HYPERSENSITIVITY IN COMPLEXES OF Nd(III) AND Ho(III) WITH MONOBASIC LIGANDS

Abstract Changes in the oscillator strengths of the hypersensitive f → f transitions of complexed Nd(III) and Ho(III) have been studied as a function of coordinating monobasic ligand in aqueous solution. For the transitions 4I9/2 → 4G5/2, 2G7/2 of Nd(III) and 5I8 → 5G6, 5F1 of Ho(III) a linear relation was found between the oscillator strength of the transition and the basicity of the ligand as measured by its acid constant. The utility of this correlation for gaining insight into some factors involved in the interaction of the ligand to the lanthanide cations and to protons is discussed.

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