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Keywords = 3-trifluoromethyl-2-pyrazolin-5-one

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7 pages, 1890 KB  
Communication
High Solid Fluorescence of a Pyrazoline Derivative through Hydrogen Bonding
by Liang Zhang, Jie Liu, Junkuo Gao, Feng Zhang and Liang Ding
Molecules 2017, 22(8), 1304; https://doi.org/10.3390/molecules22081304 - 4 Aug 2017
Cited by 14 | Viewed by 4671
Abstract
Pyrazoline and its derivatives often exhibit strong emissions in dilute solutions, but their emission intensity is often dramatically reduced in the solid state due to strong intermolecular interactions between neighboring molecules. In this report, we successfully synthesized a new pyrazoline 4-(3-(4-(decyloxy)phenyl)-1-(2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenyl)-4,5-dihydro-1H-pyrazol-5-yl)-N,N-diethylaniline (PPDPD), into [...] Read more.
Pyrazoline and its derivatives often exhibit strong emissions in dilute solutions, but their emission intensity is often dramatically reduced in the solid state due to strong intermolecular interactions between neighboring molecules. In this report, we successfully synthesized a new pyrazoline 4-(3-(4-(decyloxy)phenyl)-1-(2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenyl)-4,5-dihydro-1H-pyrazol-5-yl)-N,N-diethylaniline (PPDPD), into which seven fluorine (F) atoms were incorporated. In the solid state, PPDPD emits a strong blue light at λmax 430 nm with a fluorescence quantum yield of up to 41.3%. Single-crystal analysis showed the presence of intra/intermolecular C-H···F bonds that may impede molecular motion and block the non-radiative decay channel. Compound PPDPD therefore shows high emission efficiency in the solid state. Full article
(This article belongs to the Section Photochemistry)
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4 pages, 157 KB  
Short Note
4,4’-[(2-Chlorophenyl)methylene]bis[1-phenyl-3-(trifluoromethyl)-1H-pyrazol-5-ol]
by Changbin Guo and Wolfgang Holzer
Molbank 2009, 2009(3), M605; https://doi.org/10.3390/M605 - 16 Jul 2009
Cited by 2 | Viewed by 5668
Abstract
The reaction of 1-phenyl-3-trifluoromethyl-2-pyrazolin-5-one and 2-chlorobenzaldehyde leads to the title compound, which results from addition of a second pyrazolone unit to the primarily formed 1:1 condensation product. Detailed spectroscopic data (1H NMR, 13C NMR, 19F NMR, IR, MS) are presented. Full article
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