Synthesis and properties of non-symmetric liquid crystal dimers containing a cholesteryl moiety |
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Authors: | Chunbo Zhang Longyi Jin Bingzhu Yin M Jamil Young-Jae Jeon |
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Institution: |
a Key Laboratory of Organism Functional Factors of the Changbai Mountain, Yanbian University, Ministry of Education, Yanji 133002, PR China
b Department of Chemistry, College of Science, Konkuk University, Seoul 143-701, South Korea |
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Abstract: | A series of non-symmetric liquid crystal dimers having cholesteryl and 4-trans-(4-n-alkylcyclohexyl)phenoxy groups were synthesized by condensation of cholesteryl ω-bromoalkanoates with appropriate 4-trans-(4-n-alkylcyclohexyl)phenols. The structures and thermal phase behaviour of the dimers were characterized using IR, 1H NMR and mass spectroscopy, elemental analysis, differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction measurements. Their thermal phase behaviour is significantly different to that of other cholesterol-based liquid crystal dimers. All of these liquid crystal dimers exhibit low phase transition temperatures. The relationships between their properties and chemical structures of these new dimers are discussed. |
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