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Abstract
Liquid crystalline properties of five series of biphenyl derivatives connected with p-nitrophenyl, phenyl, 2-naphthyl, 9-phenathryl and bromo as the terminal groups via flexible spacers were studied. All the compounds exhibited nematic phase. The nematic–isotropic or isotropic–nematic transition properties resulted in an odd–even effect as the length of the spacers was varied, in which the even members exhibited higher values, for the compounds with p-nitrophenyl, phenyl, 2-naphthyl and 9-phenanthryl groups, while the transitional properties of the compounds substituted with bromo atom as the terminal group instead of the aryl groups did not show such odd–even effect. These results suggest that the aryl rings, such as p-nitrophenyl, phenyl, 2-naphthyl and 9-phenanthryl groups, play a role of mesogen while the terminal bromo atom does not. The effect of the terminal aryl rings on the liquid crystalline properties will be reported.
Acknowledgements
The author thanks Akihiro Nishino, Shushi Furukawa, Kaoru Kubota, Mayumi Morimoto, Miho Sunose, Jun-ichi Inadome, Hisashi Tamura and Tomohide Uto for the preparation of series 1, 2, 3, 4 and 5.
Supplemental data
Supplemental data (the elemental analyses and spectral data of 2a-f, 3b-i, 4a-f and 5b-g,i) for this article can be accessed http://dx.doi.org/10.1080/02678292.2014.898343