Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature  

作　　者：Bin Xia Qian Gao Zhen-Peng Hu Qing-Lun Wang Xue-Wei Cao Wei Li You Song Xian-He Bu 

机构地区：[1]College of Chemistry,State Key Lab of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China [2]School of Physics,Nankai University,Tianjin 300071,China [3]School of Materials Science and Engineering,Tianjin Key Lab of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China [4]State Key Lab of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China

出　　处：《Research》2021年第1期265-276,共12页研究（英文）

基　　金：support by the National Natural Science Foundation of China(Nos.91856124,22035003,21771111,and 21973038);the Programme of Introducing Talents of Discipline to Universities(B18030).

摘　　要：Stimulus-responsive metal-organic frameworks(MOFs)can be used for designing smart materials.Herein,we report a family of rationally designed MOFs which exhibit photoresponsive chiroptical and magnetic properties at room temperature.In this design,two specific nonphotochromic ligands are selected to construct enantiomeric MOFs,{Cu_(2)(L-mal)_(2)(bpy)_(2)(H_(2)O)·3H_(2)O}n(1)and{Cu_(2)(D-mal)_(2)(bpy)_(2)(H_(2)O)·3H_(2)O}_(n)(2)(mal=malate,bpy=4,4’−bipyridine),which can alter their color,magnetism,and chiroptics concurrently in response to light.Upon UV or visible light irradiation,long-lived bpy−radicals are generated via photoinduced electron transfer(PET)from oxygen atoms of carboxylates and hydroxyl of malates to bpy ligands,giving rise to a 23.7%increase of magnetic susceptibility at room temperature.The participation of the chromophores(-OH and-COO^(−))bound with the chiral carbon during the electron transfer process results in a small dipolar transition;thus,the Cotton effects of the enantiomers are weakened along with a photoinduced color change.This work demonstrates that the simultaneous responses of chirality,optics,and magnetism can be achieved in a single compound at room temperature and may open up a new pathway for designing chiral stimuli-responsive materials.

关 键 词：temperature. materials. OPTICS 

分 类 号：O62[理学—有机化学]