Determination of order parameters from carbon–fluorine dipolar coupling
作者:
MatthewL. Magnuson,
LauraF. Tanner,
B.M. Fung,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 5
页码: 857-867
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408027856
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A convenient NMR method for the determination of the order parameters for liquid crystals containing a fluorinated phenyl ring is described. The technique consists of measuring the carbon-fluorine dipolar coupling constants in the one-dimensional C-13 spectrum of the molecule. The order parameters may then be calculated for the fluorine-containing ring with a high degree of precision because of the excellent resolution afforded by the 1-D C-13 spectra. The method is used to determine the core order parameters for 4-n-hexyloxybenzilidene-4′-fluoroaniline (FAB-OC6). The results of the carbon-fluorine dipolar coupling method are compared with two established methods for determining the core order parameters of phenyl rings, namely deuterium NMR spectroscopy and SLF/VAS, a two-dimensional C-13 NMR spectroscopy. Some comments about the orientational properties of the fluorinated liquid crystal FAB-OC6 are made.
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