Visible-Light-Responsive Crystalline Solids by Equipping Covalent Organic Frameworks with Donor-Acceptor Stenhouse Adducts  

作　　者：Yongli Duan Fanxi Sun Ang Gao Zhen Wang Xiaoyu Xiong Lijun Mao Bo Han Chao He Xu Deng Yonghao Zheng Dongsheng Wang 

机构地区：[1]School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan,610054 China [2]State Key Laboratory of Southwestern Chinese Medicine Resources,School of Pharmacy,Chengdu University of Traditional Chinese Medicine,Chengdu,Sichuan,610041 China [3]College of Polymer Science and Engineering,Sichuan University,Chengdu,Sichuan,610065 China [4]Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu,Sichuan,610054 China [5]Institute of Electronic and Information Engineering of UESTC in Guangdong,Dongguan,Guangdong,523808 China

出　　处：《Chinese Journal of Chemistry》2023年第19期2469-2475,共7页中国化学（英文版）

基　　金：support from the Na-tional Natural Science Foundation of China(52203134,11772271,12272085);the Open Research Fund of Chengdu University of Traditional Chinese Medicine State Key Laboratory Southwestern Chinese Medicine Resource.

摘　　要：Controlling properties of crystalline solids by light remains a challenge because the lack of intrinsic structural flexibility limits the necessary molecular mobility for photoisomerization. In this work, we reported a series of visible-light-responsive covalent organic frameworks (COFs) by introducing donor-acceptor Stenhouse adducts (DASAs) with various electron-withdrawing moieties via a post-modified strategy. The DASAs-functionalized COFs exhibit distorted honeycomb layered topology with long-range periodicity. The DASAs grafted on the skeletons are pointing into the nanopores of COFs, which weakens intermolecular aggregation and ensures sufficient free volume to undergo reversible isomerization between linear and cyclic states. Furthermore, the crystalline and optical properties of COFs as well as the geometrical size and hydrophilicity inside the nanopores were reversibly controlled by alternating visible light irradiation and heat. Finally, methyl violet was used as the cargo molecules to be immobilized into the nanopores of COFs, which showed fast release under controlling of visible light.

关 键 词：Covalent organic frameworks Donor-acceptor stenhouse adducts PHOTORESPONSIVE Crystalline solids Cargo release lsomerization 

分 类 号：O62[理学—有机化学]