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An organic-inorganic compound [Cu(2,2′-bpy)2][{Cu(2,2′-bpy)2}2W12O40(H2)]·4H2O (Mr = 4048.00) was prepared from the hydrothermal reaction of Na2WO4·2H2O, CuCl2·2H2O, 2,2′-bipyridine (2,2′-bpy) and H2O at 160 ℃ for 4 days. The compound cryst