Banana-shaped mesogens: effect of lateral substituents on seven-ring esters containing a biphenyl moiety |
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Authors: | H N Shreenivasa Murthy B K Sadashiva |
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Institution: | Department of Advanced Materials Engineering for Information and Electronics , Kyung Hee University , Yongin , South Korea |
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Abstract: | The synthesis and characterization of five homologous series of symmetrical compounds composed of banana-shaped molecules containing a biphenyl moiety are reported. All these compounds are non-Schiff's bases and are esters. The effects of lateral substituents such as fluoro, methyl and ethyl in the side arms of these molecules are examined. These substituents have a strong influence in reducing the clearing temperatures. Banana phases such as B1, B2 and B6 were observed in the above series of compounds. The mesophases were characterized by a combination of polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction and electro-optic studies. |
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Keywords: | three-dimensional active retarder twisted nematic mode compensation film |
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