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Abstract
In this paper we calculate the internal field constants γe of four homologs in the nematic and crystalline phase, and found that in the nematic phase the ye ∼ S2 curve isnearlya straight line for each compound. When oneextrapolates the straight line to S2 = 1 the corresponding γe value is nearly equal to γ∥, which is the crystalline internal field constant γ∥. The birefringence data for the four compounds:
(1) p(p-ethoxyphenylazo) phenyl valerate.
(2) p(p-ethoxyphenylazo) phenyl hexanoate,
(3) p(p-ethoxyphenylazo) phenyl heptanoate,
(4) p(p-ethoxyphenylazo) phenyl undecylenate,
were taken from those reported by Sornashekar el al.1