βi-isomers and the locations of Fe atoms affect these properties. The order of their redox ability is β_1>β_3>α>β_2;the order of transfer energy is α>β_2=β_3>β_1.