杂多酸盐K_4H(SiMo_(11)VO_(40))·14H_2O的合成及晶体结构

SYNTHESIS AND CRYSTAL STRUCTURE OF K_4H(SiMo_(11)VO_(40))·14H_2O

杂多酸是种类多,应用广的重要的无机化合物。其中有一类是12-系列化合物Z,(XM_(12-n)M_n′O_(40))·mH_2O,中心离子X可以是过渡元素或非过渡元素;M常是Mo、W;M′为V_(5+)、Mn_(2+)、CO_(2+)等;n=0,1,2…;Z为H^+或一价阳离子;y=1,2,…。它们同其相应氧化型化合物比较具有引人注目的特性,但迄今尚未见到还原型化合物晶体结构文章。

The crystal structure of the title compound was determined by single crystal X-raydiffractometny at - 90℃. It crystallizes in tetragonal space group P42_1c, with Z = 2,a =12.540(2), c = 17. 565(5)A. The structure was solved by direct and Fourier techniques andrefined by least-squares to R = 0. 064 for 1737 reflections. Si ion is 4-coordinated, beingbonded to four oxygen atoms, Si-O = 1. 595(11) A Three M (Mo and V)are coordinated tosix Oatoms to form octahedron. M-O distances are in the range of 1.82-2.38A and K atombeing coordinatred with seven O atoms, forms a monocapped trigonal prism. The K-Odistances are in the range of 2. 83-3.11 A.