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Visible Light-Induced Collapse of Molecular Microcrystals into Droplets by E-to-Z Photoisomerization and Melting Phase Transition 被引量:2
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作者 Tian-Yi Xu Min Cui +5 位作者 Chengxi Zhao shang-wu zhou Tian-Le Zhang Hui-Yao Lin Fei Tong Da-Hui Qu 《CCS Chemistry》 CSCD 2024年第4期1071-1084,共14页
Harnessing photoresponsive behavior in organic crystals,such as shape and morphology deformation,on multiple scales is intriguing with respect to precise spatiotemporal operation,because dynamic deformations are promi... Harnessing photoresponsive behavior in organic crystals,such as shape and morphology deformation,on multiple scales is intriguing with respect to precise spatiotemporal operation,because dynamic deformations are promising in fabricating future intelligent devices.Here,we synthesized a new photoresponsive molecular crystal composed of dimethyl(E)-2-(3-(naphthalen-1-yl)allylidene)malonate((E)-DNAM)that undergoes E-to-Z photoisomerization accompanied by photoinduced crystal-to-liquid melting phase transition when exposed to visible light.Instead of expanding in bulk polycrystals,single-crystal(E)-DNAM rectangular microplates in an aqueous solution rapidly collapsed into liquid droplets,showing a remarkable drastic reduction in surface area of more than 97%after light illumination.We deduce that the unique microscopic morphology of microplates with high aspect ratios of length-tothickness reaching up to 1000 is mainly responsible for the photoinduced melting leading to drastic collapse.In addition,the cohesive forces of liquid photoproduct facilitate the overall deformations and transformation.We have shown a facile way to achieve the remarkable collapse of molecular crystals into droplets by photochemical reaction and phase transition. 展开更多
关键词 molecular crystals crystal-to-liquid transition extreme deformations PHOTOCHEMISTRY crystal engineering flexible crystals
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