A Keggin-type polyoxotungstate-coordinated diplatinum(II) complex: Synthesis, characterization, and stability of the cis-platinum(II) moieties in dimethylsulfoxide and water

The synthesis of a Keggin-type polyoxotungstate-coordinated diplatinum(II) complex, [(CH3)4N]3[α-PW11O39{cis-Pt(NH3)2}2], obtained by reaction of Keggin-type mono-lacunary polyoxotungstate, [α-PW11O39]7−, with cis-diamminedichloroplatinum(II) in an aqueous solution is described. The complex was characterized by elemental analysis, thermogravimetric/differential thermal analysis (TG/DTA), Fourier transform infrared (FTIR), ultraviolet-visible (UV–vis), and solution 1H, 31P, and 183W nuclear magnetic resonance (NMR) spectroscopy. The two cis-platinum(II) moieties, [cis-Pt(NH3)2]2+, were coordinated each to two oxygen atoms in a mono-vacant site of [α-PW11O39]7− with Cs symmetry, and the cis-conformation was highly stable in dimethylsulfoxide and water.