Abstract
A series of lanthanide acetate and haloacetate complexes were studied by absorbance spectroscopy and 1H, 13C and 17O NMR in order to determine bonding effects through a correlation of phenomenological intensity parameters with contact shift contributions and calculated polarizabilities of the ligands. A correlation between the ligand polarizability and the oscillator strengths of the hypersensitive transitions for the acetate and haloacetates of Pr 3+, Nd 3+, Ho 3+ and Er 3+ is observed. Also, a linear relationship is observed relating the change in the hypersensitive indicator parameter, Ω 2, to the relative spin density of the nuclei within the ligand having close contact with the lanthanide ion. Such correlations demonstrate a direct relationship between hypersensitive pseudoquadrupole transitions and contact shifts in lanthanide Complexes.
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