2018 Fiscal Year Final Research Report
Advanced Control of Photochemical Reactions by Multiple-Photon Processes
| Project Area | Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions |
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| Project/Area Number |
26107002
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
長澤 裕 立命館大学, 生命科学部, 教授 (50294161)
八ツ橋 知幸 大阪市立大学, 大学院理学研究科, 教授 (70305613)
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| Research Collaborator |
ITO Syoji
SOTOME Hikaru
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| Project Period (FY) |
2014-07-10 – 2019-03-31
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| Keywords | 光化学 / 多重励起プロセス / 多光子過程 / 光機能 / 超高速分光 / フォトクロミズム |
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| Outline of Final Research Achievements |
Because of the rapid relaxation from higher electronic excited state to the lowest one, the reaction strongly dependent on the electronic state was hardly known for the polyatomic molecules. From studies of photochromic molecules in condensed phase, however, we found efficient ring-opening reactions in highly excited states attained by the stepwise two-photon absorption and responses dependent on the excitation mode. On the basis of these studies, we aimed the elucidation of these reactions, realization of more effective reactions in highly excite state, and the exploration of the new reactions in highly excited state in the present project. By developing the precise detection system with the multiple excitation of femtosecond laser pulses, we revealed the electronic state and nuclear configuration for the ring-opening reaction from the high-order electron state of the 6π electron system and the mechanism of the electron transfer and election from the high-order electron state.
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| Free Research Field |
物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
多原子分子では高位電子励起状態から最低励起状態への迅速な緩和のため、励起に用いられた光ネルギーの損失が起こるとともに、電子状態に強く依存した反応を進行させることも困難であった。これらの高位電子励起状態分子の共通の特徴は、効率的な光エネルギー利用における大きさ制限になっていた。本課題では凝縮系において大きな多原子分子である６π電子系の高位電子状態からの特異的高効率開環反応や芳香族分子系の電子放出を主な対象に詳細な研究を行い、反応に関わる高位電子状態や核配置の観点から機構を解明した。これらの結果は分子系を用いた光の有効利用に対する共通制限の超克に対し、重要な知見を与えたものとして位置づけられる。
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