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Comparison of the dielectric and NMR results for liquid crystals: dynamic aspects
Author(s) -
Urban Stanislaw,
Geppi Marco
Publication year - 2014
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4100
Subject(s) - chemistry , nuclear magnetic resonance spectroscopy , relaxation (psychology) , two dimensional nuclear magnetic resonance spectroscopy , nuclear magnetic resonance , transverse relaxation optimized spectroscopy , molecular dynamics , polarization (electrochemistry) , nmr spectra database , liquid crystal , dielectric , tensor (intrinsic definition) , analytical chemistry (journal) , fluorine 19 nmr , spectral line , computational chemistry , condensed matter physics , organic chemistry , stereochemistry , physics , mathematics , optoelectronics , astronomy , pure mathematics , psychology , social psychology
Critical analysis of the results of studies of molecular rotational dynamics in liquid crystalline substances with the aid of the dielectric spectroscopy (DS) and nuclear magnetic resonance (NMR) is given. Both methods are known to be sensitive to different aspects of molecular rotations: the polarization vector and the relaxation time τ DS in the case of DS, a tensor describing a nuclear interaction and the correlation time τ NMR for NMR method. Furthermore, both methods provide correlation functions with different rank values. A common basis for the comparison between τ DS and τ NMR is postulated. Several examples of the temperature dependence of the correlation times coming from the two spectroscopic methods are presented. Qualitative agreements of the correlation times were achieved in most cases. Copyright © 2014 John Wiley & Sons, Ltd.