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Chemistry

Title:		"Organic Crystals with Response to Multiple Stimuli: Mechanical Bending, Acid-Induced Bending and Heating-Induced Jumping"
Author(s):		Wu W; Chen K; Zhang X; Wang T; Li S; Zhao H; Zhou L; Huang X; Hao H;
Address:		"National Engineering Research Centre of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore. Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin, 300072, P. R. China. School of Chemical Engineering and Technology, Hainan University, Haikou, 570228, P. R. China"
Journal Title:		Chemistry
Year:		2023
Volume:		20221114
Issue:		1
Page Number:		e202202598 -
DOI:		10.1002/chem.202202598
ISSN/ISBN:		1521-3765 (Electronic) 0947-6539 (Linking)
Abstract:		"Multiple stimuli-responsive molecular crystals are attracting extensive attentions due to their potential as smart materials, such as molecular machines, actuators, and sensors. However, the task of giving a single crystal multiple stimuli-responsive properties remains extremely challenging. Herein, we found two polymorphs (Form O and Form R) of a Schiff base compound, which could respond to multiple stimuli (external force, acid, heat). Form O and Form R have different elastic deformability, which can be attributed to the differences in the molecular conformation, structural packing and intermolecular interactions. Moreover, both polymorphs exhibit reversible bending driven by volatile acid vapor, which we hypothesize is caused by reversible protonation reaction of imines with formic acid. In addition, jumping can be triggered by heating due to the significant anisotropic expansion. The integration of reversible bending and jumping into one single crystal expands the application scope of stimuli-responsive crystalline materials"
Keywords:		*Heating Anisotropy *Gases Hot Temperature Imines chemical deformation elastic deformation jumping crystal multi-stimuli responses single crystal;
Notes:		"MedlineWu, Wenbo Chen, Kui Zhang, Xiunan Wang, Ting Li, Shuyu Zhao, Hongtu Zhou, Lina Huang, Xin Hao, Hongxun eng 22108196/National Natural Science Foundation of China/ Germany 2022/10/11 Chemistry. 2023 Jan 2; 29(1):e202202598. doi: 10.1002/chem.202202598. Epub 2022 Nov 14"