Molecular Dynamics and Carbon-13Relaxation in the Nematic and Smectic A, C, and B Phases of 50.7

Abstract

Abstract The carbon-13 nuclear magnetic resonance spin-lattice relaxation times of the protonated ring carbonsof 4-n-pentyloxybenzylidene-4′-n-heptylaniline (50.7) have been measured in the nematic, smectic A, smectic C and smectic B phases. The results and theory presented in a recent deuterium magneticresonance study of 50.7-d 4 are used to calculate expected carbon-13 relaxation times, which are thencompared with our experimental values. The agreement is good enough to suggest that the moleculardynamics of the molecular core are reasonably well understood in the phases considered here.