1350558-97-2Relevant academic research and scientific papers
Synthesis and evaluation of novel water-soluble ligands for the complexation of metals during the partitioning of actinides
Iqbal, Mudassir,Huskens, Jurriaan,Sypula, Michal,Modolo, Giuseppe,Verboom, Willem
experimental part, p. 2591 - 2600 (2012/01/04)
Different types of water-soluble ligands were synthesized and their capability was evaluated by solvent extraction studies to complex trivalent actinides and suppress their extraction by a strong lipophilic ligand, such as TODGA. The back extraction efficiency of hydrophilic diglycolamide (DGA) derivatives with a varying number of ethylene glycol groups, or containing sodium acetate moieties on the amidic nitrogen shows a decrease in back-extraction efficiency with increasing number of ethylene glycol units on the amidic nitrogen at various pH values of the aqueous phase. Among the PS donating ligands only the ligand with a malonamide backbone exhibits a high reverse extraction efficiency, although, with no selectivity for americium. Within the water-soluble tripodal ligands, i.e. the amide derivatives of nitrilotriacid with N,N-dimethyl and N,N-bis(hydroxyethyl) moieties, the first one shows a pronounced selectivity for Am(iii) over Eu(iii), with a maximum separation factor of 11.1, while the latter one more efficiently complexes the radionuclides in the aqueous phase with a maximum separation factor of 5. Isothermal microcalorimetry experiments of the complexation of Eu(iii) by a selected series of ligands confirm the observed trend in the back extraction properties.
