Two new compounds constructed from polyoxoanions, metal ions and organic ligands

Two new compounds, namely [Cu4(4,4′-bpy)4][SiW12O40]·6H2O (1) and [Cu2(4,4′-bpy)2][SiMo12O40]·(H24,4′-bpy) (2) (bpy = bipyridine), have been hydrothermally synthesized and characterized by IR, UV–Vis, X-ray photoelectron spectroscopy (XPS), powder XRD, elemental analyses and single crystal X-ray diffraction. The two compounds represent new examples of compounds constructed from Keggin polyanions, metal ions and organic ligands. Compounds 1 and 2 both contains Cu(4,4′-bpy)nn+ infinite chains and [SiM12O40]4− anions (M = W for 1 and M = Mo for 2). However, the structures of compounds 1 and 2 are thoroughly different. The Cu(4,4′-bpy)nn+ infinite chains and [SiW12O40]4− anions in compound 1 are connected into a 2-D layered framework structure, and the Cu(4,4′-bpy)nn+ infinite chains and [SiMo12O40]4− anions in compound 2 are linked into a 1-D ladder-like structure.