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Open AccessReview

Photomechanical Azobenzene Crystals

1
Center for Data Science, Waseda University, 27 Waseda-cho, Shinjuku-ku, Tokyo 1620042, Japan
2
Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 1698555, Japan
3
Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 1620041, Japan
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(9), 437; https://doi.org/10.3390/cryst9090437
Received: 12 August 2019 / Revised: 17 August 2019 / Accepted: 20 August 2019 / Published: 22 August 2019
(This article belongs to the Special Issue Recent Progress in Photoresponsive Azopolymers)
Photomechanically responsive materials are promising candidates for future smart actuator applications. The photo-responsive behaviors originate from the photoisomerization of photochromic molecules. A typical photochromic compound, azobenzene, has been studied extensively in the solution state and has played a crucial role in the photomechanical behaviors of materials such as polymers and gels, via chemical bridging with their matrix. In contrast to polymers and gels, the photomechanical attributes of molecular crystals have not progressed to the same degree, due to their rigidity and fragility. However, the past decade has witnessed an increasing number of reports of the photomechanical motion of molecular crystals, including azobenzene crystals. This paper reviews the current state-of-the-art of mechanically responsive azobenzene crystals, including the history, crystal design strategy, and future promising applications. View Full-Text
Keywords: azobenzene; photomechanical motion; trans-cis photoisomerization; molecular crystal; actuation azobenzene; photomechanical motion; trans-cis photoisomerization; molecular crystal; actuation
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MDPI and ACS Style

Taniguchi, T.; Asahi, T.; Koshima, H. Photomechanical Azobenzene Crystals. Crystals 2019, 9, 437.

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