Abstract
In this chapter, applications of new NMR techniques to the study of liquid crystals are described in a cursory way. Two-dimensional (2D) 13C NMR of liquid crystals was mentioned at the end of Chapter 3. The carbon-proton dipolar couplings were determined by combining near magic-angle spinning of the sample and the separated local field spectroscopy [9.1]. A 2D 19F spin echo experiment on a sample rotating near the magic-angle has also been reported [9.2]. The sample contains a chiral solute dissolved in a liquid crystal. Deuteron NMR is by far the most extensively used probe of internal motion and molecular ordering in liquid crystals. One common problem encountered in 2H NMR of liquid crystals is the assignment of deuterium resonances. This can be overcome by synthesis of singly labeled compounds, but this is often time-consuming and expensive. The assignment problem is even more difficult when two deuterated chains are present in a mesogen. The deuterium 2D autocorrelation experiment [9.3] can be used to assign the deuteron signals of perdeuterated liquid crystals. Deuteron 2D exchange spectroscopy [9.4, 9.5] has been used to study slow motions in glass-forming discotic liquid crystals [9.6, 9.7] and in liquid-crystalline side group polymers [9.8]. Some of these 2D NMR experiments on liquid crystals will be surveyed in Section 9.1.
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Dong, R.Y. (1994). Multiple-Quantum and Two-Dimensional NMR. In: Nuclear Magnetic Resonance of Liquid Crystals. Partially Ordered Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4684-0208-7_9
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