✦ LIBER ✦
Lanthanide induced paramagnetic shifts—derivation of equilibrium constants and absolute shifts in Eu(DPM)3 systems
✍ Scribed by R. K. Mackie; T. M. Shepherd
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 365 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Relationships between the magnitude of induced ^1^H NMR shifts and the equilibrium conditions in solutions containing lanthanide shift reagents are discussed and applied to the shifts induced in several organic molecules by Eu(DPM)~3~. Evidence that monoadduct formation is the predominant equilibrium in these solutions, and values of absolute shifts and equilibrium constants are reported. The results indicate that a contact mechanism makes the major contribution to the observed shifts in 4‐methylpyridine. In the case of 2,4,6‐trimethylpyridine the observed shifts are largely pseudocontact in origin.