In order to investigate the segmental motion of S-MHPOBC, we measured the
13C-NMR spin-lattice relaxation time (T
1), by means of the inversion recovery method. The temperature dependence of T
1 obey the Arrhenius type. T
1 for most of arbons show continuous temperature dependence. On the other hand , in case of the chiral carbon, temperature dependence of T
1 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.
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