OXIDATION OF Tb(Ⅲ)IN THE HETEROPOLY-TUNGSTOPHOSPHATE COMPLEX

摘要

It has first been reported that Tb（Ⅲ）is oxidated by K2S2O8 in the heteropoly-tungstophosphate complex.The complex ion,[Tb（Ⅳ）(PW11O39)2]10-,is stable in aqueous solutiononly for hours,being graduately reduced to[Tb（Ⅲ）(PW11O39)2]11-.It is red-brown,with absorptionband at about 420 nm.