Palladium(II)-Containing Tungstoarsenate(V), [Pd(AsWO)], and Its Catalytic Properties.

We have synthesized and structurally characterized the 4-palladium(II)-containing 30-tungsto-4-arsenate(V), [Pd(AsWO)] (), which represents the first palladium(II)-containing tungstoarsenate(V). The title polyanion was prepared by a simple one-pot procedure in aqueous medium and characterized by single-crystal X-ray diffraction (XRD), thermogravimetric analysis (TGA), cyclic voltammetry, elemental analysis, and W nuclear magnetic resonance (NMR), infrared (IR), and ultraviolet-visible (UV-vis) spectroscopies. Polyanion consists of four Pd ions that are coordinated in a square-planar geometry to two trilacunary [AsWO] Wells-Dawson fragments resulting in a sandwich-type assembly. Catalytic studies on revealed that it is an efficient catalyst precursor for the Suzuki-Miyaura cross-coupling reactions of various aryl halides in aqueous and nonaqueous media.