一例含有八核钴簇的锗钨酸盐的合成、结构及性质

Synthesis,Structure and Properties of a Germanotungstate Containing an Octanuclear Cobalt(Ⅱ)Cluster

以K8Na2[A-α-Ge W9O34]·25H2O,Co(NO3)2·6H2O和K2CO3等为原料,利用常规水溶液法合成了一例基于三缺位Keggin型多金属氧簇{Ge W9O34}的高核过渡金属衍生物K10.5Cs4H1.5{[Co8(OH)6(H2O)2](CO3)3(Ge W9O34)2}·12H2O(1),并通过红外光谱、元素分析、热重分析和X射线单晶衍射等分析手段对其进行了表征。化合物1含有一个V型的多酸阴离子簇{[Co8(OH)6(H2O)2](CO3)3(Ge W9O34)2}16-,该阴离子进一步通过K+和Cs+离子连接形成二维结构。磁学性质研究表明,化合物1中Co2+离子之间主要为反铁磁性耦合。

A high-nuclearity transition metal derivative based on the trivacant Keggin-type polyoxotungstate{GeW9O34},K10.5Cs4H1.5{[Co8(OH)6(H2O)2](CO3)3(GeW9O34)2}·12H2O(1),has been successfully synthesized by the reaction of K8Na2[A-α-Ge W9O34]·25H2O,Co(NO3)2·6H2O and K2CO3in a conventional aqueous solution method.It was structurally characterized by elemental analysis,IR spectrum,TG analysis and X-ray single crystal diffraction,etc.The results show that compound 1 contains a V-type polyoxoanion{[Co8(OH)6(H2O)2](CO3)3(Ge W9O34)2}16-,and further forms a two-dimensional structure through K+and Cs+connections.In addition,magnetic properties show that compound 1 mainly represents the antiferromagnetic exchange interactions among Co2+centers.CCDC:1996627.