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AutonomousBehavior_2020Feb_preprint.pdf (2.55 MB)
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Autonomous flipping of azobenzene assemblies under light irradiation (II)

preprint
submitted on 01.02.2020 and posted on 03.02.2020 by Yoshiyuki Kageyama, Tomonori Ikegami, Shinnosuke Satonaga, Kazuma Obara, Hiroyasu Sato, Sadamu Takeda

To create autonomous microrobots which move in the presence of a constant energy source, their mechanical motion must have a capacity for self-control. This is realized when a structural change occurs with conversion of energy facilitated by cofactors, with a self-regulation component to prevent reaching a static state. Here, we present a single crystal structure analysis of azobenene derivatives which reveals a mille-feuille-like layered structure of sparse and dense layers of six independent azobenzene moieties. In this anisotropic structure, a specific azobenzene molecule acts as a reaction center for a light-to-mechanical function process. The other molecules in the crystal act as modulators. Moreover, depending on the photoisomerisation process activated by a polarized light source, different cyclic motions are observed. We clarify the mechanism by which the self-organized mechanical behavior of these azobenzene molecules is achieved at the molecular level. Thus, the present results demonstrate that autonomously driven molecular materials can exhibit information-responsive and self-sustainable motion by incorporating stimulus-responsive sensors.

Funding

JPMJPR13K6

JP17H05247

JP18H05423

History

Email Address of Submitting Author

y.kageyama@sci.hokudai.ac.jp

Institution

Hokkaido University

Country

Japan

ORCID For Submitting Author

0000-0002-2287-832X

Declaration of Conflict of Interest

no conflict of interest

Version Notes

Ver.2 (Feb.1, 2020)

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