Recently, Many tri-component heteropoly compounds have been synthesized, but tetra-component heteropoly compounds have not been reported. It is known that mixtures of Mo and Co oxides are a promoted hydrodesulphurization catalyst. The title compound is a polyoxophosphate containing Mo, Co and W, the divalent anion possesses two-fused Keggin structure, whereas MoO6 has been confirmed to be an elementary structure unit of isopoly and heteropoly molybdates, but it, as an idependent anion, has not been reported either.
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