Keggin结构钨钼磷混配杂多酸盐的合成和性质研究

Studies on the Synthesis and Properties of M x PW 4Mo 8O 40 · n H 2O With Keggin Structure

用复分解法首次合成了５种Ｋｅｇｇｉｎ结构钨钼磷混配杂多酸盐ＭｘＰＷ４Ｍｏ８Ｏ４０·ｎＨ２Ｏ（Ｍ＝Ｅｔ４Ｎ，Ｂｕ４Ｎ，Ｋ，Ｂａ，Ｚｎ），通过ＩＲ，ＵＶ，ＤＴＴＧＡ，极谱及循环伏安对它们进行了表征．结果表明它们具有Ｋｅｇｇｉｎ结构，热稳定性大小顺序为：Ｋ＋＞Ｂａ２＋＞Ｈ＋＞Ｚｎ２＋＞Ｅｔ４Ｎ＋＞Ｂｕ４Ｎ＋，氧化还原机理为两步单电子的可逆还原过程．

Five new heteropoly complexes of tungstomolybdophosphates M x PW 4Mo 8O 40 · n H 2O (M=Et 4N, Bu 4N, K, Ba, Zn) were prepared by metathesis and were characterized by IR, UV, DTATGA, polarography,and cyclic voltammetry. IR spectra showed that the complexes had Keggin structure. The order of the heatstability was: K +>Ba 2+ >H +>Zn 2+ >Et 4N +>Bu 4N +. The oxidationreduction mechanism was a reversible reduction process in two steps with one electron each.