Understanding the complexation of the Eu3+ ion with TODGA, CMPO, TOPO and DMDBTDMA: Extraction, luminescence and theoretical investigation

摘要: Abstract A comparative study was carried out to understand the complexation behavior of Eu 3+ ion with important reagents, namely TODGA (N,N,N′,N′ tetraoctyl diglycolamide), CMPO (octyl (phenyl)-N, N-diisobutyl carbamoyl methyl phosphine oxide), DMDBTDMA (dimethyl dibutyl tetradecyl malonamide) and TOPO (tri-n-octyl oxide) in dodecane, used for separation actinides lanthanides from lab nuclear high-level wastes, by experimental (extraction luminescent) theoretical means. solvent extraction revealed metal–ligand stoichiometry as 1:3 all systems efficiency TOPO > CMPO > TODGA > DMDBTDMA at 1 M HNO 3 , while TODGA > CMPO > DMDBTDMA > TOPO 3 M . luminescence investigation presence single species extracted complex systems, no inner sphere water molecules except which had one molecule. The high intensity 5 D 0 – 7 F 2 transition ions an asymmetric environment local point group symmetry C 3v complexes, compared 3h complexes. Judd–Offelt parameters, radiative, non-radiative lifetimes, branching ratio, probabilities quantum efficiencies complexes were estimated compared. Three O-donor atoms each molecule coordinated first coordination sphere, three units found be a monodentate fashion. For Eu-TOPO complex, O donor six nitrate coordinated. Out ligands, bidentate mode, whereas two along ligands bonding