Abstract
Chemical or electrochemical reduction of MoO 3 in neutral aqueous electrolyte solutions results in the reversible topotactic formation of a new type of molybdenum oxide bronzes A + x(H 2O) y[MoO 3] x−. The latter are built up by negatively charged [MoO 3] x− layers with exchangeable hydrated cations in the interlayer space. Non-solvated cations are taken up between the MoO 3 sheets on cathodic reduction of the oxide in organic electrolyte solutions. Galvanostatic studies on the reduction of MoO 3 in aqueous acids reveal the strong influence of kinetics on hydrogen ion uptake. Earlier results of Glemser (2) on “genotypic” hydrogen bronzes of MoO 3 are confirmed. H 0.5MoO 3 was found to exhibit Brönsted acid character and to form a novel type of layer intercalation compounds L xH 0.5MoO 3 with Lewis bases.
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