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Dissipative and Autonomous Square‐Wave Self‐Oscillation of a Macroscopic Hybrid Self‐Assembly under Continuous Light Irradiation
Author(s) -
Ikegami Tomonori,
Kageyama Yoshiyuki,
Obara Kazuma,
Takeda Sadamu
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201600218
Subject(s) - azobenzene , dissipative system , photoisomerization , supramolecular chemistry , oscillation (cell signaling) , self assembly , self organization , chemical physics , nanotechnology , square wave , square (algebra) , materials science , physics , biological system , computer science , molecule , chemistry , quantum mechanics , mathematics , artificial intelligence , biochemistry , isomerization , biology , catalysis , geometry , voltage
Building a bottom‐up supramolecular system to perform continuously autonomous motions will pave the way for the next generation of biomimetic mechanical systems. In biological systems, hierarchical molecular synchronization underlies the generation of spatio‐temporal patterns with dissipative structures. However, it remains difficult to build such self‐organized working objects via artificial techniques. Herein, we show the first example of a square‐wave limit‐cycle self‐oscillatory motion of a noncovalent assembly of oleic acid and an azobenzene derivative. The assembly steadily flips under continuous blue‐light irradiation. Mechanical self‐oscillation is established by successively alternating photoisomerization processes and multi‐stable phase transitions. These results offer a fundamental strategy for creating a supramolecular motor that works progressively under the operation of molecule‐based machines.