2014 Fiscal Year Final Research Report
Development of a molecular function enabling one to take mechanical works from the piston-like molecular motion.
| Project/Area Number |
24550142
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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 |
Functional materials chemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | フォトクロミズム / キラリティー / 液晶 / 分子機械 |
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| Outline of Final Research Achievements |
We aimed the development of a molecular function of a crank-shaft with which we can take the mechanical work out from the photochromic reaction (piston motion). We found out some photoresponsive chiral dopants for liquid crystals showing the change in a large helical twisting power upon photoirradiation. When some of them are doped, the motion of liquid crystal texture showed a hysteresis between forward and backward photoisomerization of the dopant by UV and visible irradiation, respectively. As the result we could attain a molecular crank-shaft function. We also developed some achiral compounds transformable to chiral form by the action of light. If we use a circular polarized light we obtained the chiral molecule with an enantio excess from the achiral compound. On the mechanism of the crank-shaft effect we explained the phenomenon with the contribution of a more disordered molecular alignment of the dopant upon backward photoisomerization.
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| Free Research Field |
複合化学
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