Solvothermal synthesis, structure and properties of two new compounds based on Keggin polyoxometalates decorated by copper complexes

Abstract

Two new organic-inorganic hybrid compounds based on polyoxometalate building blocks, [CuI(bpy)2]2{[CuII(bpy)]2 O40} (1), H[Cu(bpy)(H2O)]{[Cu(bpy)]4(PO4)2}{PW11 CuO39} · H2O (2) (bpy = 2,2′-bipyridine), have been solvothermally synthesized and characterized by elemental analyses, IR, and TG analysis. Single crystal X-ray diffraction reveals that 1 is built from the reduced α-Keggin polyoxoanion [O40]6− bicapped by two [CuII(bpy)]2+ through four bridging oxo groups on two opposite [Mo4O4] faces. 1 shows mild photoluminescence in the solid state at room temperature. 2 is based on monovacant Keggin anion {PW11CuO39}5− linked through Cu(bpy)2+ and, generating a one-dimensional chain. Magnetism indicates predominantly antiferromagnetic interaction in 2.