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@INPROCEEDINGS{DiazGomez:907868,
      author       = {Diaz Gomez, Laura Johana and Wilden, Andreas and Modolo,
                      Giuseppe and Gullo, Maria Chiara and Verboom, Willem},
      title        = {{S}creening of modified diglycolamide diastereomers to
                      increase {A}m({III}) selectivity during the partitioning of
                      {PUREX} raffinate solution},
      reportid     = {FZJ-2022-02257},
      year         = {2022},
      abstract     = {Multiple strategies have been developed to separate
                      lanthanides (Ln) and actinides (An) from Spent Nuclear Fuel
                      (SNF) and PUREX raffinate through solvent extraction.
                      Current research is focusing on the development of new
                      ligands to separate Am(III) from Cm(III) and other fission
                      Ln(III). Diglycolamides (DGA) such as
                      N,N,N′,N′‐tetra-n-octyl diglycolamide (TODGA) are
                      promising extractants for this task. Recently, methyl
                      substitutions in the backbone of TODGA with different
                      orientation were studied, and interesting effects on the
                      selectivity for Am(III) over Cm(III) and other Ln(III) were
                      observed.[1] The orientation on the alkyl groups has shown
                      different behavior reflected on the affinity for Am(III) and
                      efficiency of the system. Here, we study the selectivity and
                      affinity of two related extractants (TODGA and
                      N,N,N′,N′-tetra-n-decyl diglycolamide, TDDGA) with
                      dipropyl and ethyl-methyl substitutions in the backbone, and
                      their respective diastereomers (syn or anti 0.1 M in
                      n-dodecane). An inverse selectivity is observed for Am(III)
                      over Cm(III) and other Ln(III) at high nitric acid
                      concentration (7 - 10 M). The steric hindrance gives low
                      distribution ratios D < 1.5 for trivalent metal ions. Pu
                      (IV) was also tested for the interest in the complexation
                      behavior with tetravalent ions. Pu(IV) shows high
                      distribution values at the same HNO3 concentration (D > 10).
                      The separation factors are inversely proportional to the
                      HNO3 concentration. The syn-ethyl-methyl substitutions for
                      both analogues showed the highest D values for Am(III) among
                      the other ligands, giving a promising molecule for further
                      studies. The results of the extraction studies will be
                      presented and discussed in the poster.1. Wilden, A.;
                      Kowalski, P. M.; Klaß, L.; Kraus, B.; Kreft, F.; Modolo,
                      G.; Li, Y.; Rothe, J.; Dardenne, K.; Geist, A.; Leoncini,
                      A.; Huskens, J.; Verboom, W. Unprecedented Inversion of
                      Selectivity and Extraordinary Difference in the Complexation
                      of Trivalent f-Elements by Diastereomers of a Methylated
                      Diglycolamide. Chem. Eur. J. 2019, 25, 21, 5507-5513.
                      DOI:10.1002/chem.201806161.},
      month         = {May},
      date          = {2022-05-15},
      organization  = {19th Radiochemical Conference (RadChem
                       2022), Mariánské Lázně (Czech
                       Republic), 15 May 2022 - 20 May 2022},
      subtyp        = {Other},
      cin          = {IEK-6},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {1412 - Predisposal (POF4-141) / SEPAM - Verbundprojekt:
                      Untersuchungen zur SEParation von Americium aus
                      hochradioaktiven Abfalllösungen (SEPAM), Teilprojekt A
                      (02E11921A)},
      pid          = {G:(DE-HGF)POF4-1412 / G:(DE-Juel1)02E11921A},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/907868},
}