By G. A. Webb
This publication is a part of a sequence on spectroscopy, and covers NMR reviews of remoted spin-pairs within the stable nation, the oxidation country dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural structures, options of macromolecules and aggregates and the NMR of coals and coal items. comparable titlesare volumes 20, 21 and 22 within the sequence. summary: This booklet is a part of a chain on spectroscopy, and covers NMR reviews of remoted spin-pairs within the sturdy nation, the oxidation kingdom dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest 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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Extra info for Annual Reports on NMR Spectroscopy, Vol. 23
E. WASYLISHEN 105' -- Fig. 12. 9 MHz. 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.
The structure of p-toluic acid dimer at 26K, determined from the 'H-'H dipolar coupling. Distances indicated are in A. 8 kJmol-'. Single-crystal 'H NMR spectra of malonic acid (11) were obtained by Schuff and Haeberlen66 using a two-dimensional technique similar to that used for trichloroacetic acid6' with two important differences. First, Fourier transformation was applied to both time dimensions. This necessitated the second difference, a modified MREV-8 decoupling sequence to allow quadrature sensitivity in o1by preserving the t , phase information at t , = 0.
034 A) from an X-ray diffraction study. The authors attributed this discrepancy to anisotropy in the indirect coupling, - 920 Hz or + 10 280 Hz. The 31Pchemical-shift anisotropy was large, 1239 ppm; the extremely high frequency value of 6, was ascribed to the low-lying n + n* transition in this compound. The principal components of the chemical-shift tensor were found to be oriented such that 6,, was perpendicular to the molecular plane and a, was approximately along the phosphorus lone pair. Eckert and coworker^^^,^^ have used ,'P NMR to characterize the phosphorus sites in various phosphorus chalcogenide compounds.