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Structural study of smectic A phases in homologous series of N-alkylpyridinium alkylsulphates |
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| Authors: | C. Cruz B. Heinrich A. C. Ribeiro D. W. Bruce D. Guillon |
| Affiliation: | 1. CFMC-UL, Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal and IST-UTL, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom;3. CFMC-UL, Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal and IST-UTL, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;4. IPCMS-GMO, 23 rue du Loess, BP 20CR, F-67037 Strasbourg Cedex, France;5. IPCMS-GMO, 23 rue du Loess, BP 20CR, F-67037 Strasbourg Cedex, France |
| Abstract: | The mesomorphic properties of 27 homologues of the N-alkylpyridinium alkylsulphate series were studied by X-ray diffraction and dilatometry. All of these compounds exhibit single smectic A phases whose layer spacings are between 0.64 and 0.8 times the molecular length. Polarizing optical microscopy observation shows that these peculiar layer spacings are not due to the tilting of the molecules; a new packing model is proposed to explain the particular structure of these thermotropic ionic liquid crystal phases. |
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