Comparison of the dielectric and NMR results for liquid crystals: dynamic aspects1. (7th July 2014)

• Record Type: Journal Article
• Authors: Urban, Stanislaw; Geppi, Marco; Dong, Ronald Y.
• Is Part Of: Magnetic resonance in chemistry. Volume 52:Number 10(2014:Oct.)
• Page Start: 656
• Page End: 663
• Publication Date: 2014-07-07
• Subjects: Nuclear magnetic resonance spectroscopy -- Periodicals; Chemistry, Organic -- Periodicals; Magnetic resonance -- Periodicals; 538.36
• DOI: 10.1002/mrc.4100
• Languages: English
• ISSNs: 0749-1581

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 <italic>τ</italic>_DS in the case of DS, a tensor describing a nuclear interaction and the correlation time <italic>τ</italic>_NMR for NMR method. Furthermore, both methods provide correlation functions with different rank values. A common basis for the comparison between <italic>τ</italic>_DS and <italic>τ</italic>_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 &amp; Sons, Ltd.</p> </abstract>