Positive/Negative Phototropism:Controllable Molecular Actuators with Different Bending Behavior  

作　　者：Haoran Wang Jiapeng Liu Kaiqi Ye Qiyao Li Jianyu Zhang Hao Xing Peifa Wei Jingbo Sun Francesco Ciucci Jacky WYLam Ran Lu Ben Zhong Tang 

机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun [2]Department of Chemistry,Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction,Institute for Advanced Study,The Hong Kong University of Science and Technology,Hong Kong [3]Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong [4]Department of Chemical and Biomolecular Engineering,The Hong Kong University of Science and Technology,Hong Kong

出　　处：《CCS Chemistry》2021年第4期1491-1500,共10页中国化学会会刊（英文）

基　　金：The authors are grateful for financial support from the National Science Foundation of China(nos.51773067 and 21788102);the Open Project of State Key Laboratory of Supramolecular Structure and Materials(no.sklssm202019);the Research Grants Council of Hong Kong(no.C6009-17G);the Innovation of Technology Commission(no.ITC-CNERC14SC01);the National Key Research and Development Program of China(no.2018YFE0190200).

摘　　要：Herein,a series of molecular actuators based on the crystals of(E)-2-(4-fluorostyryl)benzo[d]oxazole(BOAF4),(E)-2-(2,4-difluorostyryl)benzo[d]oxazole(BOAF24),(E)-2-(4-fluorostyryl)benzo[d]thiazole(BTAF4),and(E)-2-(2,4-difluorostyryl)benzo[d]thiazole(BTAF24)showed unique bending behavior under UV irradiation.The one-dimensional(1D)crystals of BOAF4 and BTAF4 bent toward light,whereas those of BOAF24 and BTAF24 bent away from light.Although the chemical structures of these compounds are similar,the authors found that F···H–C interaction played a key role in the different molecular packing in structures crystals,which led to the positive/negative phototropism of the actuators.Moreover,theoretical calculations were carried out to reveal the mechanical properties of the crystals.Taking advantage of these photomechanical properties,the authors achieved the potential application in pushing objects,as well as enriching and removing pollutants.Hence,the molecular actuators with different bending behavior could be fabricated by introducing different number of F atom,which may open a novel gate for crystal engineering.

关 键 词：crystal engineering actuators PHOTOTROPISM [2+2]cycloaddition photomechanical effects 

分 类 号：O62[理学—有机化学]