The mesomorphic behaviour of cyanopropylalkyldimethylammonium bromides |
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Authors: | M Arkas K Yannakopoulou C M Paleos P Weber A Skoulios |
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Institution: | 1. NRC ‘Demokritos’, 15310 Aghia Paraskevi , Attiki, Greece;2. Groupes des Matériaux Organiques, Institut de Physique et Chimie des Materiaux, UMR 0046 (CNRS-ULP-EHICS) , 23, rue du Loess, 67037, Strasbourg Cedex, France |
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Abstract: | Abstract A homologous series of N-cyanopropyl-N-alkyl-N,N-dimethylammonium bromides was synthesized and characterized. Its thermotropic liquid crystalline behaviour was studied by differential scanning calorimetry, polarizing optical microscopy, dilatometry, and X-ray diffraction. A smectic A mesophase was thus identified. The smectic layers were found to be formed of two ionic planes alternately separated by sub-layers of disordered alkyl chains and cyanopropyl groups. The smectic structure was compared with that of the crystal at room temperature and also that of the smectic T structure of the N,N-dialkyl-N,N-dimethylammonium bromides already described in the literature. |
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