Columnar liquid crystals based on amino-1,3,4-thiadiazole derivatives |
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Authors: | ML Parra EY Elgueta JA Ulloa JM Vergara AI Sanchez |
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Institution: | 1. Facultad de Ciencias Químicas, Departamento de Química Orgánica , Universidad de Concepción , Concepción , Chile mparra@udec.cl;3. Facultad de Ciencias Químicas, Departamento de Química Orgánica , Universidad de Concepción , Concepción , Chile |
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Abstract: | Novel liquid crystal materials base on amino-thiadiazoles, specifically 5-(3,4-di-, and/or 3,4,5-tri-n-alkoxy)phenyl-2-amino-1,3,4-thiadiazoles (3a–f, n?=?10, 12, 14) and 5-(3,4-di- and/or 3,4,5-tri-n-alkoxy)phenyl-2-(4-amino)phenyl-1,3,4-thiadiazoles (6a–f, n?=?10, 12, 14) were synthesised. The mesomorphic properties of these compounds were studied by differential scanning calorimetry and polarising optical microscopy. All the compounds in series 3a–f and series 6a–f display an enantiotropic columnar phase. The mesomorphic properties were found to be dependent on the number of the side alkoxy chains, and on the length of the rigid core, and on the position of the thiadiazole ring. The best results were obtained with compounds of series 3a–f. |
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Keywords: | amino-thiadiazoles columnar phase mesomorphism liquid crystals |
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