文献类型：期刊文献

英文题名：Photoinduced dynamic gelation and deformations based on molecular crystal microrods stimulated by Z-to-E photoisomerization

作者：Li, Yu-Hao[1,2];Liu, Jiang-Tao[1,2];Sun, Ya-Bing[1,2];Huang, Yun-Peng[1,2];Hou, Jia-Wang[1,2];Xu, Yikai[1,2];Zhang, Chen-Chen[1,2];Xu, Tian-Yi[1,2];Tong, Fei[1,2]

机构：[1]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol, Key Lab Adv Mat & Joint Int Res Lab Precis Chem &, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Dynam Chem Inst Fine Chem, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2026

卷号：18

期号：2

起止页码：1007

外文期刊名：NANOSCALE

收录：;EI(收录号：20255119734763);WOS:【SCI-EXPANDED(收录号:WOS:001636724400001)】；

基金：This work was supported by the National Natural Science Foundation of China (22375063 and 22405089), Science and Technology Commission of Shanghai Municipality (23JC1401700), the Programme of Introducing Talents of Discipline to Universities (grant no. B16017) and the Fundamental Research Funds for the Central Universities. The authors also thank the Analysis and Testing Center of East China University of Science and Technology for help with the material characterization.

语种：英文

外文关键词：Gelation - Gels - Molecular crystals - Silica

摘要：Transforming a rigid photoresponsive molecular crystal composed of anisotropic molecular packing structures into a highly disordered and soft gel using low-intensity visible light illumination is intriguing but remains a challenge. Here, we demonstrated that the slender molecular crystal microrods of an anthracene derivative (APA) rapidly (<= 1 min) transform into amorphous gels, accompanied by vigorous mechanical motions, including bending, twisting, expansion, and curling, under relatively low-intensity visible light (450 nm, 20 mW cm-2) illumination. APA molecules in a highly crystalline microrod can undergo effective Z-to-E photoisomerization when exposed to visible light, causing significant molecular configuration changes to destroy the rigid crystal lattice and drive the microrod to move and deform drastically. When placed in an aqueous environment, an APA microrod rapidly (similar to 30 s) transforms into a gel and expands by incorporating surrounding water molecules. The resulting photoproduct gels can also engulf and gather microscopic particles, such as polystyrene microspheres, silica nanoparticles, and silver (Ag) and gold (Au) nanoparticles, due to the extensively inflated volume after gelation. As a result, the dynamic Z-to-E isomerization in the APA microrods can be in situ characterized using a microscope equipped with laser Raman spectroscopy measurements by incorporating Ag nanoparticles to amplify signals. Our research provides a facile method for achieving a rapid phase transition from a stiff material to a highly flexible state and also offers a new approach for instantaneously monitoring the dynamic photochemistry of responsive materials.