The optical absorption spectra of neodymium(III) butanoate, pentanoate, hexanoate, heptanoate and octanoate in 1-pentanol have been measured. This solvent has been chosen, because the neodymium(III) soaps are sufficiently soluble in it. A set of free-ion parameters is obtained by fitting the calculated energy levels against the experimental levels. The experimental dipole strengths of the transitions are determined from the absorption spectra and parameterised in terms of the Judd-Ofelt intensity parameters V (l52, 4, 6). The V values l 4 go through a maximum for neodymium(III) hexanoate, whereas the V parameter increases in the order butanoate,pentanoate, 2 hexanoate,heptanoate,octanoate. The V parameter shows only an increase between the butanoate and the pentanoate complex, whereas 6 this parameter remains fairly constant for the higher homologues of the neodymium(III) soaps.
The absorption and luminescence spectra of the solid compound Eu{[C(CH 3 )(OH)(PO 3 H 2 )(PO 3 H)][C(CH 3 )(OH)-(PO 3 H) 2 ]} (also written as Eu(H 3 L)(H 2 L)) are measured by dispersing the microcrystalline complex in a silicone film. Nine free ion levels and eight crystal field levels are identified. A set of 20 free ion parameters for Eu 3+ is optimized. The crystal field levels are calculated using these optimized free ion levels combined with a set of crystal field parameters for the analogous Er 3+ complex assuming a C 2V site symmetry. The experimental crystal field levels are in good agreement with the calculated levels. This means that the site symmetry of both lanthanide ions in this complex can be described by a C 2V point symmetry. In acidic (pH < 2) solutions in 2 M NaNO 3 medium, Eu 3+ and 1-hydroxyethane-1,1-diphosphonic acid (HEDP) form several complexes. By measuring the overall absorption spectra of Eu 3+ and HEDP as function of the ratio Eu 3+ /HEDP and at different pH values, the absorption spectra of the Eu(H 3 L) 2+ , Eu(H 3 L) 2 + , and Eu(H 3 L) 2 (H 2 L) -complexes are deduced. By analysis of the shape of the hypersensitive transition, 5 D 2 r 7 F 0 , and the intensities of all the electric dipole transitions of the Eu 3+ ion, it was found that the site symmetry of the Eu 3+ ion in the Eu(H 3 L) 2 (H 2 L) -complex is similar to the site symmetry of the Eu 3+ in the neutral Eu(H 3 L)(H 2 L) solid complex. The site symmetry of the Eu 3+ ion in the Eu(H 3 L) 2+ and in the Eu(H 3 L) 2 + complexes was found to be similar to the site symmetry of the free Eu 3+ in 2 M NaNO 3 solution.
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