Synthesis and mesomorphic properties of three-benzene-ring-containing banana-shaped liquid crystals |
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Authors: | Yuan Ming Huang Qing-Lan Ma |
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Affiliation: | 1. College of Physics &2. Electronic Information, Yunnan Normal University , Yunnan, China dongshanisland@126.com;4. Electronic Information, Yunnan Normal University , Yunnan, China |
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Abstract: | A homologous series of three-benzene-ring-containing banana-shaped compounds, N,N-bis(4-alkylcarbonyloxybenzylidene)benzene-1,3-diamine, were synthesised by esterifying aliphatic acids with the three-benzene-ring bent core 1,3-phenylene-bis(4-hydroxybenzylideneamine). As the number of carbon atoms in the aliphatic acids increased from 1 to 12, 12 novel banana-shaped compounds resulted with increasing lengths in their terminal tails. The mesomorphic properties of this homologous series of three-benzene-ring-containing banana-shaped compounds were characterised by means of polarised optical microscopy, differential scanning calorimetry, X-ray diffraction and electro-optical studies. Our results have demonstrated that this series of banana-shaped compounds can form mesophases, although each of their bent cores contains only three benzene rings. |
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Keywords: | banana-shaped liquid crystal three-benzene-ring bent core mesophase phase transition temperature |
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