Synthesis, Characterization And Properties Of New Organic-Polyoxometalate Charge-Transfer Compound(CTP)

Organic-polyoxometalate Charge-transfer compound(CTP) is a kind of outstanding molecular-based function material, which show not only a special light, electricity, magnetic properties, but also a vast development application foreground in catalysis, functional materials and the application field of medicine. So the research for synthesis and property of new CTP have become extremely active in the field of materials science, which is not only a new growth point of application study of polyoxometalates chemistry, but also at the forefront of the field of composite materials.In this paper, using different macromoleeular, stable compounds formed from excellent ligand bipyridine (bipy) chelated with transition metal ions as electron donors, phosphotungstic acid, silicotungstic acid with Keggin structure as electron receptors, we synthesised nine new charge transfer polyoxometalate: PEI-HPW, PEI-HSiW, CS-HPW, CDP-HPW, bpy-HPW, bpy-Cu^â…¡-HPW et al. Their structures and properties were characterized by elemental analysis, IR, UV-vis, XPS, 31p NMR and CV et al. The photochromism of nine CTP were discussed; The catalytic performance of oxidative degradation of chitosan with H202 catalyzed by bipy-HPW and photocatalytie degradation of methyl orange in aqueous solution over CDP-HPW were detailed studied.The experimental results show that the interaction between organic donor and heteropolyaeid is strong; All of the nine new CTP were high solvent resistance and better reversible photochromic; The catalytic performance of oxidative degradation of chitosan with H₂O₂ catalyzed by bipy-HPW and photocatalytic degradation of methyl orange in aqueous solution over CDP-HPW both are outstanding, and the catalysts are easy to separate from system and can be repetitive-used.