85292-41-7Relevant academic research and scientific papers
Symmetrical and non-symmetrical 2,5-diaryl-1,3,4-oxadiazoles: Synthesis and photophysical properties
Paraschivescu, Codru?a C.,H?dade, Niculina D.,Coman, Anca G.,Gautier, Arnaud,Cisnetti, Federico,Matache, Mihaela
, p. 3961 - 3964 (2015/06/08)
We report herein the synthesis of 2,5-diaryl-1,3,4-oxadiazoles containing both electron-donating and withdrawing substituents as well as bis- and tris-2,5-disubstituted-1,3,4-oxadiazoles containing electron-donating substituents. The photophysical properties of the synthesized compounds were studied using UV-Vis and fluorescence spectroscopy. The aryl substitution pattern was found to have a marked impact on both luminescence efficiency and other photophysical properties. An increase in the number of electron-donating groups and/or the number of heterocyclic rings provided a red shift of the emission maxima, as well as an increase of the Stokes shifts. The same effect was observed for mono-1,3,4-oxadiazoles containing push-pull substituents on the aryl rings.
Research in the 2,5-Diaryl-1,3,4-oxadiazole Series. 1. Electronic Structures and Spectral-Luminescence Properties of Substituted 2,5-Diphenyl-1,3,4-oxadiazoles
Popova, N. A.,Yushko, E. G.,Krasovitskii, B. M.,Minkin, V. I.,Lyubarskaya, A. E.,Gol'dberg, M. L.
, p. 22 - 28 (2007/10/02)
The dependence of the spectral-luminescence properties of substituted 2,5-diphenyl-1,3,4-oxadiazoles on the electronic nature of the substituents was studied.Experimental and theoretical studies confirm the electron-acceptor character of the oxadiazole ring and constitute evidence for the rather effective transmission of the electronic effects through the heteroring.
