The N,N'-bis[4-(4-n-alkyloxybenzoyloxy)benzylidene]phenylene-1,3-diamines: mesophase behaviour and physical properties |
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| Authors: | W Weissflog I Wirth S Diele G Pelzl H Schmalfuss T Schoss |
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| Institution: | 1. Institut für Physikalische Chemie, Martin-Luther-Universit?t Halle-Wittenberg, Mühlpforte 1, D-06108 Halle, Germany;2. Institut für Physikalische Chemie, Martin-Luther-Universita t Halle-Wittenberg, Mühlpforte 1, D-06108 Halle, Germany;3. Physikalische Chemie II, Ruhr-Universit?t, Universit?tsstrasse 151, D-44780 Bochum, Germany |
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| Abstract: | A homologous series of banana-shaped compounds (n =1-12) is described. The short-chain derivatives exhibit a B6 phase, while B6/B1 dimorphism is found for the pentyloxy and hexyloxy homologues. The B1 phase of the compounds having longer alkyloxy chains is changed to a B2 phase for the compounds with n =11 and 12. The phase characterization was performed using their optical textures and by means of X-ray investigations. Transition enthalpies were measured using DSC. In addition, density measurements were performed on one selected homologue. The compound n =8 exhibiting a B1 phase was investigated also by high-pressure DTA. |
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