Pyridinium and imidazolium 1,3,4-oxadiazole ionic liquid crystals: a thermal and photophysical systematic investigation was written by Westphal, Eduard;Henrique da Silva, Danilo;Molin, Fernando;Gallardo, Hugo. And the article was included in RSC Advances in 2013.Product Details of 15420-02-7 This article mentions the following:
The authors present the synthesis and complete structural characterization of twenty five 1,3,4-oxadiazole mols. (ionic and nonionic) with some systematic structural variations, such as number of counterions, number of alkoxy chains, alkyl chain size, type of counterion and its position on the mol. The thermal and photophys. properties for all compounds were studied allowing a complete and interesting simultaneous study of the effect of structural changes on these properties. Every parameter studied affected both the thermal and photophys. properties. For these bent core mols., the liquid crystalline behavior was observed only for compounds containing one counterion, SmA (monolayer or bilayer) being the predominant phase. The neutral (nonionic) compounds and the imidazolium derivatives showed emission at 閳?60 nm and a high quantum yield, while most of the pyridinium derivatives showed emission at 閳?30 nm, a low quantum yield and a complex photophys. behavior. In all cases, the quantum yield for the different counterions follows the sequence ClO4– > BF4– > DS– > NO3– > Br–(I–). In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7Product Details of 15420-02-7).
2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Product Details of 15420-02-7