Synthesis and Screening of Modified 6,6′-Bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo[<i>e</i>][1,2,4]triazin-3-yl)-2,2′-bipyridine Ligands for Actinide and Lanthanide Separation in Nuclear Waste Treatment

Effects of chloro and bromo substitution at the 4-position of the pyridine ring of 6,6′-bis­(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo­[<i>e</i>]­[1,2,4]­triazin-3-yl)-2,2′-bipyridine (CyMe₄-BTBP) have been studied with regard to the extraction of Am­(III) from Eu­(III) and Cm­(III) from 0.1–3 M HNO₃. Similarly to CyMe₄-BTBP, a highly efficient (<i>D</i>_Am > 10 at 3 M HNO₃) and selective (SF_Am/Eu > 100 at 3 M HNO₃) extraction was observed for Cl-CyMe₄-BTBP and Br-CyMe₄-BTBP in 1-octanol but in the absence of a phase-transfer agent