期刊
CRYSTAL GROWTH & DESIGN
卷 13, 期 10, 页码 4330-4337出版社
AMER CHEMICAL SOC
DOI: 10.1021/cg400675r
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资金
- Ministry of Education, Culture, Sports, Science and Technology [471]
- Japan Society for the Promotion of Sciences [22350063]
- Grants-in-Aid for Scientific Research [23655129, 22350063] Funding Source: KAKEN
The photomechanical bending behavior of chiral crystals composed of S- and R-enantiomers of photochromic N-3,5-di-tert-butylsalicylidene-1-phenylethylamine in enol form [enol-(S)-1 and enol(R)-1] has been compared With that of achiral crystals of the racemic compound [enol-(rac)-1] of S- and R-enantiomers. Both platelike chiral and achiral crystals, a few millimeters in length, exhibited similar reversible bending upon alternate irradiation with ultraviolet (UV) and visible light. The reversible bending of the achiral enol-(rac)-1 crystal could be repeated over 100 times, while the tip displacement angles of the chiral enol-(S)-1 and enol-(R)-1 crystals gradually decreased with repeated cycles. In situ Xray measurements revealed that the bending motion of the chiral and achiral crystals was caused by a slight shrinkage of the a and b axes of the unit cell, respectively, corresponding to the long axis of the platelike crystals; shrinkage was induced by the shape change of component salicylidenephenylethylamine molecules upon photoinduced proton transfer. The Young's modulus of the enol-(5)-1 crystal was 0.8 GPa, which is smaller than that of the enol-(rac)-1 crystal (2.6 GPa). The crystal cantilevers made of enol-(5)-1 and enol-(rac)-1 lifted metal rings that were up to 50 and 300 times heavier, respectively, than the cantilevers upon UV irradiation. Overall, the achiral enol-(rac)-1 crystal was found to be superior to the chiral enol-(S)-1 crystal as a light driven actuator.
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