Preparation of hydrated potassium molybdenum bronzes and their thermal decomposition

Three kinds of hydrated potassium bronze, K-0.23(H2O)(0.65) MoO3.00(HyK-AD), K-0.23(H2O)(0.43)MoO3.00(HYK-H2), and K-0.23(H2O)(0.27)MoO3.00(HyK-H1), were obtained from hydrated sodium bronzes by cation exchange, Hydrated potassium bronzes dried under vacuum are of two types, The first, HyK-H2, belongs to the six-coordination type and the second, HyK-H1, belongs to the eight-coordination type, When hydrated bronzes were heated in nitrogen, they turned into a mixture of the blue potassium bronze, K0.3MoO3, and MoO3. In contrast, those heated in air decomposed to K2Mo4O13 and MoO3. (C) 1997 Academic Press.