Abstract
Absorption spectra of complexes between Eu 3+ and the dipicolinate (2,6-pyridinedicarboxylate) ligand are recorded for several metal-to-ligand ratios. The influence of complexation on the spectroscopic properties of Eu 3+ is studied. The complexation is reflected in the spectrum by an increase of the spectral intensities of the induced electric dipole transitions, by distinct crystal field fine structure of 2 S + 1 L J manifolds with small J quantum number and by a red shift of the absorption bands. The Judd-Ofelt intensity parameters Ω λ (λ = 2, 4, 6) are determined. Special attention is given to symmetry effects in the spectra. It is illustrated how the presence or absence of the 5 D 0 ← 7 F 0 transition provides information about the site symmetry of the Eu 3+ ion.
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