Highly photoluminescent two-dimensional imine-based covalent organic frameworks for chemical sensing

The strong π-π interactions in the stacking layers of two-dimensional covalent organic frameworks (2D-COFs), together with rotationally labile imine linkages, make most of the solid state imine-linked COFs non-fluorescent due to fluorescence quenching processes. Here, we report the successful synthe...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2018, Vol.54 (19), p.2349-2352
Main Authors: Gao, Qiang, Li, Xing, Ning, Guo-Hong, Leng, Kai, Tian, Bingbing, Liu, Cuibo, Tang, Wei, Xu, Hai-Sen, Loh, Kian Ping
Format: Article
Language:English
Subjects:
Chemical sensors
Explosives detection
Fluorescence
Photoluminescence
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Summary:The strong π-π interactions in the stacking layers of two-dimensional covalent organic frameworks (2D-COFs), together with rotationally labile imine linkages, make most of the solid state imine-linked COFs non-fluorescent due to fluorescence quenching processes. Here, we report the successful synthesis of highly photoluminescent imine-based 2D-COFs by integrating a non-planar building unit with a pyrene-based unit and transforming the COF into spherical, sub-micron particles. High photoluminescence quantum yields (PLQY) were achieved with COF sub-micron particles dispersed in organic solvents. The as-prepared COF sub-micron particles can be used as a chemical sensor for the detection of explosive chemicals, with high sensitivity and selectivity (up to ppm level). Highly photoluminescent imine-based 2D-COFs with high photoluminescence quantum yields (up to 21.1%) were achieved by integrating a non-planar building unit with a pyrene-based unit and transforming the COF into spherical, sub-micron particles.
ISSN:1359-7345
1364-548X
DOI:10.1039/c7cc09866a