New supramolecular liquid crystals induced by hydrogen bonding between pyridyl-1,2,4-oxadiazole derivatives and 2,5-thiophene dicarboxylic acid

Supramolecular liquid crystalline complexes were obtained from binary mixtures of 3-(4-pyridyl)-5-(4-n-alkoxy)phenyl-1,2,4-oxadiazoles and 2,5-thiophene dicarboxylic acid. Although the oxadiazole derivatives and the dicarboxylic acid are non-mesomorphic, the H-bonded complexes exhibit mesomorphism....

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Bibliographic Details
Published inLiquid crystals Vol. 32; no. 4; pp. 449 - 455
Main Authors Parra, M., Hidalgo, P., Alderete, J.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.04.2005
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Summary:Supramolecular liquid crystalline complexes were obtained from binary mixtures of 3-(4-pyridyl)-5-(4-n-alkoxy)phenyl-1,2,4-oxadiazoles and 2,5-thiophene dicarboxylic acid. Although the oxadiazole derivatives and the dicarboxylic acid are non-mesomorphic, the H-bonded complexes exhibit mesomorphism. Their liquid crystalline properties were investigated by differential scanning calorimetry and polarizing optical microscopy. The complexes exhibit enantiotropic nematic phases. A structural study involving AM1 semi-empirical calculations is also described.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290500075142