Dawson结构的钨钛磷酸稀土杂多配合物的合成与性质研究

PREPARATION AND PROPERTIES OF RARE EARTH TUNGSTATITANOPHOSPHATE HETEROPOLY COMPLEXES HAVING DAWSON STRUCTURE

合成了5种2:18系列钨钛磷酸稀土杂多配合物,通式为Ln_8[P_2WL_(17)TiO_(62)]_3·XH_2O(Ln=La,Ce,Nd,Sm,Cd)。用红外光谱,紫外光谱,x—射线粉末衍射对它们进行了表征,结果表明这些配合物的杂多阴离子具有Dawson结构,而稀土元素位于杂多阴离子外界。还用热重差热、变温红外及循环伏安对其热性质和氧化还原性质进行了讨论。

Five types of rare earth tungstatitanophosphate heteropoly Complexes with 2:18 series have been synthesized first time in this paper. They have general formula:Ln8[P2W17TiO62]3 · x H2O(Ln = La,Ce,Nd,Sm,Gd).The heteropoly Complexes were characterized by elemential analysis, IR and UV spectrometry and x-ray powder diffraction. The results showed that these Complexes had Dawson structure in which the rare earth elements were in the outphere of heteropoly anion. In addition, their redox properties and thermal stabilities were discussed by thermogravimetric anglysis,differential thermal analysis,IR spectra at different temperatures and cyclic voltammetry.