1989 Fiscal Year Final Research Report Summary
Design and Synthesis of Molecules which act as a catalyst for the Conversion of Solar Energy
| Project/Area Number |
63470016
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
有機化学一般
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| Research Institution | Osaka University |
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Principal Investigator |
SAKATA Yoshiteru Osaka University, The Institute of Scientific and Industrial Research, Associate Professor, 産業化学研究所, 助教授 (60029874)
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| Co-Investigator(Kenkyū-buntansha) |
MISUMI Soichi Osaka University, The Institute of Scientific and Industrial Research, Professor, 産業化学研究所, 教授 (40029830)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Photoinduced Electron Transfer / Primary Process of Photosynthesis / Conversion of Solar Energy / Relative Orientation of Chromophores / Model Compounds for Photosynthesis / Charge Separation / Electron Transfer Rate / Porphyrin |
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| Research Abstract |
Photosynthesis, in which Nature converts the solar energy into useful energy, has been an ultimate goal for organic chemists. The critical event in the early stage of photosynthesis is the stable charge separation which is achieved by the several kinds of chromophores embedded in the protein matrix. The efficient forward- and inefficient back-electron transfers, responsible for the stable charge separation, are highly dependent upon the structural factors of the chromophores. One of the best strategy to understand these factors and to get information for the construction of artificial photosynthetic catalysts is to synthesize suitable model compounds. We have carried out our study along this line and got the following results. 1. We fixed our model compound with multistep electron transfer process into lipid bilayer and observed the photocurrent across the layer during irradiation. This indicates that the molecule really act as a catalyst for solar energy conversion. 2. We have prepared a (porphyrin)-(CH_2)_3-(quinone) compound with a long alkyl chain and fixed it into bovine serum alubumin. Unfortunately, we could not determine the effect of protein upon electron transfer since the porphyrin chromophore in protein did not show fluorescence. 3. We have synthesized model compounds, in which only the orientation of a porphyrin and a quinone is different and concluded that photoinduced electron transfer is fairly dependent upon the orientation of chromophores.
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[Publications] Y. Sakata, S. Nakashima, Y. Goto, H. Tatemitsu, S. Misumi, T. Asahi, M. Hagihara, S. Nishikawa, T. Okada, and N. Mataga: "Synthesis of Completely Fixed Porphyrin-Quinone Compounds and the Mutual Orientation Effect on Electron Transfer" J. Am. Chem. Soc., 111, 8979-8981 1989.
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