Synthesis and crystal structure of a new coordination polymer constructed from Dawson-type polyoxotungstate and transition metal complexes [Cu(H2Biim)2]2H2P2W18O62 · 2C2H5OH · 2H2O

Abstract

A new coordination polymer constructed from Dawson-type polyoxotungstate and transition metal complexes [Cu(H2Biim)2]2H2P2W18O2 · 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-P2W18O62]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) A3, T = 296(2) K, Z = 4, μ = 22.774 mm−1, GOOF = 1.017, R1 = 0.0590 and wR2 = 0.1394.