Order Parameters of α-Substituted Anthraquinone Dyes in a Nematic Liquid Crystalline Host

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Abstract
A study is presented of the optical order parameters and spectroscopic properties of α-substituted anthraquinone dyes in a nematic liquid crystalline mixture composed of cyanophenylcyclohexane derivatives. Then, the results of this study are discussed in terms of the effects of the dye structure on the order parameters. From the systematic variation in structure, the order parameters are found to be improved when a biphenylamino group is introduced into the α-position of the anthraquinone nucleus. In addition, preliminary data on the solubility and photostability of the dyes are reported.