| Project/Area Number |
17K07880
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Wood science
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| Research Institution | Prefectural University of Hiroshima |
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Principal Investigator |
Aoyagi Mitsuru 県立広島大学, 生命環境学部, 准教授 (10555569)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | リグニン / 光化学 / 光励起 / 光緩和 / エネルギー移動 / 電子移動 / 高分子 / 縮合 / 森林科学 / 励起緩和過程 |
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| Outline of Final Research Achievements |
Native lignin derivatives were directly synthesized from both softwood and hardwood. In order to investigate photo-excitation and relaxation prosesses of located conjugation system in lignin macromolecules, measurements of photochemical behaviors of these lignin materials in THF were carried out using UV-Vis and fluorescence (emission, excitation, synchronized spectra and quenting behaviors). Different energy levels of HOMO-LUMO, energy transfers from singlet states to singlet states, intramolecular transfers,remote transfers of excited energy of conjugations were found. Excited electron transfers from lignin derivatives to TiO2 electrodes were also detected around 470 nm under irradiation of monochromic light. Slight differences of energy levels of located conjugations were controled using diazo groups on aromatic rings in lignin macromolecules.
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| Academic Significance and Societal Importance of the Research Achievements |
材料利用でも不可欠なリグニン高分子の内部構造，その関係性の一部の解明に貢献した。天然リグニン誘導体高分子は一般に濃色であるが，紫外可視分光の結果，400 nm以上の波長領域の吸収が小さく外観との間に差がみられる。リグニンの主鎖はアリールエーテル結合であり，一般に共役系は独立し鎖中に局在している。極端に大きな共役系は形成しにくいことから，相互作用やエネルギー・電子移動による発光の影響であると考えられるが，類似構造であり，高分子鎖中にあるため観測が困難であったが，簡便な方法でその構造のパターンの把握が可能であることが示唆された。
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