2013 Fiscal Year Final Research Report
Construction of Photomechanical Crystals by Utilizing Crystal Engineering
| Project/Area Number |
22350063
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Ehime University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
HASHIZUME Daisuke 独立行政法人理化学研究所, 連携支援チーム, 研究員 (00293126)
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| Project Period (FY) |
2010-04-01 – 2013-03-31
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| Keywords | 結晶光学 / 分子機械 / 分子性固体 / 分子モーター / マイクロマシン |
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| Outline of Final Research Achievements |
Construction of photomechanical crystals was studied by utilizing crystal engineering to find out several crystals such as azobenzene and salicylideneaniline. Platelike microcrystals of salicylideneaniline repeatedly bend and straighten upon alternate irradiation with UV and visible light. The mechanism of bending was elucidated by X-ray crystallographic analyses before and after photoirradiation. The photomechanical bending of chiral crystals composed of S- and R-salicylidenephenylethylamine has been compared with that of the racemic compound. Both platelike chiral and racemic crystals exhibited similar reversible bending upon alternate irradiation with UV and visible light. The Youngs modulus of the chiral crystal is smaller than that of the racemic crystal. The chiral and racemic crystals lifted metal rings that were up to 50 and 300 times heavier, respectively upon UV irradiation. In conclusion, the racemic crystal is superior to the chiral crystal as a photomechanical material.
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| Free Research Field |
化学
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