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Liquid crystalline imidazolium salts bearing 5-phenylpyrimidine: dependence of mesomorphic properties on spacer lengths, terminal N -alkyl group and counterions.
- Source :
- Liquid Crystals; Nov2011, Vol. 38 Issue 11/12, p1515-1529, 15p
- Publication Year :
- 2011
-
Abstract
- New imidazolium salts bearing substituted 5-phenylpyrimidine mesogenic groups were synthesised and their mesomorphic properties were studied by differential scanning calorimetry, optical microscopy and powder X-ray diffraction methods (WAXS, SAXS). The parent 5-phenylpyrimidines with the terminal bromide group at the alkoxy spacer exhibited low clearing points and smectic mesophases in narrow temperature ranges. The incorporation of the N-alkylimidazolium cationic core, connected with 5-phenylpyrimidine via an alkoxy spacer, remarkably improved the stability of the mesophases. The imidazolium salts with 5-phenylpyrimidine group formed smectic A phases, stable over broad temperature intervals. The influences of the counteranion, the length of terminal alkyl group and alkoxy spacer on the mesomorphic behaviour of the 5-phenylpyrimidine substituted N-alkylimidazolium salts were investigated in detail. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02678292
- Volume :
- 38
- Issue :
- 11/12
- Database :
- Complementary Index
- Journal :
- Liquid Crystals
- Publication Type :
- Academic Journal
- Accession number :
- 67366414
- Full Text :
- https://doi.org/10.1080/02678292.2011.614699