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Columnar liquid crystalline benzenetrisamides with pendant 1,3,4-oxadiazole groups

AuthorsBarberá, Joaquín
Issue Date2011
PublisherTaylor & Francis
CitationLiquid Crystals 38(6): 679-688 (2011)
AbstractNovel 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 (Colh) 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.
Identifiersdoi: 10.1080/02678292.2011.568638
issn: 0267-8292
e-issn: 1366-5855
Appears in Collections:(ICMA) Artículos
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