Proton Magnetic Resonance in Nematic Liquid Crystals — p‐Ethoxybenzal p‐Aminoazobenzene, Acetoxybenzal p‐Phenetidine, and p‐n‐Butoxybenzal p‐Phenetidine

Abstract

Wide line proton resonance spectra of three nematic liquid crystals — p‐Ethoxybenzal p‐Aminoazobenzene, Acetoxybenzal p‐Phenetidine, and p‐n‐Butoxybenzal p‐Phenetidine — were recorded. From the proton line separations and second moment analysis of the spectra, the degree of order “S” had been evaluated and compared. These results confirm that the acetoxy group protons (‐ OCOCH3) are hindered about the O ‐ C bond in the case of acetoxybenzal compounds.