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AutonomousBehavior_2020Feb_preprint.pdf (2.55 MB)

Autonomous flipping of azobenzene assemblies under light irradiation (II)

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.






Email Address of Submitting Author


Hokkaido University



ORCID For Submitting Author


Declaration of Conflict of Interest

no conflict of interest

Version Notes

Ver.2 (Feb.1, 2020)