Symmetric esters derived from 1,3,4-oxadiazole: synthesis, mesomorphic properties and structural study by semi-empirical calculations |
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Authors: | M. Parra J. Alderete C. Zú iga P. Hidalgo J. Vergara G. Fuentes |
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Affiliation: | M. Parra ,J. Alderete,C. Zú,ñ,iga,P. Hidalgo,J. Vergara,G. Fuentes |
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Abstract: | Three homologous series of symmetric esters derived from 2-alkylthio-5-( p -hydroxy)phenyl-1,3,4-oxadiazole (series 3 , 4 and 5 ) were synthesized and their liquid crystalline properties investigated by optical microscopy and differential scanning calorimetry. Depending on the chain length, nematic and smectic C phases were observed in the series 3 ; smectic A and smectic C phases in series 4 . None of the homologues of series 5 shows mesomorphic properties. These three series are compared with other previously reported oxadiazoles. A structural study of AM1 semi-empirical calculations is also described. |
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