Di(2-ethyl hexyl) butyramide and di(2-ethyl hexyl)isobutyramide as extractants for uranium(VI) and plutonium(IV)

Spectrophotometric Analysis of Ternary Uranyl Systems to Replace Tri-N-butyl Phosphate (TBP) in Used Fuel Reprocessing

“…It appears that even when the ligand concentration is less than the uranyl concentration, a 102 complex is strongly preferred over a potential 101 complex. These findings also correlate with many studies that use slope analysis to determine complex stoichiometry [5,[40][41][42], recent structural and spectroscopic studies of uranyl-monoamide complexes [43,44], as well as previous spectrophotometric studies with hexavalent actinides [45,46] when considering these systems at low acidity ([HNO 3 ] < 4 mol·L −1 ).…”

“…The larger carbonyl-side chain likely provides stability to the amide bond, resulting in a larger donor strength on the carbonyl oxygen. The stability constants determined by SQUAD are comparable to those determined by Prabhu et al [42], which lends support to the SQUAD methodology for stability constant determination.…”

Redox behavior of gas phase Pu(IV)-monodentate ligand complexes: an investigation by electrospray ionization mass spectrometry

“…Numerous approaches have been used to characterize these complexes, for example, distribution ratio measurements [4,7,8,[12][13][14][15][16], spectroscopic characterization [4,[16][17][18], and thermodynamic data measurements [7,8,13,15,19]. While classical solution chemistry methods are informative and helpful in providing insight into the coordination behavior of Pu(IV) with these ligands, there are only a few publications on the use of electrospray ionization mass spectrometry (ESI-MS) to obtain information on Pu(IV) complexes in solution.…”

“…Indeed dialkylamides have been under study as potential candidates for plutonium extraction since the 1960's [10]. Some advantages monoamides offer over TBP include the ability to easily remove degradation products from the solvent stream, their complete incinerability [3,9,11], and the important influence of the alkyl groups R, R 0 , and R 00 on the extraction of Pu(IV) [4,5,7,9,[11][12][13][14].…”

“…The affinity for Pu(IV) extraction by N,N-dialkylamides strongly depends on the structure of the amide, especially the structure of the alkyl group on the carbonyl carbon [4,5,[12][13][14]. In this study, three monoamides were selected to better understand the effect of structure on the stability of the Pu-monoamide ion: Fig.…”