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

Abstract

A low-temperature high-resolution luminescence study of Ag₂Eu(DTPA) H₂O has been carried out. The Eu³⁺ luminescence spectrum was recorded over the spectral range which includes transitions from the ⁵D₀ excited state to the ⁷F_0-6 ground state manifolds and from the ⁵D₁ excited state to the ⁷F_0-2 ground state manifolds. The observed spectral patterns are analyzed using group theoretical methods so as to deduce the site symmetry of the Eu³⁺ ion in the complex. The analysis shows that the Eu³⁺ ion occupies a spectroscopic site symmetry that approaches a C_2v symmetry with distortion towards C₂ 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 Eu³⁺ ions in the title compound.

Key Words:

• Lanthanide luminescence
• Coordination chemistry
• Site symmetry analysis