Microscopic Study of the Molecular Motion of MHPOBC by ¹³C-NMR T₁ Relaxation Time

Abstract

In order to investigate the segmental motion of S-MHPOBC, we measured the ¹³C-NMR spin-lattice relaxation time (T₁), by means of the inversion recovery method. The temperature dependence of T₁ obey the Arrhenius type. T₁ for most of arbons show continuous temperature dependence. On the other hand , in case of the chiral carbon, temperature dependence of T₁ in SmA is different from that in SmC_A^*. This result suggests that the segmental motion of the chiral carbon changes under the influence of some kinds of molecular interaction changing at the phase transition.