✦ LIBER ✦

The Effect of Bulk Magnetic Susceptibility on Solid State NMR Spectra of Paramagnetic Compounds

✍ Scribed by Atsushi Kubo; Thomas P. Spaniol; Takehiko Terao

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 287 KB
Volume: 133
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1473

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✦ Synopsis

The effect of bulk magnetic susceptibility (BMS) on solid state NMR spectra of paramagnetic compounds was investigated theoretically and experimentally. The BMS shift was calculated for cylindrical and spherocylinderical containers with some ratios of the length L and the diameter D. The results show the best resolution can be obtained by using a long cylindrical sample container with L/D > 10 and by exciting only the region near the center of the container. The effect of the random orientations and distributions of crystallites in a powder sample was also calculated according to a model proposed by Schwerk et al. [J. Magn. Reson. A 119, 157 (1996)] with removing the Fermi contact term from their model. Static and the magic-angle spinning 13 C NMR spectra were recorded on two paramagnetic compounds of Ln(C 2 D 5 SO 4 ) 3 ⅐ 8H 2 O where Ln ‫؍‬ Pr, Yb. The modified theory predicts the BMS broadening of the experimental spectra very well.

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