Heteronuclear second-order coupling effects in high-resolution Tin NMR spectra
β Scribed by Claude R Lassigne; E.J Wells; Louis J Farrugia; Brian R James
- Publisher
- Elsevier Science
- Year
- 1981
- Weight
- 152 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
## Abstract βUnexpectedβ secondβorder effects encountered in protonβcoupled ^13^C NMR spectra where relative proton shifts are large compared to protonβproton coupling constants are illustrated. The observed phenomenon is explained, with reference to the ABX spin system as a model, as being due to
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