碱土金属钨铬杂多配合物的合成、表征及热稳定性研究

Synthesis and characterization study on thermal stability of alkaline-earth metals with tungsten-chromium heteropoly acid

用直接法合成了以Cr为中心原子的碱土金属和W的三元杂多配合物,经ICP和TG曲线确定其化学式为K7[CrA(H2O)W11O39].xH2O(A=Mg2+,Ca2+,Sr2+和Ba2+),采用IR,UV,XRD,XPS和183W NMR等手段对配合物结构进行了表征,确认所合成的配合物为-αKeggin结构.借助TG-DTA详细讨论了配合物的热稳定性,得出合成配合物的热稳定温度为450℃左右.

The alkaline-earth metals tribasic heteropoly compounds with Cr as the central atom had been synthesized directly and characterized by IR,UV,XRD,XPS and ^183W NMR. By means of ICP and TG,the molecular formulas were confirmed as K7[CrA（H2O）W11O39]· xH2O（A=Mg^2＋, Ca^2＋, Sr^2＋, Ba^2＋）. It is confirmed that the complex is Keggin structure. Furthermore, their thermal stabilities were discussed by dint of TG-DTA, it shows that thermolysis temperature range of the obtained complexes is around 450℃.