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The order parameter (S) of a number of Schiff base azo compounds having the structure where Ar = 4-cyanophenyl, 4-nitrophenyl, 5-chlorothienyl, or2-pyridyl; Y = hydrogen, methyl, or methoxy; R = methyl, ethyl, n-butyl, or n-hexyl; NR2 = N-pyrrolidinyl have been determined in two different nematic liquid crystalline hosts both of which have a positive dielectric anisotropy. The results are discussed in terms of the effects of the dye structure on the order parameter.
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HUNG et al. (1980) studied this question.
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