Molecular Dynamics in Smectic and Crystalline Phases Studied by ^sup 13^C-NMR Spin Lattice Relaxation Time Observation

The temperature dependence of the spin-lattice relaxation time T... is investigated in the chiral smectic liquid crystal (S)-4-(1-methylhexyloxycarbonyl)phenyl 4'- octyloxybiphenyl-4-carboxylate (S-MH(6)POBC) by solid-state ...C-NMR spectroscopy. The T... of an aromatic carbon belonging to the...

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Bibliographic Details
Published in:Ferroelectrics 2010-01, Vol.394 (1), p.16
Main Authors: Komiya, Ken-Ichiro, Nanamiya, Masato, Oshima, Masato, Hiraoka, Kazuyuki
Format: Article
Language:English
Subjects:
Crystal lattices
Crystal structure
Ferroelectrics
Molecules
Phase transitions
Spectrum analysis
Temperature effects
Online Access:Get full text
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Summary:The temperature dependence of the spin-lattice relaxation time T... is investigated in the chiral smectic liquid crystal (S)-4-(1-methylhexyloxycarbonyl)phenyl 4'- octyloxybiphenyl-4-carboxylate (S-MH(6)POBC) by solid-state ...C-NMR spectroscopy. The T... of an aromatic carbon belonging to the core part of the liquid-crystalline molecule decreases from 1 s to 0.2 s with decreasing temperature in smectic phases, where the frequency of the molecular rotation around its long axis is higher than the Larmor frequency of 100 MHz in the present study. Because the molecular rotation freezes during the phase transformation from the smectic phase to the crystalline phase, T... rapidly increases from 0.2 s to 16 s. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0015-0193
1563-5112