Synthesis, characterization and crystal structure of a 1D heteropolytungstate [4,4′-bipyH2]2[4,4′-bipyH][PCoW11O39]·H2O

A chain-like structure compound [4,4′-bipyH2]2[4,4′-bipyH][PCoW11O39] · 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, P21/n space group, with a = 13.643 (3), b = 27.052(5), c = 15.180(3) Å, β = 100.63(3)°, V = 5506.2(19) Å3, 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°C.