Hydrothermal synthesis,crystal structure and thermal property of(4,4′-bipyH)_3[PW_12O_(40)](4,4′-bipy)·7H_2O

The supramolecular compound,(4,4′-bipyH)_3[PW_12O_40](4,4′-bipy)·7H_2O,has been synthesized by hydrothermal method and characterized by elemental analysis,IR,UV-vis,TG-DTA and single crystal X ray diffraction structural analysis.The crystal belongs to monoclinic system with a space group P2(1)/c.The title compound is composed of [PW_12O_40]~3-heteropolyanion,four 4,4′-bipy molecules and seven lattice water molecules.The heteropolyanion,protonated 4,4′-bipy and lattice water molecules are connected to a supramolecular compound by hydrogen bonds.The heteropolyanions are connected to an infinte layered structure with the protonated 4,4′-bipy.