Study on the thermotropic properties of highly fluorinated 1,2,4-oxadiazolylpyridinium salts and their perspective applications as ionic liquid crystals.
- Authors: LO CELSO F; PIBIRI I; TRIOLO A; TRIOLO R; PACE A; BUSCEMI S; VIVONA N
- Publication year: 2007
- Type: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/7732
Abstract
A new series of fluorinated salts, iodides and trifluoromethanesulfonates, was synthesized from perfluoroalkylated 1,2,4-oxadiazolylpyridines. Their thermotropic properties were investigated by combined temperature resolved small angle and wide angle X-ray scattering, differential scanning calorimetry and polarised optical microscopy. The UV–visible and photoluminescence properties were studied for all compounds. The results showed for two compounds the existence of an enantiotropic mesomorphic smectic liquid crystal phase. All iodides showed thermochromism phenomena suggesting prospective applications in optoelectronics.