Liquid crystalline imidazolium salts bearing 5-phenylpyrimidine: dependence of mesomorphic properties on spacer lengths, terminal <i>N</i> -alkyl group and counterions
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Bibliographic record
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.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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