A Pulsed NMR Study of Molecular Motions and Ordering Ethyl-[p-(p-methoxybenzylidene)-amino]-cinnamate

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Abstract
Pulsed nuclear magnetic resonance techniques were used to study the phase transitions in ethyl-[p-(p-methoxybenzylidene)-amino]-cinnamate from the room temperature solid phase through the isotropic liquid. Both the proton spin-lattice relaxation time an second moment were observed to change near each of the phase transitions. These quantities exhibited anisotropies in the semectic B phase similar to those observed for a typical nematic ordered in an electric field. The molecular order was stable in the smectic B phase, while molecular reordering was observed in the smectic A phase in the presence of moderate magnetic fields.