一种双钒帽多金属氧酸盐的水热合成及其晶体结构和热稳定性

Hydrothermal synthesis of a bivanadyl capped polyoxometalate and its crystal structure and thermal stability

采用水热法合成了一种双钒帽多金属氧酸盐[CrⅢ(1,10-phen)2(H2O)]2[PMoⅤ6MoⅥ6O40(VⅣO)2(OH)];利用元素分析、红外光谱、单晶X射线衍射表征了其组成和分子结构,利用热重分析测定了其热稳定性.结果表明,合成的化合物由无序的双帽假Keggin型[PMoⅤ6MoⅥ6O40(VⅣO)2(OH)]6-杂多阴离子和两个[CrⅢ(1,10-phen)2(H2O)]3+配位阳离子单元组成,其热失重分两步进行,热稳定性良好.

A bivanadyl-capped polyoxometalate, [CrIII（1,10-phen）2（H2O）]2[PMo6VMo6VIO40（VIVO）2（OH）], was synthesized by hydrothermal method. The composition and molecular structure of as-synthesized compound were characterized by element analysis, infrared spectrometry, and single-crystal X-ray diffraction; and its thermal stability was evaluated based on thermogravimetric analysis. Results reveal that as-synthesized compound is built by a mixedmetal bicapped [PMo6VMo6VIO40（VIVO）2（OH）]6- subunit and two [CrIII（1,10-phen）2（H2O）]3＋ cations. Besides, as-synthesized product has good thermal stability and experiences two-step thermal decomposition process.