| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
Homopolymers and copolymers of 4-methyl-4'-vinyl-2,2'-bipyridine(Vbpy), vinylferrocene, vinylpyridine, styrene, and maleic anhydride were prepared. Subsequent complexation and reactions with various reagents afforded a variety of photoredox polymers having ruthenium trisbipyridyl(Ru(bpy)_3^<2+>), paraquat (viologen,V^<2+>), diquat(DQ^<2+>), and ferrocene. A method of introducing both Ru(bpy)_3^<2+> and DQ^<2+> groups to polymers using Vbpy residues was established. Quenching of Ru(bpy)_3^<2+> emission by electron acceptor/relays V^<2+> and DQ^<2+> as well as formation of radical cations V^+ and Dq^+ in the presence of a sacrificial agent, revealed that concentration and adsorption of electron acceptor/relays in the polymer domain or on the polymer membrane surface are important for efficient electron transfer and charge accumulaton. A similar investigation with a two-layered membrane composed of relay and Ru(bpy)_3^<2+> layer. The polymers were coated onto the platinized titanium oxide photocatalyst to examine spectral sensitization leading to hydrogen production by visible light irradiation. Adjustment of the polymer hydrophilicity as well as proper arrangement of redox groups leading to a potential gradient in the polymer was suggested to be important in developing high-efficiency spectrally-sensitized photocatalysts and photodevices.
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