Journal
CHEMICAL COMMUNICATIONS
Volume 54, Issue 19, Pages 2349-2352Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cc09866a
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Funding
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP16-2015-02]
- Shenzhen Peacock Plan [KQTD2016053112042971]
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The strong pi-pi 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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