Time-Resolved Laser Fluorescence Spectroscopy Study of the Coordination Chemistry of a Hydrophilic CHON [1,2,3-Triazol-4-yl]pyridine Ligand with Cm(III) and Eu(III).
The complexation of Cm(III) and Eu(III) with the novel i-SANEX complexing agent 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine (PTD) was studied by time-resolved laser fluorescence spectroscopy (TRLFS). The formation of 1:3, 1:2, and 1:1 metal/ligand complexes was identified upon increasing PTD concentration in 10-3mol/L HClO4and in 0.44 mol/L HNO3solutions. For all these complexes, stability constants were determined at different acid concentrations. Though under the extraction conditions proposed for an An/Ln separation process, that is, for 0.08 mol/L PTD in 0.44 mol/L HNO3, 1:3 complexes represent the major species, a significant fraction of 1:2 complexes was found. This is caused by ligand protonation, and results in lower Eu(III)/Am(III) separation factors compared to SO3-Ph-BTP, until now considered the i-SANEX reference ligand. Focused extraction studies performed at lower proton concentration, where the 1:3 complex is formed exclusively, confirm this assumption.
Universität Heidelberg , Institut für Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.|Karlsruher Institut für Technologie (KIT) , Institut für Nukleare Entsorgung (INE), P.O. Box 3640, 76021 Karlsruhe, Germany.
Christoph
http://orcid.org/0000-0003-4530-4094
C
Wagner
Politecnico di Milano , Department of Energy, Nuclear Engineering Division, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Eros
E
Mossini
Politecnico di Milano , Department of Energy, Nuclear Engineering Division, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Elena
E
Macerata
Politecnico di Milano , Department of Energy, Nuclear Engineering Division, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Mario
M
Mariani
Università di Parma , Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Area delle Scienze 17/a, 43124 Parma, Italy.
Arturo
A
Arduini
Università di Parma , Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Area delle Scienze 17/a, 43124 Parma, Italy.
Alessandro
http://orcid.org/0000-0001-9993-3262
A
Casnati
Karlsruher Institut für Technologie (KIT) , Institut für Nukleare Entsorgung (INE), P.O. Box 3640, 76021 Karlsruhe, Germany.
Andreas
A
Geist
Universität Heidelberg , Institut für Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.|Karlsruher Institut für Technologie (KIT) , Institut für Nukleare Entsorgung (INE), P.O. Box 3640, 76021 Karlsruhe, Germany.
Petra J
PJ
Panak