Metal-substituted tungstosulfates with Keggin structure: synthesis and characterization

Abstract

Simple synthetic procedures for accessing novel metal-substituted tungstosulfates [SMW₁₁O₃₉]⁴⁻ with Keggin-type structures were developed based on the reaction of metal ions (M = Mn²⁺, Co²⁺, Ni²⁺, and Cu²⁺) with lacunary tungstosulfate, [SW₁₁O₃₉]⁶⁻, which was obtained by treating [SW₁₂O₄₀]²⁻ with a weak base in acetone. All metal-substituted tungstosulfates were characterized by elemental analysis, X-ray crystallography, ESI-MS, IR, Raman, UV-Vis and cyclic voltammetry analyses.