Visualization of enantiomers through deuterium NMR in cholesterics. Optimization of the chiral liquid crystal solvent
作者:
I. Canet,
J. Løvschall,
J. Courtieu,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 3
页码: 405-412
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408029165
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Thermotropic cholesteric liquid crystals made of mixtures of cholesteric esters and of a Δχ <0 nematic (ZLI2806) may be used as NMR solvents to visualize enantiomers. Proton decoupled deuterium NMR spectra of a racemic mixture show that the quality of the spectra strongly depends on the temperature and on the nature and the concentration of the ester. A relationship between the spectral resolution and the presence of textural defects in the mesophase is also discussed. The best results, both for spectral resolution and enantiomeric separation, were obtained with a 45/55 by weight mixture of cholesteryl butyrate and ZLI2806 at 368 K.
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