Synthesis and Electrochemical Properties of ((CH3)2NH2)7[P2W17NbO62]

详细

The bis(oxalate) complex of niobium (NH₄)[NbO(C₂O₄)₂(H₂O)₂]·3H₂O can be used as a source of niobium to incorporate the {NbO}³⁺ group into a cavity of the monolacunary Dawson-type [α₂-P₂W₁₇O₆₁]¹⁰⁻ anion. The product is isolated from the reaction mixture as dimethylammonium salt (Me₂NH₂)₇[α₂-P₂W₁₇NbO₆₂]·3H₂O (1) and characterized by single crystal XRD, IR and Raman spectroscopy, and elemental analysis. (NBu₄)₆(Me₂NH₂)[α₂-P₂W₁₇NbO₆₂] (2) is obtained by adding Bu₄NBr to an aqueous solution of 1. The comparison of the electrochemical properties of complex 2 and (NBu₄)₆[P₂W₁₈O₆₂] shows that the incorporation of niobium atom hinders the anion reduction.