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=Mg^2+,Ca^2+,Sr^2+和Ba^2+),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α-Keggin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℃.