title: 1,10-Phenanthroline and non-symmetrical 1,3,5-triazine dipicolinamide-based ligands for group actinide extraction.
abstract: The synthesis and evaluation of new extractants for spent nuclear fuel reprocessing are described. New bitopic ligands constituted of phenanthroline and 1,3,5-triazine cores functionalized by picolinamide groups were designed. Synthetic routes were investigated and optimized to obtain twelve new polyaza-heterocyclic ligands. In particular, an efficient and versatile methodology was developed to access non-symmetric 2-substituted-4,6-di(6-picolin-2-yl)-1,3,5-triazines from the 1,3,5-triazapentadiene precursor in the presence of anhydride reagents. Extraction studies showed the ability of both ligand series to extract and separate actinides selectively at different oxidation states (U(VI), Np(V,VI), Am(III), Cm(III), and Pu(IV)) from an acidic solution (3 M HNO3). Phenanthroline-based ligands show the most promising efficiency for use in the group actinide extraction (GANEX) process due to a higher number of donor nitrogen atoms and a suitable pre-organization of the dipicolinamide-1,10-phenanthroline architecture.
authors.affiliation: CEA-Nuclear Division Energy, Radiochemistry & Process Department, 30207 Bagnols-sur-Cèze (France); Université de Nantes, CEISAM UMR-CNRS 6230, UFR des Sciences et Techniques, 2 rue de la Houssiniere BP 92208, 44322 Nantes Cedex 3 (France).
authors.forename: Julia
authors.initials: J
authors.lastname: Bisson
authors.forename: Jérémy
authors.initials: J
authors.lastname: Dehaudt
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Charbonnel
authors.forename: Denis
authors.initials: D
authors.lastname: Guillaneux
authors.forename: Manuel
authors.initials: M
authors.lastname: Miguirditchian
authors.forename: Cécile
authors.initials: C
authors.lastname: Marie
authors.forename: Nathalie
authors.initials: N
authors.lastname: Boubals
authors.forename: Guy
authors.initials: G
authors.lastname: Dutech
authors.forename: Muriel
authors.initials: M
authors.lastname: Pipelier
authors.forename: Virginie
authors.initials: V
authors.lastname: Blot
authors.forename: Didier
authors.initials: D
authors.lastname: Dubreuil
keywords: actinides; heterocycles; lanthanides; ligands; synthetic methods