Metal-substituted tungstosulfates with Keggin structure: synthesis and characterization

Simple synthetic procedures for accessing novel metal-substituted tungstosulfates [SMW 11 O 39 ] 4− with Keggin-type structures were developed based on the reaction of metal ions (M = Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ ) with lacunary tungstosulfate, [SW 11 O 39 ] 6− , which was obtained by treating [SW 12 O 40 ] 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. Simple synthetic procedures for accessing novel metal-substituted tungstosulfates [SMW 11 O 39 ] 4− (M = Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ ) with Keggin-type structures were developed.