2013 Fiscal Year Final Research Report
Dynamics and mechanism of delocalized cationic state in organic photoconductive polymers
| Project/Area Number |
23245004
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2011-11-18 – 2014-03-31
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| Keywords | 光誘起電子移動 / ホール移動 / 有機光伝導体 / フェムト秒分光 / 過渡二色性 / 電荷シフト反応 |
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| Research Abstract |
To elucidate factors enabling the rapid charge shift reaction in the charge-separated state produced by photoinduced charge separation in molecular assemblies, we have studied the electron transfer dynamics in aromatic vinyl polymer systems in solid phase where rapid charge shift reaction takes place among aromatic groups after the photoexcitation. By femtosecond transient absorption spectroscopy and dichroism measurements in the temperature range of 10 to 295 K, it was revealed that the delocalization process of the cationic state occurred among several aromatic groups very rapidly. This delocalization leads to the increase in the inter-ionic distance between the anion and the cation resulting in the reduction of the attractive Coulombic interaction and the increase in the cationic size reduces the reorganization energy. These factors facilitate the rapid charge shift reaction which has not been well accounted for by the conventional electron transfer theories.
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[Journal Article] Constraint-induced structural deformation of planarized triphenylboranes in the excited state2014
Author(s)
T. Kushida, C. Camacho, A. Shuto, S. Irle, M. Muramatsu, T. Katayama, S. Ito, Y. Nagasawa, H. Miyasaka, E. Sakuda, N. Kitamura, Z. Zhou, A. Wakamiya, S. Yamaguchi
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Journal Title
Chem. Sci
Volume: 5
Pages: 1296-1304
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