3D visualization of geometries of photoinduced charge-separated states by development of electron spin polarization imaging method
| Project/Area Number |
17K19105
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry, Functional solid state chemistry, and related fields
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| Research Institution | Kobe University |
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Principal Investigator |
Kobori Yasuhiro 神戸大学, 分子フォトサイエンス研究センター, 教授 (00282038)
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| Project Period (FY) |
2017-06-30 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Keywords | 光合成 / 光電荷分離 / 電子的相互作用 / 構造解析 / 太陽光エネルギー変換 / 電子スピン共鳴 / タンパク質 / 異方性 / 植物光合成 / 光電荷分離状態 / 立体構造 / 電子スピン共鳴法 / 光エネルギー変換 / 可視化 / 電荷分離 / 電子スピン分極 |
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| Outline of Final Research Achievements |
We have developed a novel method of “3D spin polarization imaging” by which the anisotropic spin polarization is mapped to all possible magnetic field directions from the powder-pattern time-resolved electron paramagnetic resonance (EPR) spectra to obtain geometries of the photoinduced primary charge-separated (CS) state of quinone pre-reduced membranes of plant PSII from spinach in frozen solution and in oriented multilayers at 77 K. For this we have observed the primary CS states using an X-band time-resolved EPR method. From the imaging maps, we have characterized cofactor geometries and electronic coupling of the photoinduced primary CS state. It has been revealed that that the electronic coupling between the charges is significantly weak in the CS state separated by 1.5 nm, showing an importance of regulated cofactor-cofactor electronic interaction between a vinyl substituent and an accessory chlorophyll to inhibit the energy-wasting charge-recombination.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、初期電荷分離活性種の同定を行うだけでなく、中間体分子の立体的な位置、距離、分子配向および軌道の広がりや重なりによる電子的相互作用を量子論に立脚した全く新しい磁気イメージング法の開発により正確に求めた。これは、試料の結晶化が不可能な複雑系であっても中間体やラジカル対の立体構造をオングストローム領域の高い空間分解能にて三次元映像化する画期的なツールを提供するものであり、磁気共鳴原理をベースとした本技術の開発は太陽電池における効率的電荷生成や新しい光触媒開発への応用や、特定分子をターゲットとする治療への応用など、産業・医療分野の広範囲な応用への可能性を十分に秘めている。
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Report
(4 results)
Research Products
(55 results)
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[Journal Article] Identifying triplet pathways in dilute pentacene films2018
Author(s)
Lubert-Perquel Daphn?、Salvadori Enrico、Dyson Matthew、Stavrinou Paul N.、Montis Riccardo、Nagashima Hiroki、Kobori Yasuhiro、Heutz Sandrine、Kay Christopher W. M.
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Journal Title
Nature Communications
Volume: 9
Issue: 1
Pages: 4222-4222
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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