Annual Reports on NMR Spectroscopy, Vol. 23 by G. A. Webb PDF

By G. A. Webb

ISBN-10: 0125053231

ISBN-13: 9780125053235

This ebook is a part of a chain on spectroscopy, and covers NMR reviews of remoted spin-pairs within the good nation, the oxidation country dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural platforms, strategies of macromolecules and aggregates and the NMR of coals and coal items. similar titlesare volumes 20, 21 and 22 within the sequence. summary: This booklet is a part of a sequence on spectroscopy, and covers NMR reviews of remoted spin-pairs within the strong nation, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural structures, ideas of macromolecules and aggregates and the NMR of coals and coal items. comparable titlesare volumes 20, 21 and 22 within the sequence

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Extra resources for Annual Reports on NMR Spectroscopy, Vol. 23

Sample text

These spectra have been used to derive bond lengths and orientational information for amino acids and peptides. 005 A from the effect of 13C-170 dipolar coupling on the "0 NMR spectrum. ' 6o Spin pairs in inorganic compounds have also been studied.

69Analysis of the dipolar splittings as a function of crystal orientation indicated that the dipolar coupling was nonaxially symmetric. 5" was responsible. 5'. A metal dihydrogen complex, (q2-H,)W(CO)3(PCy3)2(Cy = cyclohexyl), using 'H NMR spectroscopy. 01 A. The internuclear vector between the protons was found to undergo an in-plane torsion of about 16'. The effect of this torsion was clearly evident in the 'H powder NMR line shape, given in Fig. 11 with the molecular structure for this class of compounds.

64 The 'H-'H spin pair in carboxylic acid dimers has been a popular choice of investigators. For example, p-toluic acid (I),65malonic acid (11)66 and tetrafluoroterephthalic acid (111)67have been studied, at least in part, in terms 5' b~ I II o" c OH \- Ill of the 'H-'H dipolar coupling between the two acidic protons. e. all protons with the exception of the acidic protons were replaced by deuterium). At low temperature (26 K), one of the two tautomers of the dimer was frozen out. 33 A, from which the static dimer structure, illustrated in Fig.

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Annual Reports on NMR Spectroscopy, Vol. 23 by G. A. Webb


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