A Visible Light Responsive Smart Covalent Organic Framework with a Bridged Azobenzene Backbone

• Published in: Macromolecular rapid communications. Vol. 45; no. 5; pp. e2300506 - n/a
• Main Authors: Qiang, Liang, Bai, Hao, Li, Xin‐yi, Yang, Hai‐lin, Gong, Cheng‐bin, Tang, Qian
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.03.2024
• Subjects: 3,3′‐diamino‐2,2′‐ethylene‐bridged azobenzene; Azo compounds; Benzene; carbon dioxide capture; Controlled release; Covalence; covalent organic frameworks; reversible photoswitching; carbon dioxide capture; reversible photoswitching; covalent organic frameworks; 3,3′-diamino-2,2′-ethylene-bridged azobenzene
• ISSN: 1022-1336; 1521-3927
• DOI: 10.1002/marc.202300506

Condensation of 3,3′‐diamino‐2,2′‐ethylene‐bridged azobenzene with 1,2,4,5‐tetrakis‐(4‐formylphenyl) benzene produces a visible light responsive porous 2D covalent organic framework, COF‐bAzo‐TFPB, with a large surface area, good crystallinity, and thermal and chemical stability. The results demonstrate that the elaborated designed linker can make azo unit on the COF‐bAzo‐TFPB skeleton undergo reversible photoisomerization. This work expands the application scope of covalent organic frameworks in photo‐controlled release, uptake of guest molecules, dynamic photoswitching, and UV‐sensitive functions. A visible light responsive porous 2D covalent organic framework, COF‐bAzo‐TFPB, is fabricated by condensation of 3,3′‐diamino‐2,2′‐ethylene‐bridged azobenzene with 1,2,4,5‐tetrakis‐(4‐formylphenyl) benzene. COF‐bAzo‐TFPB shows large surface area, good crystallinity, and thermal and chemical stability. Most importantly, the elaborated designed linker can make azo unit on the COFs skeleton undergo reversible photoisomerization.