NMR of solutes in nematic and smectic A liquid crystals: the anisotropic intermolecular potential

Orientational order parameters determined from 1H NMR spectroscopy of solutes in liquid crystals that form both nematic and smectic A phases are used to determine the solute smectic A order parameters and the smectic–nematic coupling term. For the analysis, it is necessary to know the nematic part o...

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Bibliographic Details
Published in:Magnetic resonance in chemistry 2014-10, Vol.52 (10), p.570-580
Main Authors: Burnell, E. Elliott, Dong, Ronald Y., C. J. Weber, Adrian, Yethiraj, Anand
Format: Article
Language:English
Subjects:
anisotropic
Anisotropy
Couplings
Extrapolation
intermolecular potential
liquid crystal
Liquid crystals
Nematic
NMR
NMR spectroscopy
order parameter
Order parameters
Phases
smectic
solute
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Summary:Orientational order parameters determined from 1H NMR spectroscopy of solutes in liquid crystals that form both nematic and smectic A phases are used to determine the solute smectic A order parameters and the smectic–nematic coupling term. For the analysis, it is necessary to know the nematic part of the potential in the smectic A phase: various ways of extrapolating parameters from the nematic phase to the smectic phase are explored. Copyright © 2014 John Wiley & Sons, Ltd. This mini‐review aims to give a survey of solute studies in the past decade in our laboratory to assess the smectic mean‐field potential. Given that the solutes' proton dipolar couplings cannot be directly related to this anisotropic potential and a lack of the knowledge of the nematic potential in the smectic A phase, various ways of interpolating or extrapolating the mean field from the nematic phase(s) into the smectic A phase are tested.
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.4113