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Pleochroic anthraquinone dyes have been prepared with order parameters of up to 0.70 when dissolved in liquid crystals. Over 100 dyes have been synthesised, in which a variety of substituents have been incorporated into the 1,4, and 5 positions on the anthraquinone nucleus, affording red, purple, blue and green dyes. Several dyes showed significantly higher stability than most other high order parameter azo-dyes. Some dyes showed solubility and order parameter sufficiently high to allow their employment in liquid crystal displays.
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Pellatt et al. (1980) studied this question.
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