SynthesisandCrystalStructureofaNewDinuclearCopper（II）Polymer:[Cu2（bipy）2（Hbtc）2（H2O）2]·（H2O）1/2

A new dinuclear copper(II) polymer [Cu2(bipy)2(Hbtc)2(H2O)2]·(H2O)1/2 1 (bipy = 2,2·-bipyridine, H3btc = benzene-1,3,5-tricarboxylic acid) was obtained by the hydrothermal reaction of Cu(NO3)2·3H2O, bipy and H3btc. Compound 1 has been structurally characterized by single-crystal X-ray diffraction analysis and identified using elemental analysis and IR spectrum. The title complex crystallizes in monoclinic system, space group P21/c with a = 7.2880(5), b = 18.4778(13), c = 13.5465(10)A, β = 95.9580(10)o, C19H14.50CuN2O7.25, Mr = 450.37, V = 1814.4(2) ·3, Z = 4, Dc = 1.649 g/cm3, μ = 1.253 mm-1, F(000) = 918, Rint = 0.0185, the final R = 0.0271 and wR = 0.0710 for 2773 observed reflections (I > 2σ(I)). The study results reveal that a pair of distorted square-pyramidal Cu2+ ions are interlinked by bis-monodentate bridging Hbtc2- ligands to constitute a 16-membered ring.