6,6′‐Bis(5,5,8,8‐tetramethyl‐5,6,7,8‐tetrahydro‐benzo[1,2,4]triazin‐3‐yl) [2,2′]bipyridine, an Effective Extracting Agent for the Separation of Americium(III) and Curium(III) from the Lanthanides

Interaction of 6,6′′-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2′:6′,2′′-terpyridine (CyMe4-BTTP) with some trivalent ions such as lanthanide(iii) ions and americium(iii)

“…In comparison, CyMe 4 -BTBP 3 gives a distribution coefficient of approximately 4.5 at a nitric acid concentration of 0.5 mol dm −3 . 7 The resulting separation factors were uniform over this range of nitric acid concentration increasing to a maximum of 12.0 before decreasing to 6.6 in 4.0 molar 70 nitric acid. However, some emulsion formation was observed at all nitric acid concentrations except 4.0 molar.…”

“…This decrease at higher nitric acid 85 concentrations is due to the inability of 2-bromohexanoic acid to dissociate and form a more lipophilic complex with the Am(CyMe 4 -BTTP) 3+ cation. Employing N,N'-dimethyl-N,N'-dioctyl-2-(2-hexoxyethyl) malondiamide (DMDOHEMA) [7][8]23 as a phase-modifier did not lead to any significant 90 improvement. (Figure 5).…”

“…4 Two classes of ligand have emerged that show both high affinities and high selectivities towards the trivalent actinides; the 2,6-bistriazinylpyridines (BTPs) 5 1 and the 6,6'-bistriazinyl-2,2'-bipyridines (BTBPs) 6 45 2 ( Figure 1). One member of the BTBP ligands (CyMe 4 -BTBP 3) 7 has shown many of the desirable qualities (stability towards hydrolysis and relative stability towards radiolysis, reversible metal binding which allows stripping, etc) for use in an industrial separation process. Its suitability for a 50 SANEX process has been demonstrated recently in a 'hotpartitioning demonstration test' on genuine spent fuel solution.…”

Complexation of lanthanides, actinides and transition metal cations with a 6-(1,2,4-triazin-3-yl)-2,2′:6′,2′′-terpyridine ligand: implications for actinide(iii)/lanthanide(iii) partitioning

“…The terdentate 2,6-bis (1,2,4-triazin-3-yl)pyridine (BTP) 6 and the quadridentate 6,6'-bis(1,2,4-triazin-3-45 yl)-2,2'-bipyridine (BTBP) 7 ligands have been the focus of intensive research. The annulated ligand CyMe 4 -BTBP 1 8 ( Figure 1) is currently the most suitable for An(III)/Ln(III) separations, as recently demonstrated under process conditions. 9 It has also been shown that the extraction properties of 1 can be markedly 50 improved by pre-organization of the ligand using a 1, 10-phenanthroline moiety.…”

High-Performance Alkyl Diamide Amine and Water-soluble Diamide Ligand for Separating of Am(III) from Cm(III)

“…The separation of these two closely related MAs is even more challenging than that of MA(III) and Ln(III). [3][4][5] Although various ligands and separation methods have been studied for the Am(III)/Cm(III) separation, [6][7][8][9][10][11] an effective approach for practical use has not yet been developed.…”