Dielectric relaxation studies in N-(4-octyloxy-2-hydroxybenzylidene)-4-carbethoxyaniline

Temperature dependent dielectric spectroscopy of a newly synthesized compound N-(4-octyloxy-2-hydroxy-benzylidene)-4-carbethoxyaniline, having a wide temperature range (similar to70degreesC) Smectic A (SmA) phase has been carried out in the frequency range 100 Hz-10 MHz. Dielectric permittivity and loss in the homeotropic (epsilon'(parallel to) and epsilon"(parallel to)) and planar (epsilon'(perpendicular to) and epsilon"(perpendicular to)) alignments of the molecules have been determined. Relaxation frequencies corresponding to the rotation of the molecules about their short axes have been found to lie below 1 MHz and exhibit Arrhenius behaviour. Relaxation frequencies corresponding to the rotation of the molecules about their long axes are expected to lie above 10 MHz. Dielectric anisotropy (Deltaepsilon' = epsilon'(parallel to) - epsilon'(perpendicular to)) has been found to be negative throughout the range of the SmA phase.