A shuttling molecular machine with reversible brake function |
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Authors: | Hirose Keiji Shiba Yoshinobu Ishibashi Kazuaki Doi Yasuko Tobe Yoshito |
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Institution: | Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, Japan. hirose@chem.es.osaka-u.ac.jp |
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Abstract: | Design, synthesis, and demonstration of a prototype of a shuttling molecular machine with a reversible brake function are reported. It is a photochemically and thermally reactive rotaxane composed of a dianthrylethane-based macrocycle as the ring component and a dumbbell shaped molecular unit with two, secondary ammonium stations separated by a phenylene spacer as the axle component. The rate of shuttling motion was shown to be reduced to less than 1 % (from 340 to <2.5 s(-1)) by reducing the size of the ring component from 30-crown-8 to 24-crown-8 macrocycles upon photoirradiation. The ring component was turned back to 30-crown-8 by thermal ring opening, thus establishing a reversible brake function that works in response to photochemical and thermal stimuli. |
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Keywords: | crown compounds molecular devices noncovalent interactions photochromism rotaxanes |
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