3 years ago

Competition between Arene–Perfluoroarene and Charge-Transfer Interactions in Organic Light-Harvesting Systems

Competition between Arene–Perfluoroarene and Charge-Transfer Interactions in Organic Light-Harvesting Systems
Yanqiu Sun, Yilong Lei, Wenping Hu, Liangsheng Liao
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. Luminescent lightsabers: Stable white light-emitting crystals containing pyrene–octafluoronaphthalene (pyrene–OFN) cocrystals doped with pyrene–1,2,4,5- tetracyanobenzene (pyrene–TCNB) integrate competitive intermolecular charge-transfer and arene–perfluoroarene interactions. Efficient energy transfer from the charge-transfer host to the arene–perfluoroarene dopant is observed.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702084

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