College of Materials Science and Engineering and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.
Jiangsu Province Engineering Research Centre of Agricultural Breeding Pollution Control and Resource, Yancheng Teachers University, Yancheng 224007, China.
Chem Commun (Camb). 2022 Aug 30;58(70):9798-9801. doi: 10.1039/d2cc03498k.
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 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.
二维 COF 中常见的荧光猝灭现象是由于层间强烈的π-π堆积或分子内旋转引起的非辐射衰减。在这里，我们报告了一种构建具有高光致发光二维 COF 纳米片的刚柔平衡策略，即将刚性荧光分子节点与柔性非平面构筑块集成在一起。所制备的 COF 纳米片，称为 TPE-DBC-COF，在常见的有机溶剂中，特别是在四氢呋喃中（43.5%），实现了极高的 PLQY。此外，所制备的 TPE-DBC-COF 对盐酸四环素表现出优异的灵敏度和选择性，以及高循环稳定性，因此可作为一种高效荧光传感器，用于检测低至 ppm 级别的盐酸四环素。
