Designed synthesis of stable light-emitting two-dimensional sp2 carbon-conjugated covalent organic frameworks

Enquan Jin, Juan Li, Keyu Geng, Qiuhong Jiang, Hong Xu, Qing Xu and Donglin Jiang ()
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Enquan Jin: National University of Singapore
Juan Li: National University of Singapore
Keyu Geng: National University of Singapore
Qiuhong Jiang: National University of Singapore
Hong Xu: National University of Singapore
Qing Xu: National University of Singapore
Donglin Jiang: National University of Singapore

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Covalent organic frameworks enable the topological connection of organic chromophores into π lattices, making them attractive for creating light-emitting polymers that are predesignable for both the primary- and high-order structures. However, owing to linkages, covalent organic frameworks are either unstable or poor luminescent, leaving the practical synthesis of stable light-emitting frameworks challenging. Here, we report the designed synthesis of sp2 carbon-conjugated frameworks that combine stability with light-emitting activity. The C=C linkages topologically connect pyrene knots and arylyenevinylene linkers into two-dimensional all sp2 carbon lattices that are designed to be π conjugated along both the x and y directions and develop layer structures, creating exceptionally stable frameworks. The resulting frameworks are capable of tuning band gap and emission by the linkers, are highly luminescent under various conditions and can be exfoliated to produce brilliant nanosheets. These results suggest a platform based on sp2 carbon frameworks for designing robust photofunctional materials.

Date: 2018
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DOI: 10.1038/s41467-018-06719-8

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