Download e-book for iPad: Annual Reports on NMR Spectroscopy, Vol. 23 by G. A. Webb

By G. A. Webb

ISBN-10: 0125053231

ISBN-13: 9780125053235

This booklet is a part of a chain on spectroscopy, and covers NMR reports of remoted spin-pairs within the stable country, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin leisure in natural structures, recommendations of macromolecules and aggregates and the NMR of coals and coal items. comparable titlesare volumes 20, 21 and 22 within the sequence. summary: This e-book is a part of a sequence on spectroscopy, and covers NMR reviews of remoted spin-pairs within the sturdy kingdom, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural structures, suggestions of macromolecules and aggregates and the NMR of coals and coal items. similar titlesare volumes 20, 21 and 22 within the sequence

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In their experiment, a DANTE pulse sequence was applied at a particular 13C resonance frequency in order to invert it selectively. By introducing a "diffusion delay", connectivities to other 13C sites could be detected by observing enhanced intensities for particular signals in the difference spectra which combined the results of experiments with and without the DANTE sequence. This technique was illustrated using [1,2- 3C2]glycine samples. Application to natural-abundance samples has not yet been demonst rated and may require higher sensitivity.

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.

Rotation of the crystal is about the crystallographic a axis, which lies perpendicular to B,. The extra lines apparent at the centre of the splittings are due to natural abundance I3C nuclei that are not bonded to another I3C. (Reproduced with permission from van Willigen et aL3') NMR STUDIES OF ISOLATED SPIN PAIRS IN THE SOLID STATE 21 longer than diffraction or microwave results. These discrepancies were probably due to inadequacies in the model used to correct for librational averaging of the dipolar interaction.

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


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