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Lanthanide induced paramagnetic shifts—derivation of equilibrium constants and absolute shifts in Eu(DPM) 3 systems
Author(s) -
Mackie R. K.,
Shepherd T. M.
Publication year - 1972
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270040416
Subject(s) - lanthanide , chemistry , equilibrium constant , paramagnetism , chemical shift , molecule , dynamic equilibrium , reagent , computational chemistry , thermodynamics , organic chemistry , physics , condensed matter physics , ion
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.