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@INPROCEEDINGS{DiazGomez:909859,
author = {Diaz Gomez, Laura Johana and Wilden, Andreas and Modolo,
Giuseppe and Gullo, M. C. and Verboom, Willem},
title = {{S}olvent extraction studies of different diastereomers of
modified diglycolamide ligands for {A}n({III}) and
{L}n({III}) extraction},
reportid = {FZJ-2022-03472},
year = {2022},
abstract = {Solvent extraction is currently the preferred technique for
the separation of actinides (An) from fission products(FP),
and especially lanthanides (Ln), as constituents of Spent
Nuclear Fuel (SNF) or PUREX raffinate. A specialinterest is
on the separation of Am from Cm, Ln and other FP by testing
various ligands to upgrade the currentmethods. Diglycolamide
(DGA) derivatives have shown promising results as
extractants for trivalent Ln and An,such as,
N,N,N’,N’-tetra-n-octyl diglycolamide (TODGA), which
usually have a higher affinity for Cm(III) overAm(III).
Wilden et al. [1] reported a change on Am(III) selectivity
over Cm(III) with methyl substitutions withdifferent
orientation in the backbone of Me2-TODGA. Here, we study the
selectivity and affinity of relatedextractants (TODGA and
N,N,N’,N’-tetra-n-decyl diglycolamide, TDDGA) with
dipropyl and ethyl-methylsubstitutions in the molecule
backbone, and their respective diastereomers (syn or anti)
in n-dodecane. Thechemical structures are shown in Figure 1
An inverse selectivity is observed for Am(III) over Cm(III)
and otherLn(III) at high nitric acid concentration (7 - 10
mol L-1 HNO3). The steric hindrance gives low distribution
ratios(D < 1.5) for the trivalent metal ions at 0.1 mol L-1
ligand concentration, as shown in Figure 2. Besides
trivalentions, Pu(IV) was also tested with the interest on
the complexation behavior with tetravalent ions, which
showsremarkably higher distribution ratios at the same HNO3
concentrations (D > 10). This is unlike methyl
anddimethyl-TODGA, which present similar distribution ratios
between trivalent and tetravalent metal ions. The
synethyl-methyl substitutions for both analogues showed the
highest D values for Am(III) among the tested ligands,giving
a promising molecule for further studies. The results of the
extraction studies will be presented anddiscussed in the
poster.References1. Wilden, A., et al., Unprecedented
Inversion of Selectivity and Extraordinary Difference in
theComplexation of Trivalent f-Elements by Diastereomers of
a Methylated Diglycolamide. Chem. Eur. J.,2019. 25(21): p.
5507-5513.},
month = {Sep},
date = {2022-09-21},
organization = {Actinides Revisited (AnRev) 2022,
Dresden (Germany), 21 Sep 2022 - 23 Sep
2022},
subtyp = {Other},
cin = {IEK-6},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {1412 - Predisposal (POF4-141) / Verbundprojekt:
Untersuchungen zur SEParation von AMericium aus
hochradioaktiven Abfalllösungen (SEPAM), Teilprojekt A
(02E11921A)},
pid = {G:(DE-HGF)POF4-1412 / G:(BMWi)02E11921A},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/909859},
}