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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},
}