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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, 06:31 and posted on 03.02.2020, 11:49 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)