K_(10)H_5[Ln(PMo_7W_2V_2O_(39))_2]五元杂多配合物的合成与表征

Synthesis and properties of pentabasic heteropoly complexes K_(10)H_5[Ln(PMo_7W_2V_2O_(39))_2]

合成了通式为K10 H5 [Ln(PMo7W2 V2 O39) 2 ]·nH2 O (Ln =La3+,Ce3+,Pr3+,Nd3+,Sm3+,Eu3+,Gd3+,Dy3+,Yb3+)的 9种五元新型杂多配合物 .并用元素化学分析 ,TG ,ICP ,IR ,UV ,31P ,5 1V -NMR ,ESR ,XPS ,XRD进行了表征 .结果表明新配合物仍保持Keggin结构 ,稀土元素处于配合物的内界 .借助TG -DTA ,不同温度下的IR ,XRD和水溶性实验考察了新配合物的热解性质 ,得出了热稳定的温度范围为 4 0 0℃～ 50 0℃ 。

The synthesis of nine new type heteropoly complexes of general molecular formula K 10 H 5[Ln(PMo 7W 2V 2O 39 ) 2]· n H 2O(Ln=La 3+ ,Ce 3+ ,Pr 3+ ,Nd 3+ ,Sm 3+ ,Eu 3+ ,Gd 3+ ,Dy 3+ ,Yb 3+ ) are reported. The results of CP,IR,UV, 31 P, 51 VNMR,ESR,XPS and XRD spectra demonstrate that the products still maintain Keggin structure, and the rare earth elemont is in the inner sphere of the complexes. Their thermal stabilities studied by water solubility test, elemental analysis, TG-DTA,IR and XRD at various temperature indicate that the range of pyrolysis temperature is 400 ℃～450 ℃. These are very helpful for the catalytic research.