Liquid crystal properties of some substituted pyrazines |
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| Authors: | J. W. Brown D. T. Hurst J. P. O'donovan D. Coates J. D. Bunning |
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| Affiliation: | a Faculty of Science, Kingston University, Surrey, Englandb Merck Ltd., Poole, Dorset, Englandc Sheffield Hallam University, Materials Research Institute, Sheffield, England |
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| Abstract: | A number of biphenyl, terphenyl analogues and ethynes which contain a pyrazine ring have been made and their liquid crystal transition temperatures, together with examples of birefringence measurements, are reported. All the 2,5-disubstituted pyrazine systems are liquid crystalline showing high birefringence values for the biphenyl and terphenyl analogues, whereas the 1,5-disubstituted systems are not liquid crystalline. The pyrazine ethyne systems exhibit very high birefringence values. X-ray diffraction has been used to identify the liquid crystal phases of 2-n-nonyloxy-5-(4'-propylbiphenyl-4-yl)pyrazine. |
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