期刊
DYES AND PIGMENTS
卷 195, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109710
关键词
Covalent organic framework; Fluorescence enhancement; Al3+ detection; Rotation prohibition; Sensing
资金
- Open Fund of the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2020-KF-17]
- Open Fund of Beijing National Laboratory for Molecular Sciences [BNLMS201842]
- Postgraduate Innovation Foundation from Wuhan Institute of Technology [CX202067]
- City University of Hongkong
- 111 Project [D20015]
The fluorescence of p-methoxyl group-substituted imine-based COFs can be dramatically enhanced after coordination with Al3+, while o-methoxyl group-substituted COF does not exhibit this phenomenon, possibly due to the rotation of uncoordinated C--N and C-O bonds on one side.
The fluorescence of two-dimensional (2D) covalent organic frameworks (COFs) are generally quenched by the strong layer-layer it-it stacking or the intramolecular rotation. However, the latter effect can be reduced if the intramolecular rotation in COFs can be restricted through the selective coordination with metal ions or small molecules. Herein, we demonstrate that the fluorescence of p-methoxyl group-substituted imine-based COFs can be dramatically enhanced after coordination with Al3+ compared with other metal cations (i.e. Fe3+, Ni2+, Cd2+, Mn2+, Co2+, Zn2+, Hg2+, Ba2+, Mg2+ and K+) while o-methoxyl group-substituted one has no such phenomena, which might be due to the rotation of the uncoordinated C--N and C-O bonds in one side.
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