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Highly photoluminescent two-dimensional imine-based covalent organic frameworks for chemical sensingGao, Qiang; Li, Xing; Ning, Guo-Hong; Leng, Kai; Tian, Bingbing; Liu, Cuibo; Tang, Wei; Xu, Hai-Sen; Loh, Kian Ping
Chemical communications (Cambridge, England), 2018, Volume: 54, Issue: 19Journal Article
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).
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