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A caveat concerning ‘ultra-high-resolution nmr.’ effects of magnetic field induced alignment

✍ Scribed by E. W. Bastiaan; J. Bulthuis; C. MacLean

Publisher: John Wiley and Sons
Year: 1986
Tongue: English
Weight: 766 KB
Volume: 24
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260240819

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✦ Synopsis

Lme positions in high-resolution NMR spectra may be affected by dipolar couplings and anisotropic shift contributions, which arise from the partial orientation of the molecules by the magnetic field of the spectrometer. It is shown that, depending on the system studied, these effects can be larger than 0.01 Hz at moderate fields (ca 7 X lo4 G), and should therefore be considered when claiming accuracies of 10 mHz or better.

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Dipolar splittings with a quadratic dependence on static magnetic field strength are reported for selected pairs of nuclei in several porphyrins. These splittings are detectable as a result of a slight molecular alignment caused by the interaction of the static magnetic field with the anisotropic ma