钼钨铌磷杂多化合物的研究(Ⅰ)——杂多酸的合成和表征

Studies on Molybdotungstoniobophosphoric Heteropoly Compounds (Ⅰ)--Syntheses and Characterization of the Heteropoly Acids

提出了分步酸化一分步加料合成[PNb_2Mo_xW_(10-x)O_(40)]^(5-)(x=0,2,4,6)系列杂多酸的方法,给出了最佳配料比和生成反应的pH值,并进行了红外、紫外、极谱、电位滴定及热稳定性研究。

The method of syntheses and properties of a system of heteropoly acids of [PNb2MoxW1-x O40]5-(x=0,2,4,6) are reported, in which the acidification and the addition of materials are carried out stepwise. The optimal rate of the materials and the pH of the reaction are given. The determination of IR and UV spectra shows that the acids have Keggin structure. The polarographic data confirm their reduced patterns. The potential titration in organic solvent gives their alkaline of 5. The experiments of thermal stability indicate that the crystal water is essential to stabilizing of these acids.