新型取代缺位钨杂多酸盐的合成与结构  

Synthesis and Structure of a Substituted Lacunary Polytungstosilicate

作　　者：林曦[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2005年第1期70-74,共5页Journal of Fujian Normal University：Natural Science Edition

摘　　要：标题化合物K4[H3+xSiCoxW12-xO40]·16H2O(x=0.75)是由硝酸钴Co(NO3)2与β-11-钨硅杂多酸盐β-K8[SiW11O39]反应制得的.其晶体属于四方晶系,空间群为P4n2,晶胞参数:a=b=1.412(2)nm,c=1.2384(3)nm,α=β=γ=90(°),V=2.4692(8)nm,Dc=4.343g·cm-3,Z=2.X-射线单晶结构分析表明,其晶体是由具有硅氧四面体SiO4为中心,具有D2d对称性的阴离子[H3+xSiCoxW12-xO40]4-、阳离子K+以及水分子堆积而成三维结构;其中Co2+统计地取代了β-11-钨硅杂多酸盐的空位,不同于熟知的α-、β-或γ-型单空位取代杂多酸盐结构的形成过程也作了讨论.The title complex was prepared by the reaction of cobalt (Ⅱ) nitrate with β isomer of 11-tungstosilicates, and its crystals is tetragonal, space group P4n2 with a=b=1.412(2) nm,c=1.2384(3) nm,α=β=γ=90(°),V=2.4692(8) nm^3,D_c=4.343 g·cm^(-3),Z=2.The crystal consists of the ^( 4-) (x=0.75) ion with D_(2d) symmetry, having a SiO_4 tetrahedron in the center, bound by K^+ and water molecules to form a three dimensional framework is showed the statistical substituting nature of monovacant heteropolyanion with Co^(2+).The formation of substituting tungstosilicate derived from the monovacant precursor, which differs from α-, β- or γ-type, will also be discussed.

关 键 词：杂多化合物 取代硅钨酸盐 晶体结构 

分 类 号：O626[理学—有机化学]