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Extraction and complexation studies with 2,6-bis(5-(tert-butyl)-1H-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 SFAm(III)/Eu(III) ≈ 200...

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Main Authors: Stracke, Jonas (Author) , Weßling, Patrik (Author) , Sittel, Thomas (Author) , Meiners, Paul (Author) , Geist, Andreas (Author) , Panak, Petra (Author)
Format: Article (Journal)
Language:English
Published: 05 Sep 2024
In: RSC Advances
Year: 2024, Volume: 14, Issue: 39, Pages: 28415-28422
ISSN:2046-2069
DOI:10.1039/D4RA05630B
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1039/D4RA05630B
Verlag, kostenfrei, Volltext: https://pubs.rsc.org/en/content/articlelanding/2024/ra/d4ra05630b
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Author Notes:Jonas Stracke, Patrik Weßling, Thomas Sittel, Paul Meiners, Andreas Geist and Petra J. Panak
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Summary: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 SFAm(III)/Eu(III) ≈ 200 and SFAm(III)/Nd(III) ≈ 60 in comparison with the structurally similar ligand 2,6-bis(5-neopentyl-1H-pyrazol-3-yl)pyridine C5-BPP (SFAm(III)/Eu(III) ≈ 100), even though C5-BPP showed significantly higher stability constants. Time-resolved laser fluorescence spectroscopy (TRLFS) studies revealed the formation of the ternary 1 : 1 and 1 : 2 complexes [Eu(C4-BPP)n(2-bromohexanoate)m](3−m)+ (n = 1-2) ( and ). [Eu(C4-BPP)2(2-bromohexanoate)m](3−m)+ was the relevant complex species in solvent extraction. In contrast, Cm(III) form stable 1 : 3 complexes. The ability of 2-bromohexanoic acid to replace C4-BPP from the inner coordination sphere of Eu(III) but not from Cm(III) is due to a more favorable complexation of Cm(III) over Eu(III) with C4-BPP. This resulted in a notably more efficient separation of An(III) and Ln(III) in comparison with C5-BPP.
Item Description:Gesehen am 14.02.2025
Physical Description:Online Resource
ISSN:2046-2069
DOI:10.1039/D4RA05630B

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