含新颖一维金属氧簇阳离子的聚金属氧簇化合物[{M(2,2'-bipy)}_5O_(14)]_4-[2,2'-H_2bipy]_2(As_2W_(18)O_(62))_2·8H_2O(M=Mo,W)的合成、晶体结构与表征  

Synthesis,Crystal Structure and Characterization of a Polyoxometalate Containing a Novel 1D Polycation Chain:{M(2,2'-bipy)}_5O_(14)_4-2,2'-H_2bipy_2(As_2W_(18)O_(62))_2·8H_2O(M=Mo,W)

作　　者：王敬平[1] 王伟[1] 刘迎红[1] 牛景杨[1] 

机构地区：[1]河南大学化学化工学院分子与晶体工程研究所,开封475001

出　　处：《化学学报》2007年第17期1826-1830,共5页Acta Chimica Sinica

基　　金：河南省高校新世纪优秀人才支持计划(No.2005HANCET-02);河南省自然科学基金;河南省优秀青年骨干教师培养计划;河南大学校重点基金资助项目.

摘　　要：以Na2WO4·2H2O,Na2MoO4·2H2O,Na2HAsO4·7H2O和2,2'-bipyridine为原料,在水热条件下制得了含一维阳离子的聚金属氧簇化合物:[{M(2,2'-bipy)}5O14]4[2,2'-H2bipy]2(As2W18O62)2·8H2O(M=Mo/W;2,2'-bipy=2,2'-bipyridyl),并用元素分析,IR,TG和单晶X-ray衍射等手段进行了表征.标题化合物属于单斜晶系,C2/c空间群,a=4.1721(5)nm,b=2.4629(5)nm,c=1.7541(5)nm,β=91.119(3)°,V=18.021(5)nm3,Z=2,R1=0.0629,wR2=0.1605[I>2σ(I)].标题化合物的阳离子链由五元金属氧簇构筑块[{M(2,2'-bipy)}5O14]2+通过氧原子桥联而成,构筑块[{M(2,2'-bipy)}5O14]2+中的五个金属原子呈畸变的"A"字型排布,阳离子展现出新颖的一维锯齿链状结构.A novel polyoxometalate containing a 1-D cation chain [{M（2,2＇-bipy）}5O14]4[2,2＇-H2bipy]2-（As2W18O62）2·8H2O （M=Mo/W; 2,2＇-bipy=2,2＇-bipyridyl） has been synthesized by the hydrothermal reaction of Na2WO4·2H2O, Na2MoO4·2H2O, Na2HAsO4·7H2O and 2,2＇-bipyridyl, and characterized by elemental analyses, IR, TG and single-crystal X-ray diffraction. The title compound is monoclinic with a C2/c space group, a=4.1721（5） nm, b=2.4629（5） nm, c=1.7541（5） nm, β=91.119（3）°, V=18.021（5） nm^3, Z=2, R1=0.0629, wR2=0.1605 [I〉2σ（I）]. The cation chain in the title compound is built up from the quintuple polyoxometalate unit [ { M（2,2＇-bipy）} 5O14]^2＋, in which five metal atoms exhibit the distorted ＂A＂ configuration, and each [{ M（2,2＇-bipy）}5O14]^2＋ unit is connected to adjacent blocks by bridging-oxygen atoms. The 1-D cation chain shows the zigzag structure.

关 键 词：聚金属氧簇化合物 晶体结构 水热合成 DAWSON结构 

分 类 号：O611.3[理学—无机化学]