Construction And Properties Of Organic-inorganic Hybrid Materials Based On Keggin Type Polyanions

Within the field of supramolecular inorganic chemistry, self-assembly process of functional systems has received considerable attention. The application of metal-ligand interactions has generated a variety of coordination complexes with special functional properties such as electric, magnetic, catalytic and optical properties.Polyoxometalates (POMs) are regarded as one of the best building blocks for the fabrication of functional hybrid materials. Based on molecular design and assembly, much interest at present is focused on construction of polyoxometalate-based complexes via self-assembly of predesigned ligands with appropriate metal ions.(1) Two organic-inorganic hybrid compounds, [FeC₁₄H₂₀N]₄[SiMo₁₂O₄₀] (1) and [FeC₁₄H₂₀N]₃[PMo₁₂O₄₀] (2), have been synthesized and structurally characterized by single-crystal X-ray diffraction analysis, IR spectroscopy, thermal gravimetric (TG) technique based on Keggin polyoxometalates units.(2) We have synthesized two coordination complexes,[Ag₄L¹₂]·[SiMo₁₂O₄₀]·4CH₃CN (3) and [Ag₃L¹₄][PW₁₂O₄₀]·1.5CH₃OH (4), from the ligand L¹ (N,N'-bis(furan-2-ylmethylene)hydrazine) with AgNO₃ and polyoxoanions of Keggin type. These compounds are characterized by single-crystal X-ray diffraction analysis. IR spectroscopy, UV spectroscopy and thermal gravimetric (TG) technique.(3) Two compounds [C₁₂H₁₆N₄]₂ [SiMo₁₂O₄₀]·CH₃OH·CH₃CN (5) and C₁₂H₁₄N₄ (6) were synthesized and characterized by single-crystal X-ray diffraction analysis from H₄SiMo₁₂, Cu(NO₃)₂ and Schiff base ligand L²,...