Extraction and complexation studies with 2,6-bis(5-(<em>tert</em>-butyl)-1<em>H</em>-pyrazol-3-yl)pyridine in the presence of 2-bromohexanoic acid

To improve the understanding of the extraction chemistry of An(iii) and Ln(iii) with N-donor ligands 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine (C4-BPP) in the presence of 2-bromohexanoic acid was investigated. Extraction studies showed an excellent separation factor of SF(Am(III)/Eu(III)) ≈ 200 and SF(Am(III)/Nd(III)) ≈ 60 in comparison with the structurally similar ligand 2,6-bis(5-neopentyl-1H-pyrazol-3-yl)pyridine C5-BPP (SF(Am(III)/Eu(III)) ≈ 100), even though C5-BPP …