一种新型钼钒多酸化合物的合成、结构与荧光性能

采用水热技术,合成了一种新型四帽Keggin结构多酸化合物H₃Mo₈^ⅥV₈^ⅣO₄₀(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。

Synthesis,Structure Characterization and Photoluminescence Property of a New Molybdenum-Vanadium Polyoxometalate

A new tetra-capped Keggin molybdenum-vanadium polyoxometalate H₃Mo₈^ⅥV₈^ⅣO₄₀(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.