一种新型钼钒多酸化合物的合成、结构与荧光性能

摘要

采用水热技术,合成了一种新型四帽Keggin结构多酸化合物[H3MoⅥ8VⅣ8O40(AsO4)](en)2(4,4-bipy)7·9H2O(en:乙二胺;bipy:联吡啶)(1),并对化合物进行了元素分析、红外光谱、X射线光电子能谱和X射线单晶结构分析.晶体结构分析表明,化合物属三斜晶系,P1 空间群,晶胞参数a＝1.47395(5)nm,b＝1.48172(6)nm,c＝1.62881(7)nm,α＝66.16(3)°,β＝87.15(2)°,γ＝63.42(1)°,V＝2.8723(2)nm3,Z＝1,R1＝0.0728,wR2＝0.2014.化合物由四帽Keggin多酸阴离子、4,4′-联吡啶、乙二胺和结晶水分子构成,化合物分子间存在大量的氢键,使化合物1形成3-D超分子结构.荧光测试表明,化合物1能发出较强的荧光,有可能成为潜在的光活性材料.%A new tetra-capped Keggin molybdenum-vanadium polyoxometalate [ H3MoⅥ8VⅣ8O40(AsO4)](en)2(4,4-bipy)7·9H2O(en:ethylenediamine,bipy:bipyridine)(1)was prepared under hydrothermal conditions,and characterized by elemental analysis,FT-IR,X-ray photoelectron spectroscopy(XPS)and single crystal X-ray diffraction analysis.The title compound crystallized in a triclinic system,P1 space group,a＝1.47395(5)nm,b＝1.48172(6)nm,c＝1.62881(7)nm,α＝66.16(3)°,β＝87.15(2)°,γ＝63.42(1)°,V＝2.8723(2)nm3,Z＝1,R1＝0.0728,wR2＝0.2014.Compound 1 is composed of a tetra-capped Keggin polyoxoanion,4,4′-bipyridine,ethylenediamines and lattice water molecules.The rich hydrogen bonds among polyoxoanion and water molecules make the compound molecules forming three dimensional supramolecular array.The compound 1 exhibits strong fluorescent emission and may be an excellent candidate for potential photoactive materials.