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Published on: October 18, 2018
Competition between Arene-Perfluoroarene and Charge-Transfer Interactions in Organic Light-Harvesting Systems
Yanqiu Sun1,2, Yilong Lei3, Liangsheng Liao4
1Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing, 100190, P.R. China.
Abstract:
Two typical types of luminescent organic cocrystals comprising pyrene-octafluoronaphthalene (pyrene-OFN) and pyrene-1,2,4,5-tetracyanobezene (pyrene-TCNB) were developed by a simple supramolecular assembly strategy. The cocrystals exhibit distinct optical properties because of their different intermolecular interaction modes; that is, arene-perfluoroarene (AP) and charge-transfer (CT) interactions. Unexpectedly, a pyrene-TCNB system with strong CT interactions was incorporated into a pyrene-OFN host as a robust guest to generate white-light emission (WLE). In the supramolecular cocrystal system, an efficient energy-transfer process from pyrene-OFN to pyrene-TCNB occurred because of the well-matched spectra of the constituents and a desirable energy donor/acceptor (D/A) distance. The present competitive intermolecular interaction strategy could be applied to the fabrication of more complicated organic light-harvesting systems.
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