文献类型：期刊文献

英文题名：Visible Light-Induced Collapse of Molecular Microcrystals into Droplets by E-to-Z Photoisomerization and Melting Phase Transition

作者：Xu, Tian-Yi[1,2];Cui, Min[1,2];Zhao, Chengxi[1,2];Zhou, Shang-Wu[1,2];Zhang, Tian-Le[1,2];Lin, Hui-Yao[1,2];Tong, Fei[1,2];Qu, Da-Hui[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：6

期号：4

起止页码：1071

外文期刊名：CCS CHEMISTRY

收录：WOS:【ESCI(收录号:WOS:001060915400001)】；

基金：This work was supported by the National Natural Science Foundation of China (grant nos. 22105071, 22220102004, 22025503, and 22335004), the Shanghai Municipal Science and Technology Major Project (grant no. 2018SHZDZX03), the Innovation Program of Shanghai Municipal Education Commission (2023ZKZD40), the Fundamental Research Funds for the Central & nbsp;Universities, the Programme of Introducing Talents of Discipline to Universities (grant no. B16017), the Science and Technology Commission of Shanghai Municipality (grant nos. 21JC1401700 and 22ZR1417100), the Shanghai Sailing Program (21YF1409200), and the Starry Night Science Fund of Zhejiang University Shanghai Institute for Advanced Study (grant no. SN-ZJU-SIAS-006). C. Z. gratefully acknowledges the financial support from the China Scholarship Council (202106745008).

语种：英文

外文关键词：sition; extreme deformations; photochemistry; crys-tal engineering; flexible crystals

摘要：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 photo responsive 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-to thickness 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.