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Studying the fluorescence conversion in organic charge transfer cocrystals of chalcone derivatives and TCNB

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Abstract

Four binary charge-transfer cocrystals (Ia, Ib, II and III) were engineered by a solvent evaporation method, involving 1-phenyl-3-(1-pyrenyl)prop-2-en-1-one (PPPO, I), 3-(1-pyrenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (PMPPO, II) and 3-(1-pyrenyl)-1-(4-chlorophenyl)prop-2-en-1-one (PCPPO, III) as electron donors (D) and 1,2,4,5-benzenetetracarbonitrile (TCNB) as an electron acceptor (A). The structures and optical properties of these complexes were investigated by single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), UV-Vis absorption spectroscopy and fluorescence spectroscopy. CrystalExplorer was also used to analyze the surface force of the crystals. The studies showed that the fluorescence of all of these cocrystals exhibits a significant red-shift, and this phenomenon is caused by charge-transfer (CT) interactions between the donor and acceptor. In addition, the differences in fluorescence to the pristine molecules may provide these CT cocrystals with a wide range of applications in the prospective field of opto-electronic materials.

Graphical abstract: Studying the fluorescence conversion in organic charge transfer cocrystals of chalcone derivatives and TCNB

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Publication details

The article was received on 21 Aug 2017, accepted on 19 Oct 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03127K
Citation: New J. Chem., 2017, Advance Article
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    Studying the fluorescence conversion in organic charge transfer cocrystals of chalcone derivatives and TCNB

    K. Zhao, H. Wang, H. Sun, W. Tian, S. Yang, J. Liu, J. Peng and M. Wang, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ03127K

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