1987 Fiscal Year Final Research Report Summary
Preparation of polymers having photo-induced eletron transmitting capabilities and their application for photocatalysis
| Project/Area Number |
61550669
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Chiba University |
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Principal Investigator |
NAKAHIRA Takayuki Faculty of Engineering, Chiba University Associate Professor, 工学部, 助教授 (30009740)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Ruthenium Trisbibyridyl Complex / Viologen / Diquat / Photo-induced Electron / Transmitting Polymers / Polymeric Sensitizers |
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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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