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

Author:

Duan Yongli1,Sun Fanxi1,Gao Ang1,Wang Zhen1,Xiong Xiaoyu1,Mao Lijun1,Han Bo2,He Chao3,Deng Xu4,Zheng Yonghao1,Wang Dongsheng15

Affiliation:

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

Abstract

Comprehensive SummaryControlling 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.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry

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