Natural Abundance 2H NMR for Liquid Crystal Studies. Application to 4‘-(Hexyloxy)-4-cyanobiphenyl
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Abstract
Quadrupolar splitting in deuterium NMR (2H NMR) is a powerful means to evaluate microscopic orientational orders of liquid crystals. So far, because of the low sensitivity of 2H NMR at natural abundance, application of 2H NMR to liquid crystals has been considered possible only for samples with deuterium enrichment. However, in the present work, we show that by taking advantage of the high sensitivity of a recent high-field NMR spectrometer, detection of 2H NMR signals at the natural abundance of the 2H isotope is possible under proton decoupling. Assignments of the 2H NMR signals to specific chemical groups in the molecule may be made by comparing 2H chemical shift in the liquid crystalline phase with those of 1H chemical shift in the isotropic phase. Subsequent evaluation of quadrupolar splittings gives microscopic orientational orders of the molecule. With this technique, temperature dependence of microscopic orders of 4‘-(hexyloxy)-4-cyanobiphenyl is demonstrated.
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