Abstract
Proton NMR experiment was carried out on a pure re-entrant nematic liquid crystal OBBC in nematic ( N), smectic A( S A ), and re-entrant nematic ( RN) phases. The re-entrant phase transition was detected by measuring the rotation pattern (θ 0-dependence) of the spectra in the external field. The dipolar splitting at θ 0=0 showed smooth temperature-dependence through the phase changes, RN− S A − N. Orientational order of the molecular core is thus hardly affected by the formation of 1-D density modulation. The temperature-dependence of the spin-lattice relaxation rate showed that translational self-diffusion is the predominant mechanism of relaxation in RN, but the director fluctuation is quite significant in N.
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