Observing molecular motions of a fluorinated ferroelectric liquid crystal using fluorine-19 NMR

Fluorine-19 NMR spectra have been recorded for both the phases (cholesteric and smectic C*) of the ferroelectric liquid crystal 2,3-difluoro-4-octyloxybiphenyl-4′(-4″-oxycarbonyl-(S)-1-chloro-3-methylbutyl)benzoate, using a conventional high-resolution NMR probe. The magnitude of the dipolar couplin...

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Veröffentlicht in:Liquid crystals Jg. 15; H. 2; S. 233 - 238
Hauptverfasser: Loubser, C., Wessels, P. L., Goodby, J. W., Styring, P.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Taylor & Francis Group 01.08.1993
ISSN:0267-8292, 1366-5855
Online-Zugang:Volltext
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Zusammenfassung:Fluorine-19 NMR spectra have been recorded for both the phases (cholesteric and smectic C*) of the ferroelectric liquid crystal 2,3-difluoro-4-octyloxybiphenyl-4′(-4″-oxycarbonyl-(S)-1-chloro-3-methylbutyl)benzoate, using a conventional high-resolution NMR probe. The magnitude of the dipolar coupling constant, D FF0 , was found to increase with decreasing temperature in the cholesteric phase with a sudden increase (of approximately 1 000 Hz) at the cholesteric-smectic C* transition, whereafter a more gradual change was observed. The order parameter, was S FF , subsequently calculated for each temperature.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678299308031953