A High Resolution Luminescence Study of Silver Diethylenetriaminepentaacetatoeuropate(III) Monohydrate

A low-temperature high-resolution luminescence study of Ag 2 Eu(DTPA) H 2 O has been carried out. The Eu 3+ luminescence spectrum was recorded over the spectral range which includes transitions from the 5 D 0 excited state to the 7 F 0-6 ground state manifolds and from the 5 D 1 excited state to the 7 F 0-2 ground state manifolds. The observed spectral patterns are analyzed using group theoretical methods so as to deduce the site symmetry of the Eu 3+ ion in the complex. The analysis shows that the Eu 3+ ion occupies a spectroscopic site symmetry that approaches a C 2v symmetry with distortion towards C 2 or lower symmetry. Results from the analysis are compared with previously reported Xray crystallographic results. In addition, the transition energies exhibited in the emission spectrum have been used to calculate the relative energies of the electronic levels characteristic of Eu 3+ ions in the title compound.