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

By G. A. Webb

This e-book is a part of a sequence on spectroscopy, and covers NMR experiences of remoted spin-pairs within the stable kingdom, 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 ebook is a part of a chain on spectroscopy, and covers NMR reviews of remoted spin-pairs within the reliable kingdom, the oxidation country dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin leisure in natural platforms, options 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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Thus a plot of A vs. D was linear; extrapolation to D = 0 indicated A. 42 %, after correcting the measured A. P. E. 83Note that the Carr-Purcell sequence suppresses the chemical-shift anisotropy broadening. 87 As the spin-echo amplitude is sensitive to homonuclear 13C-13C dipolar coupling, it can be used to determine the separation between the carbon nuclei on a metal surface. 85 The homonuclear 3C-1 dipolar coupling provided a probe of the surface density of the C O layer on the metal particles.

Crystalline trans-azobenzene contains two crystallographically nonequivalent molecules in the unit cell; however, the "N MAS spectrum of this compound indicated only one resonance with a half-width of less than 20 Hz (1 ppm). Close inspection of the static powder pattern (Fig. e. the identical value of di,, was fortuitous. Analysis indicated a large 15N chemical shift anisotropy of 925 and 880ppm for the two sites, much larger than that observed for 15N,. The slightly smaller value of A~Jat one site was attributed to the disorder reported for one site in the crystal structure.

Gl and rISwere not coincident. This theory was subsequently applied to 19F and 31P NMR powder spectra of BaFP03,'27 obtained at different field strengths, and provided information on the sign of ' J ( 19F,3 1 P), the chemical-shift anisotropy for each nucleus and the F - P bond length. A moment analysis of the 19F NMR spectrum yielded a 19Fchemical-shift anisotropy of 182 & 22 ppm, and also indicated substantial intermolecular 19F- 19F dipolar broadening. 035 A. The sign of 'J(19F,31P)was unambiguously determined to be negative by its influence on the 31PNMR line shape.

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