Author:

Keywords:

lanthanides, rare earths, europium, Eu3+, spectroscopy, Judd-Ofelt theory, hypersensitivity, Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, EMPIRICAL INTENSITY PARAMETERS, 4F->4F ABSORPTION-SPECTRA, AQUEOUS-SOLUTION, 9-COORDINATE NEODYMIUM(III), HOLMIUM(III) COMPLEXES, CHIRAL DISCRIMINATION, ERBIUM(III) COMPLEXES, ENERGY-LEVELS, LUMINESCENCE, CRYSTAL, 02 Physical Sciences, 03 Chemical Sciences, 10 Technology, Chemical Physics, 34 Chemical sciences, 51 Physical sciences

Abstract:

Absorption spectra of complexes between Eu3+ and the dipicolinate (2,6-pyridinedicarboxylate) ligand are recorded for several metal-to-ligand ratios. The influence of complexation on the spectroscopic properties of Eu3+ is studied. The complexation is reflected in the spectrum by an increase of the spectral intensities of the induced electric dipole transitions, by a distinct crystal field fine structure of (2S+1)L(J) manifolds with small J quantum number and by a red shift of the absorption bands. The Judd-Ofelt intensity parameters Omega(lambda) (lambda = 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 5D0 <-- 7F0 transition provides information about the site symmetry of the Eu3+ ion.