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- W119180568 abstract "In this chapter, applications of newer 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 have been determined by combining near magic-angle spinning of the sample and the separated local field spectroscopy [9.1], while carbon-carbon dipolar couplings have been obtained in nonlabeled liquid crystals using double-quantum coherences to filter out the desired 13C NMR signals. 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. 2D NMR using the quadrupole echo (QE) spectroscopy [9.3]and double-quantum spin-echo spectroscopy [9.4]is described in Section 9.1. The QE pulse sequence is used to produced a time-domain signal s(t 1,t 2). 2D Fourier transforming this signal produces a 2D spectrum s(E1, E2 ) which can separate chemical shift and quadrupolar splitting [9.5]. 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 auto-correlation experiment [9.6]using the QE sequence can be used to assign the deuteron signals of perdeuterated liquid crystals. Multipulse QE sequences [9.7]can also be used to generate a 2D spectrum in which the ordinary QE spectrum is a slice along E1 = 0 and each peak in the E1 dimension has a Lorentzian line shape [9.8]whose width can be used to find its transverse spin relaxation time T 2. Deuteron 2D exchange spectroscopy [9.9, 9.10]has been used to study slow motions in glass-forming discotic liquid crystals [9.11, 9.12]and in liquid-crystalline side group polymers [9.13]. Some of these 2D NMR experiments on liquid crystals will be surveyed in Section 9.1." @default.
- W119180568 created "2016-06-24" @default.
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- W119180568 date "1997-01-01" @default.
- W119180568 modified "2023-09-23" @default.
- W119180568 title "Multiple-Quantum and Two-Dimensional NMR" @default.
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- W119180568 doi "https://doi.org/10.1007/978-1-4612-1954-5_9" @default.
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