基于Keggin结构杂多酸的有机-无机杂化稀土化合物的合成和晶体结构研究

Synthesis and Crystal Structure of Organic-inorganic Hybrid Rare Earth Compound Based on Keggin-type Polyoxotungstates

通过水热合成方法得到了一种结构新颖的基于Keggin结构支撑型杂多酸有机-无机杂化稀土化合物Sm(DMF)7PW12O40,并通过X-射线单晶衍射测定了该化合物的晶体结构。结构分析显示,化合物中每1个Sm原子分别和7个来自DMF分子中的氧原子以及1个来自[PW12O40]3-阴离子中的桥连氧原子相配位,形成了八配位的扭曲的四方反棱柱体几何构型。在晶胞中,存在着丰富的C—H…O分子内及分子间作用力,这些作用力将分子连接成三维网络结构,使整个晶体结构趋于稳定。

The title compound,Sm（DMF）7PW12O40,was synthesized by hydrothermal method.Its crystal structure was determined by X-ray diffraction.It reveals that each Sm atom displays a distorted square antiprismatic geometry with coordinated by seven oxygen atoms of DMF molecules and one bridge oxygen atom of Keggin-type polyoxotungstates.In the lattice,there exists C—H…O intra-and intermolecular interactions which link molecules to form 3D network and stabilize the whole structure.