Proton Magnetic Resonance Lines in Liquid Crystalline 4,4′-Dipropoxyazoxybenzene, 4,4′-Dibutoxyazoxybenzene, and Diethyl 4,4′-Azoxydibenzoate

Abstract

Experimental linewidth (2.3 to 3.1 G) vs temperature measurements are given for the broad triplet nuclear magnetic resonance lines of the nematic phases of 4,4′-dipropoxyazoxybenzene and 4,4′-dibutoxyazoxybenzene, along with a broad doublet line of the latter as it cools down to the solid state. Also observed was a 4.2-G triplet line for the smectic liquid crystal diethyl 4,4′-azoxydibenzoate. It is the first time that a triplet line has been observed for any smectic liquid crystal.