杂多酸(Heteropoly acid)及其盐类是一种特殊类型的配合物。元素周期表中的V_B组和VI_B 组的V、Nb、Ta、Mo、W 的含氧酸,都有可能与P、Si、B、Ge 等含氧酸缩合形成杂多酸阴离子,其中Mo 和W 最容易形成杂多酸(盐),对它们的研究也较全面。六十年代起,由于杂多酸(盐)在催化、生化、抗癌药物 Heteropolyacids and their salts are a special type of complex. The V, Nb, Ta, Mo, W oxoacids of groups V_B and VI_B in the Periodic Table are likely to condense with oxoacids such as P, Si, B and Ge to form heteropolyacid anions, where Mo and W most likely to form heteropoly acid (salt), their research is more comprehensive. Since the sixties, due to heteropoly acid (salt) in the catalytic, biochemical, anti-cancer drugs