Synthesis, characterization and crystal structure of a 1D heteropolytungstate [4,4'-bipyH(2)](2) [4,4'-bipyH][PCoW11O39]center dot H2O

A chain-like structure compound [4,4'-bipyH(2)](2)[4,4'-bipyH][PCoW11O39] center dot H2O, in which lacunary polyoxoanions are joined by a Co-O-W bridge, was prepared through the hydrothermal method and characterized by IR, and X-ray crystallography. The title compound crystallizes in a monoclinic lattice, P2(1)/ n space group, with a = 13.643 ( 3), b = 27.052( 5), c = 15.180( 3) angstrom, beta = 100.63( 3)degrees, V = 5506.2( 19) angstrom(3), Z = 4, R-1 = 0.0792, wR(2) = 0.1532. Cobalt-substituted Keggin-type subunits are connected via Co-O-W bridges to form a 1D, chainlike, polymolecular Keggin POM. TG-DTA analysis indicates the title compound decomposes at 553 degrees C.