Synthesis and Crystal Structure of a New Coordination Polymer Constructed from Dawson-Type Polyoxotungstate and Transition Metal Complexes [Cu(H2Biim)2]2H2P2W_(18)O_(62)·2C2H5OH·2H2O~1

摘要

A new coordination polymer constructed from Dawson-type polyoxotungstate and transition metal complexes [Cu(H2Biim)2]2H2P2W_(18)O_(62)·2C2H5OH·2H2O (H2Biim = 2,2'-diimidazole) (I) have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectrum, and TG analysis. The crystal structure of I contains a Dawson-type [α-P2W_(18)O_(62)]~(6-) polyanion, two metal coordination cations [Cu(H2Biim)2]~(2+), two protons, two ethanol molecules, and two lattice water molecules. Interestingly, a three-dimensional supramolecular framework is formed via N-H…O hydrogen bonds. Complex I crystallizes in the monoclinic system, space group C2/c with a = 22.742(3), b = 14.780(2), c = 29.637(5) A, β = 111.199(2)°, V= 9288(2) A~3, T= 296(2) K, Z= 4, μ= 22.774 mm~(-1), GOOF = 1.017, R1 = 0.0590 and wR2 = 0.1394.