Smectic, columnar and cubic mesophases in binary systems of hemiphasmidic and calamitic amphiphilic diols
A first example of an amphiphilic hemiphasmid consisting of a biphenyl rigid core connected to a hydrophilic 5,6-dihydroxy-3-oxahexyloxy group at one end and carrying two lipophilic dodecyloxy chains at the other end has been synthesized by a Pd-catalysed cross coupling reaction. The liquid crystall...
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| Published in: | Liquid crystals Vol. 25; no. 1; pp. 109 - 116 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Taylor & Francis Group
01.07.1998
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| ISSN: | 0267-8292, 1366-5855 |
| Online Access: | Get full text |
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| Summary: | A first example of an amphiphilic hemiphasmid consisting of a biphenyl rigid core connected to a hydrophilic 5,6-dihydroxy-3-oxahexyloxy group at one end and carrying two lipophilic dodecyloxy chains at the other end has been synthesized by a Pd-catalysed cross coupling reaction. The liquid crystalline properties of this compound have been investigated by polarized light microscopy, by differential scanning calorimetry and by X-ray diffraction. It exhibits a thermotropic hexagonal columnar mesophase which is stabilized on addition of formamide. On addition of ethylene glycol, a bicontinuous cubic mesophase is induced. Furthermore, binary mixtures of this compound with structurally related single chain amphiphiles have been investigated. Besides a smectic A phase, an induced columnar mesophase and a cubic phase were found in these mixtures. |
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| ISSN: | 0267-8292 1366-5855 |
| DOI: | 10.1080/026782998206551 |