We have studied molecular motions and the microscopic environment at the SmA-SmC (SmC*) transition in a racemic (chiral) smectic liquid crystal by means of 13C NMR with CP/MAS and without sample spinning. Fast overall fluctuation caused by the existence of the molecular chirality has been observed in the SmA phase by T 1 measurements. Static NMR spectra indicate that the conformation of the enantiomer in the SmC* phase is different from that of the corresponding racemic compound in the SmC phase.
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Yoshizawa et al. (1990) studied this question.
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