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- W2543393944 abstract "NMR spectra cannot normally be measured in solids in the same way in which they are routinely obtained from liquids. For example, the width of the 1 H NMR line in the spectrum of water is ~0.1 Hz, while the line from a static sample of ice is ~100 kHz wide. The reason for this is the existence of net anisotropic interactions which in the liquid are exactly averaged by the rapid thermal tumbling of molecules. A typical high-resolution spectrum of an organic compound in solution contains a wealth of information. The frequency of the radiation absorbed by the various non-equivalent nuclei in the molecule depends subtly on their chemical environments, giving rise to very sharp spectral lines. The parameters derived from such a spectrum (positions, widths, intensities and multiplicities of lines, relaxation mechanisms and rates) provide detailed information on the structure, conformation and molecular motion. This is not the case in a solid, where the nuclei are static and a conventional NMR spectrum is a broad hump which conceals most structural information. Although certain solids have sufficient molecular motion for NMR spectra to be obtainable without resorting to special techniques, we are concerned here with the general case, where there is no motion of nuclei and where conventional NMR, instead of sharp spectral lines, yields a broad hump which conceals information of interest to a chemist. Although the study of moments of such spectra and of various temperature-dependent parameters can still yield information on the degree of crystallinity, interatomic distances and molecular motion (‘wide-line NMR’), we shall be primarily interested in ways of achieving high-resolution spectra, i.e. spectra which enable magnetically non-equivalent nuclei of the same spin species (e.g. 13 C) to be resolved as individual lines." @default.
- W2543393944 created "2016-11-04" @default.
- W2543393944 creator A5072135471 @default.
- W2543393944 date "2017-01-01" @default.
- W2543393944 modified "2023-09-26" @default.
- W2543393944 title "NMR of Solids, Theory ☆" @default.
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- W2543393944 doi "https://doi.org/10.1016/b978-0-12-409547-2.12672-1" @default.
- W2543393944 hasPublicationYear "2017" @default.
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