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Updated: Sep 1, 2025
Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
Published on: April 25, 2025
A rigidity-flexibility balance strategy enabling highly photoluminescent two-dimensional covalent organic framework
Hao Wang1, Chengtao Gong1, Peng Jin1
1College of Materials Science and Engineering and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China. ywpeng@zjut.edu.cn.
Abstract:
The fluorescence quenching phenomenon commonly found in two-dimensional COFs is due to either the strong interlayer π-π stacking or the non-radiative decay caused by intramolecular rotation. Here, we report a rigidity-flexibility balance strategy for constructing highly photoluminescent 2D COF nanosheets via the integration of rigid fluorescent molecular nodes with flexible non-planar building blocks. The prepared COF nanosheets, termed TPE-DBC-COF, achieve extremely high PLQY in common organic solvents, especially in tetrahydrofuran (43.5%). Besides, the prepared TPE-DBC-COF exhibits excellent sensitivity and selectivity to tetracycline hydrochloride and high cycling stability, so it can be used as a high-efficiency fluorescent sensor for the detection of tetracycline hydrochloride down to the ppm level.
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