Anthraquinone-Based Dichroic Dyes for Achromatic Black Guest-host Liquid Crystal Display

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Abstract
The properties of three different classes of 2,3-substituted 1,4-diaminoanthraquinone dichroic greenish blue dyes with a maximum absorption peak in the long wavelength region from 660 nm up to 760 nm, which are useful as a guest dye in an achromatic black guest-host liquid crystal display, have been investigated. 1,4-Diaminoanthraquinone-(N-substituted-3-imino)-2,3-dicarboximidines (I) and 1,4-diaminoanthraquinone-(N-substituted-3-thioxo)-2,3-dicarboximidines (II) exhibit higher dichroic ratios and higher solubilities and moreover the latter class (II) shows a maximum absorption peak at a much longer wavelength, compared to 1,4-diaminoanthraquinone-(N-substituted)-2,3-dicarboximides (III). The order of various properties in the three classes of dyes are as follows: II > I > III for dichroic ratio, II > I > III for solubility, and II > III > I for maximum absorption wavelength, respectively.

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