Construction of Chiral Covalent Organic Frameworks Through a Linker Decomposition Chiral Induction Strategy for Circularly Polarized Light Detection

作     者：Dr. Xihao Tang Dr. Jiajia Zha Xueying Wu Jingyi Tong Qianfeng Gu Kai Zhang Prof. Yuwei Zhang Prof. Shengrun Zheng Prof. Jun Fan Prof. Weiguang Zhang Prof. Qichun Zhang Prof. Chaoliang Tan Prof. Songliang Cai 

作者机构：GDMPA Key Laboratory for Process Control and Quality Evaluation of Chiral Pharmaceuticals Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine School of Chemistry South China Normal University 510006 Guangzhou P. R. China These authors contributed equally. Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road 999077 Hong Kong SAR P. R. China Department of Electrical Engineering City University of Hong Kong Tat Chee Avenue 83 Kowloon 999077 Hong Kong SAR P. R. China Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue 83 Kowloon 999077 Hong Kong SAR P. R. China SCNU Qingyuan Institute of Science and Technology Innovation Co. Ltd. 511517 Qingyuan P. R. China Department of Chemistry & Center of Super-Diamond and Advanced Films (COSDAF) & Hong Kong Institute of Clean Energy (HKICE) City University of Hong Kong 999077 Hong Kong SAR P. R. China 

出 版 物：《Angewandte Chemie》 

年 卷 期：2024年第137卷第1期

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

主　　题：chiral covalent organic frameworks circularly polarized light detection linker decomposition chiral induction propeller-like conformation 

摘      要：Exploring new strategies for construction of chiral covalent organic frameworks (COFs) is of paramount importance yet remains a challenge. Herein, we report the rational design and construction of chiral COFs through a linker decomposition chiral induction (LDCI) strategy. Three pairs of azine-linked chiral COFs are successfully synthesized by the condensation reactions of C 3 -symmetric 4,4′,4′′-(1,3,5-triazine-2,4,6-triyl)tribenzaldehyde (Tz) with flexible chiral dihydrazide linkers derived from malic acid, aspartic acid and tartaric acid, respectively. Remarkably, upon complete or partial decomposition from flexible chiral dihydrazides to hydrazine during COF synthesis, the homochirality of these COFs, originating from the single-handedness conformation of propeller-like Tz cores, is well preserved. Such a stereoselective chiral memory realized via the LDCI strategy is confirmed by time-dependent powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) and diffuse reflectance circular dichroism (DRCD). Moreover, the resultant azine-linked chiral COFs are used as the active materials to fabricate photodetectors to directly distinguish circularly polarized light (CPL), showing impressive recognition performances on the identification of left-handed circularly (LHC) and right-handed circularly (RHC) polarized lights. Notably, the residual undecomposed flexible chiral linkers within the COFs are found to be conducive to improving the polarization discrimination ratio. This work highlights LDCI as a new and effective strategy for constructing homochiral COFs with promising future in chiral optical application.