This paper reports the refractive index and density data and discusses the orientational order parameters in the case of the following eight nematic compounds, viz., (1)p(p-ethoxyphenylazo) phenyl valerate, (2) p(p-ethoxyphenylazo)phenyl hexanoate, (3) p(p-ethoxyphenylazo)phenyl heptanoate, (4) p(p-ethoxyphenylazo)phenyl undecylenate, (5) 4,4′-bis(hexyloxy)azoxybenzene, (6) 4,4′-bis(heptyloxy)azoxybenzene, (7) anisylidene-p-aminophenyl acetate, and (8) anisylidene-p-aminophenyl butyrate.
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Somashekar et al. (1978) studied this question.