| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2012: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
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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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