Abstract
Analysis of high-resolution absorption and emission spectra of europium(III) triacetate tetrahydrate (EuAC) crystal enabled assignment of 130 experimental crystal-field levels of the 4f 6 configuration between 0 and 35,050 cm −1. These experimentally determined levels were simulated using a semi-empirical 35 parameters Hamiltonian representing the combined free-ion and crystal-field interactions for Eu 3+ ion in the C 1 symmetry site, with the final relatively low r.m.s. deviation of 9.0 cm −1. The reliable starting values of B q k parameters were obtained from the superposition model analysis. The crystal-field strength ( S cf) for EuAC is slightly smaller than for europium(III) trioxydiacetate complex (EuODA). It is probably brought about by the presence of two water molecules in the first coordination sphere of the metal ion in the acetate crystal.
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