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. 2020 Sep 16;25(18):4246. doi: 10.3390/molecules25184246

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Spiropyran-based molecular switch and the UV-vis absorption spectra in response to different stimuli (Reprinted (adapted) from https://pubs.acs.org/doi/10.1021/jacs.8b09523). (b) Chemical structure of the liquid crystal elastomer containing 2-butyloctyl carbon chains and autonomous arm-like motions of the strip actuator under constant illumination of a laser (Reprinted (adapted) with permission [110]. Copyright (2012) John Wiley and Sons). (c) The photo-isomerization of the chiral olefin and the deformation and color change of the LCE layer when heated from 25 to 200 °C (Reprinted (adapted) with permission [111]. Copyright (2019) John Wiley and Sons) [70]. (d) Photo-reversible dimerization of nitro-cinnamate and typical model to illustrate the light programming (Reprinted (adapted) from Science Advances, Applied Sciences and Engineering [112]. Copyright (2018), American Association for the advancement of Science).