1. Fluorescent difluoroboron covalent organic frameworks via N, O-bidentate ligation.
- Author
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Yan, Yaqian, Xia, Tian, Zhao, Yuxiang, Sun, Haochen, Li, Chaokun, Fan, Ruimei, Wang, Wenxin, and Chen, Qi
- Subjects
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BORON trifluoride , *ELECTRON distribution , *FLUORESCENCE , *ORGANOPLATINUM compounds , *CHELATES , *POROUS materials - Abstract
[Display omitted] • A new fluorescent covalent organic frameworks was synthesized. • N , O -bidentate ligation was be used to combine difluoroboron. • 50% B-COF exhibited red fluorescence under ultraviolet excitation. The multi-dentate chelate ligands containing N and O atoms have good chelating ability to boron trifluoride and their complexes show good fluorescence properties. In this work, a fluorescent covalent organic framework (COF) with good crystallinity and porosity, 50% B-COF, was successfully synthesized by coordination of starting COFs 50% COF-OH with boron trifluoride diethyl etherate via N, O-bidentate ligation. Imine bonds are highly polarized. The coordination of nitrogen and boron changes the electron cloud distribution of imine bonds, causing the non-fluorescent 50% COF-OH to be transformed into fluorescent 50% B-COF. 50% B-COF exhibited red fluorescence under ultraviolet excitation. This work provides a new strategy for the design of fluorescent COFs. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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