Extended structure constructed from sandwich-type tungstoantimonites fused together by water substitution on the sandwiching metal centers

A polyoxotungstate, {Na₆(H₂O)₁₆}{Mn₃(H₂O)_6?W(OH)₂}{SbW₉O₃₃}₂]?·?13H₂O (1), has been synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. Compound 1 exhibits a 1-D chain-like structure composed of the sandwich-type tungstoantimonites fused together by water substitution on the sandwiching metal centers, rarely observed in POM chemistry. Electrocatalytic studies show that 1 has electrocatalytic activity for the reduction of nitrite.