Fluorine-containing negative dichroic 1,4-bis(acylamino)anthraquinone dyes

Fluorine-containing negative dichroic 1,4-bis(acylamino)anthraquinone dyes have been synthesized. The solubility of the dyes based on the acyl moieties in chloroform was in the order of hexanoyl>4-butylbenzoyl>3,5,6-trichloro-octafluorohexanoyl>perfluoroalkanoyl, 4-(perfluorobutyl)benzoyl, pentafluorobenzoyl, and benzoyl. The negative dichroism of the dyes was greater as the l / d ratio increased and the theta value was closer to 90 . Only some 3,5,6-trichloro-octafluorohexanoyl derivatives were sufficiently soluble. Their S values were -0.26 to -0.29 in ZLI-4792.