期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 25, 页码 7073-7076出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201511444
关键词
crystal engineering; crystal growth; energy conversion; materials science
资金
- National Science Foundation [DMR-1508099]
- King Abdullah International Medical Research Center (KAIMRC) [RC10/104]
- Direct For Mathematical & Physical Scien [1508099] Funding Source: National Science Foundation
- Division Of Materials Research [1508099] Funding Source: National Science Foundation
Photomechanical molecular crystals can undergo a variety of light-induced motions, including expansion, bending, twisting, and jumping. The use of more complex crystal shapes may provide ways to turn these motions into useful work. To generate such shapes, pH-driven reprecipitation has been used to grow branched microcrystals of the anthracene derivative 4-fluoroanthracenecarboxylic acid. When these microcrystals are illuminated with light of lambda=405 nm, an intermolecular [4+4] photodimerization reaction drives twisting and bending of the individual branches. These deformations drive a rotation of the overall crystal that can be repeated over multiple exposures to light. The magnitude and direction of this rotation vary because of differences in the crystal shape, but a typical branched crystal undergoes a 508 net rotation after 25 consecutive irradiations for 1 s. The ability of these crystals to undergo ratchet-like rotation is attributed to their chiral shape.
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