Abstract
It is a dream for chemists to construct molecular systems, which can transform shape changes of individual molecules induced by chemical or physical stimuli to macroscopic motion of materials and perform mechanical work. During the course of a study of single-crystalline photochromism of diarylethenes, we found that the surface morphology of the single crystals, as well as the bulk crystal shape, reversibly changes upon photoisomerization of component diarylethene molecules. Single crystals of 1,2-bis(2-ethyl-5-phenyl-3-thienyl)perfluorocyclopentene (3a) and 1,2-bis(5-ethyl-2-phenyl-4-thiazolyl)perfluorocyclopentene (4a) with sizes ranging from 10 to 100 μm change their shape from a square to a lozenge, whereas a rectangular single crystal of 1,2-bis(5-methyl-2-phenyl-4-thiazolyl)perfluorocyclopentene (5a) contracts in length. X-ray crystallographic analysis revealed that the geometrical structure changes of individual molecules in densely packed crystals induce the crystal shape deformation. A rod-like crystal prepared from 5a reversibly bends upon alternate irradiation with ultraviolet (UV) and visible light due to the gradient in the extent of the photoisomerization in the crystal. The fatigue resistance of the crystals is remarkably improved by mixing two diarylethene derivatives. Upon UV irradiation the mixed crystal can repeat the light-driven bending cycle more than 1,000 times and lift a metal load, which is several hundred times heavier than that of the crystal. A two-component mm-size cocrystal composed of 1,2-bis(2-methyl-5-(1-naphthyl)-3-thienyl)perfluorocyclopentene (8a) and perfluoronaphthalene (FN) also performs fatigue-resistant mechanical work. The robust light-driven actuators made of diarylethene molecules having substantial mechanical properties can be potentially applied in various micro- and nano-mechanical devices.
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Irie, M. (2013). Photomechanical Response of Diarylethene Single Crystals. In: Irie, M., Yokoyama, Y., Seki, T. (eds) New Frontiers in Photochromism. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54291-9_1
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DOI: https://doi.org/10.1007/978-4-431-54291-9_1
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