Directional synthesis of α-AgFe(MoO4)2 from {Mo72Fe30}-type Keplerate

Abstract

When an aqueous solution of the {Mo₇₂Fe₃₀} cluster containing compound [Mo₇₂Fe₃₀O₂₅₂(CH₃COO)₁₂{Mo₂O₇(H₂O)}₂{H₂Mo₂O₈(H₂O)}(H₂O)₉₁]·150 H₂O (1) was refluxed with AgNO₃, a yellow colored amorphous precipitate was obtained. This amorphous substance, on calcining at high temperature, transformed into dark-yellow crystalline substance of α-AgFe(MoO₄)₂. We have proposed a new concept of unfolding the giant discrete polyoxometalate cluster leading to the isolation of a mixed metal oxide having an extended structure.