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ABSTRACT
We studied the molecular dynamics of chiral and achiral smectic liquid crystals by solid-state 13C nuclear magnetic resonance (13C-NMR) spectroscopy with a Larmor frequency of 100 MHz. The chiral and achiral smectic liquid crystals used were S-4-(1-methylhexyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate and 4-(hexyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate, respectively. The peak width and the spin-lattice relaxation time were measured to investigate the effect of chirality on the molecular dynamics. The 13C-NMR study revealed that introducing chirality, namely, the introduction of a (-CH3) group to the C23 carbon, affects the intramolecular correlation between the mobility of the carbon and the rotational motion of the aromatic core.
Funding
This work was supported by a Grant-in-Aid for Scientific Research C (25410214) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT).