Journal
LIQUID CRYSTALS
Volume 38, Issue 6, Pages 679-688Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2011.568638
Keywords
liquid crystals; 1,3,4-oxadiazoles; benzenetrisamides; mesophases; hexagonal columnar phase
Funding
- FONDECYT [1070535]
- Direccion de Investigacion, Universidad de Concepcion
- MICINN-FEDER [CTQ 2009-09030]
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Novel liquid crystal materials based on 1,3,5-benzenetrisamide derivatives with three pendant 2-phenyl-5-(mono-, di-, and/or tri-n-alkoxyphenyl)-1,3,4-oxadiazole arms (Ia-c, IIa-c) were prepared. The mesomorphic properties of these compounds were characterised and studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The formation of a columnar mesophase was found to be dependent on the number of alkoxy side chains. The compounds Ib and IIb, with a total of six alkoxy chains, and compounds Ic and IIc, with nine alkoxy chains, exhibited an enantiotropic hexagonal columnar (Col(h)) phase with high isotropisation temperatures; however, compounds Ia and IIa with a total of three alkoxy chains formed a crystalline phase. Compounds IIb and c were room temperature liquid crystals.
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