Studying the fluorescence conversion in organic charge transfer cocrystals of chalcone derivatives and TCNB. (7th November 2017)

• Record Type: Journal Article
• Authors: Zhao, Kun; Wang, Huimin; Sun, Hao; Tian, Wen; Yang, Shanguang; Liu, Jingjing; Peng, Jing; Wang, Mingliang
• Is Part Of: New journal of chemistry. Volume 41:Number 23(2017)
• Page Start: 14610
• Page End: 14617
• Publication Date: 2017-11-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj03127k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Four binary co-crystals were mainly formed by halogen bonds and charge transfer interactions, which generated remarkable optical properties. Abstract : Four binary charge-transfer cocrystals (I a, I b, II andIII ) 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.