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| 001 | 1017129 | ||
| 005 | 20240708133958.0 | ||
| 037 | _ | _ | |a FZJ-2023-03950 |
| 041 | _ | _ | |a English |
| 100 | 1 | _ | |a Sauerwein, Fynn Sören |0 P:(DE-Juel1)167486 |b 0 |e Corresponding author |u fzj |
| 111 | 2 | _ | |a IEK-6 Institutsseminar |c Jülich |w Germany |
| 245 | _ | _ | |a Characterization of f-element complexes with soft-donorligands (f-Char) |f 2023-10-18 - |
| 260 | _ | _ | |c 2023 |
| 336 | 7 | _ | |a Conference Paper |0 33 |2 EndNote |
| 336 | 7 | _ | |a Other |2 DataCite |
| 336 | 7 | _ | |a INPROCEEDINGS |2 BibTeX |
| 336 | 7 | _ | |a LECTURE_SPEECH |2 ORCID |
| 336 | 7 | _ | |a Talk (non-conference) |b talk |m talk |0 PUB:(DE-HGF)31 |s 1698125139_21860 |2 PUB:(DE-HGF) |x Other |
| 336 | 7 | _ | |a Other |2 DINI |
| 520 | _ | _ | |a The 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. |
| 536 | _ | _ | |a 1412 - Predisposal (POF4-141) |0 G:(DE-HGF)POF4-1412 |c POF4-141 |f POF IV |x 0 |
| 536 | _ | _ | |a Verbundprojekt f-Char: Spektroskopische Charakterisierung von f-Element-Komplexen mit soft donor-Liganden, Teilprojekt D (02NUK059D) |0 G:(BMBF)02NUK059D |c 02NUK059D |x 1 |
| 700 | 1 | _ | |a Sittel, Thomas |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Grieser, Fabian |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Wilden, Andreas |0 P:(DE-Juel1)130438 |b 3 |u fzj |
| 700 | 1 | _ | |a Modolo, Giuseppe |0 P:(DE-Juel1)130383 |b 4 |u fzj |
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| 913 | 1 | _ | |a DE-HGF |b Forschungsbereich Energie |l Nukleare Entsorgung, Sicherheit und Strahlenforschung (NUSAFE II) |1 G:(DE-HGF)POF4-140 |0 G:(DE-HGF)POF4-141 |3 G:(DE-HGF)POF4 |2 G:(DE-HGF)POF4-100 |4 G:(DE-HGF)POF |v Nukleare Entsorgung |9 G:(DE-HGF)POF4-1412 |x 0 |
| 914 | 1 | _ | |y 2023 |
| 920 | _ | _ | |l yes |
| 920 | 1 | _ | |0 I:(DE-Juel1)IEK-6-20101013 |k IEK-6 |l Nukleare Entsorgung |x 0 |
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| 980 | _ | _ | |a UNRESTRICTED |
| 981 | _ | _ | |a I:(DE-Juel1)IFN-2-20101013 |
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