New organic–inorganic hybrid compounds constructed from polyoxometalates and transition metal mixed-organic-ligand complexes.

Five new organic–inorganic hybrid compounds based on different polyoxoanions [H_xGeW₁₂O₄₀]ⁿ⁻ or [H₃As₂W₁₈O₆₂]³⁻ (x = 0, 2; n = 4, 2), namely [Cu₃(2,2′-bpy)₃(inic)(OH)(H₂O)][GeW₁₂O₄₀]·1.5H₂O (1), [Cu₂(phen)₂(μ₂-Cl)₂(inic)]₂[H₂GeW₁₂O₄₀]·2H₂O (2), [Cu₂(phen)₂(μ₂-Cl)Cl(nic)]₂[H₂GeW₁₂O₄₀] (3), [Cu₂(2,2′-bpy)₂(hnic)Cl]₂[H₂GeW₁₂O₄₀] (4), [Cu(phen)(inic)H₂O][Cu₂(phen)₂(inic)₂(H₂O)][H₃As₂W₁₈O₆₂]·3H₂O (5) (inic = isonicotinic acid, nic = nicotinic acid, hnic = 2-hydroxy-nicotinic acid, 2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline), have been synthesized and characterized by IR, UV-Vis, XRD, cyclic voltammetric measurements and single crystal X-ray diffraction analysis. Single crystal X-ray analysis reveals that compound 1 is isomorphous and isostructural with a compound reported by us recently, the main difference between the two is the heteroatom of the polyoxoanions in the two compounds. Compound 2 is a supramolecular structure constructed from polyoxoanions and transition metal mixed-organic-ligand complexes. Compound 3 is a novel polyoxoanion bi-supported transition metal mixed-organic-ligand complex. Compound 4 is a 1-D chain structure constructed from polyoxoanions and transition metal mixed-organic-ligand complexes. The photodegradation properties of compounds 1–5 have been analyzed. [ABSTRACT FROM AUTHOR]