001017129 001__ 1017129
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001017129 037__ $$aFZJ-2023-03950
001017129 041__ $$aEnglish
001017129 1001_ $$0P:(DE-Juel1)167486$$aSauerwein, Fynn Sören$$b0$$eCorresponding author$$ufzj
001017129 1112_ $$aIEK-6 Institutsseminar$$cJülich$$wGermany
001017129 245__ $$aCharacterization of f-element complexes with soft-donorligands (f-Char)$$f2023-10-18 - 
001017129 260__ $$c2023
001017129 3367_ $$033$$2EndNote$$aConference Paper
001017129 3367_ $$2DataCite$$aOther
001017129 3367_ $$2BibTeX$$aINPROCEEDINGS
001017129 3367_ $$2ORCID$$aLECTURE_SPEECH
001017129 3367_ $$0PUB:(DE-HGF)31$$2PUB:(DE-HGF)$$aTalk (non-conference)$$btalk$$mtalk$$s1698125139_21860$$xOther
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001017129 520__ $$aThe German research project f-Char, funded by the German Federal Ministry of Education and Research (BMBF), contributes to a better understanding of the coordination chemistry of ac-tinide (An) and lanthanide (Ln) ions with ligands coordinating via soft donor atoms, e.g., N donor atoms. Since recycling of minor actinides from PUREX raffinate solution is a decisive step towards closing the nuclear fuel cycle, current research focuses on the challenging sepa-ration of Am(III) from Cm(III) and other trivalent fission lanthanides. The Americium Selective (AmSel) process[1] was designed for this task combining the water-soluble tetradentate N-do-nor ligand SO3-Ph-BTBP (tetrasodium-3,3',3'',3'''-([2,2'-bipyridine]-6,6'-diylbis(1,2,4-triazine-3,5,6-triyl))tetrabenzenesulfonate) with the well-known An(III)/Ln(III) coextracting agent TODGA (N,N,N',N'-tetra-n-octyl diglycolamide). While the separation of Am from Cm and the light Ln (La-Gd) is possible, a significant drop in distribution ratios of the heavy Ln (Tb-Lu) can be observed for ≥ 1 mol L-1 HNO3. This unusual behavior was further investigated looking at the complexation of SO3-Ph-BTBP with different Ln using different spectroscopic methods (UV/Vis, NMR). While SO3-Ph-BTBP complexation at low nitric acid concentration (10-3 mol L-1 HNO3) is observed for all lanthanides (Nd, Sm, Ho, Lu), complex formation at high nitric acid concentration (3 mol L-1 HNO3) is only observed for heavy Ln (Ho, Lu). Regardless of the nitric acid concentration, NMR spectra always show the same SO3-Ph-BTBP complex speciation with Ln. Interestingly, the complexation equilibrium for heavy Ln in 3 mol L-1 nitric acid solution is established very slowly (6 – 22 h). This effect was also confirmed by kinetic batch extraction studies and is presumably caused by the kinetically inhibited (de)complexation of the [Ln(SO3-Ph-BTBP)x] complexes. However, the mechanism is not yet understood and requires further studies.Furthermore, the two new N-donor ligands MTB (6-(6-methyl-1,2,4,5-tetrazin-3-yl)-2,2'-bipyr-idine) and PPTMP ((4-(6-(1,10-phenanthrolin-2-yl)pyridin-2-yl)-1H-1,2,3-triazol-1-yl)methyl pivalate) were tested as alternative extractants for the An(III)/Ln(III) separation. Both extract-ants were able to achieve good extraction efficiency into different diluents (tert-butylbenzene, toluene, nitrobenzene) at low nitric acid concentrations < 0.1 mol L-1 HNO3 and in presence of the lipophilic anion source 2-bromodecanoic acid.[1] C. Wagner et al., Solvent Extr. Ion Exch., 2016. 34 (2): p. 103-113, DOI: 10.1080/07366299.2015.1129192.
001017129 536__ $$0G:(DE-HGF)POF4-1412$$a1412 - Predisposal (POF4-141)$$cPOF4-141$$fPOF IV$$x0
001017129 536__ $$0G:(BMBF)02NUK059D$$aVerbundprojekt f-Char: Spektroskopische Charakterisierung von f-Element-Komplexen mit soft donor-Liganden, Teilprojekt D (02NUK059D)$$c02NUK059D$$x1
001017129 7001_ $$0P:(DE-HGF)0$$aSittel, Thomas$$b1
001017129 7001_ $$0P:(DE-HGF)0$$aGrieser, Fabian$$b2
001017129 7001_ $$0P:(DE-Juel1)130438$$aWilden, Andreas$$b3$$ufzj
001017129 7001_ $$0P:(DE-Juel1)130383$$aModolo, Giuseppe$$b4$$ufzj
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001017129 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)167486$$aForschungszentrum Jülich$$b0$$kFZJ
001017129 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130438$$aForschungszentrum Jülich$$b3$$kFZJ
001017129 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130383$$aForschungszentrum Jülich$$b4$$kFZJ
001017129 9131_ $$0G:(DE-HGF)POF4-141$$1G:(DE-HGF)POF4-140$$2G:(DE-HGF)POF4-100$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-1412$$aDE-HGF$$bForschungsbereich Energie$$lNukleare Entsorgung, Sicherheit und Strahlenforschung (NUSAFE II)$$vNukleare Entsorgung$$x0
001017129 9141_ $$y2023
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