Highly Emissive Covalent Organic Frameworks

Highly luminescent covalent organic frameworks (COFs) are rarely achieved because of the aggregation-caused quenching (ACQ) of π–π stacked layers. Here, we report a general strategy to design highly emissive COFs by introducing an aggregation-induced emission (AIE) mechanism. The integration of AIE-...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 138; no. 18; pp. 5797 - 5800
Main Authors Dalapati, Sasanka, Jin, Enquan, Addicoat, Matthew, Heine, Thomas, Jiang, Donglin
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 11.05.2016
Subjects
ammonia
chemical bonding
luminescence
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Summary:Highly luminescent covalent organic frameworks (COFs) are rarely achieved because of the aggregation-caused quenching (ACQ) of π–π stacked layers. Here, we report a general strategy to design highly emissive COFs by introducing an aggregation-induced emission (AIE) mechanism. The integration of AIE-active units into the polygon vertices yields crystalline porous COFs with periodic π-stacked columnar AIE arrays. These columnar AIE π-arrays dominate the luminescence of the COFs, achieve exceptional quantum yield via a synergistic structural locking effect of intralayer covalent bonding and interlayer noncovalent π–π interactions and serve as a highly sensitive sensor to report ammonia down to sub ppm level. Our strategy breaks through the ACQ-based mechanistic limitations of COFs and opens a way to explore highly emissive COF materials.
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ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/jacs.6b02700