A spectroscopic study of lanthanide(III) acetate and haloacetates through the correlation of phenomenological intensity parameters and lanthanide induced NMR chemical shifts
作者:D.F. Mullica、G.A. Wilson
DOI:10.1016/s0020-1693(00)85978-2
日期:1990.11
A series of lanthanide acetate and haloacetate complexes were studied by absorbance spectroscopy and H-1, C-13 and O-17 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 Pr3+, Nd3+, Ho3+ and Er3+ is observed. Also, a linear relationship is observed relating the change in the hypersensitive indicator parameter, OMEGA-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.