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

M. Parra Corresponding author Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad de Concepción, Casilla 160‐C, Concepción, Chile

P. Hidalgo Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad de Concepción, Casilla 160‐C, Concepción, Chile

J. Alderete Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad de Concepción, Casilla 160‐C, Concepción, Chile

Pages 449-455 | Received 30 Sep 2004, Accepted 13 Dec 2004, Published online: 20 Feb 2007

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https://doi.org/10.1080/02678290500075142

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Abstract

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.

Acknowledgement

This work was supported by FONDECYT (Grant 1000521) and ‘Dirección de Investigación, Universidad de Concepción’.

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