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@ARTICLE{Ionova:46729,
      author       = {Ionova, G. and Ionov, S. and Rabbe, C. and Madic, C. and
                      Guillaumont, R. and Modolo, G. and Krupa, J. C.},
      title        = {{M}echanism of trivalent actinide/lanthanide separation
                      using synergistic mixtures of di (chlorophenyl)
                      dithiophosphinic acid and neutral o-bearing co-extractants},
      journal      = {New journal of chemistry},
      volume       = {25},
      number       = {3},
      issn         = {1144-0546},
      address      = {London},
      publisher    = {RSC},
      reportid     = {PreJuSER-46729},
      pages        = {491 - 501},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The mechanism of synergistic selective extraction of
                      Am(III) over Eu(III) from aqueous nitric acid solutions
                      using di(chlorophenyl)dithiophosphinic acid [(Cl
                      Phi)(2)PSSH] and neutral O-bearing organophosphorus
                      co-extractants (B) has been investigated. (Cl Phi)(2)PSSH
                      forms weaker complexes with Am(III) than R2PSSH (where R =
                      alkyl group). However, the Am(III)/(Cl Phi)(2)PSSH complexes
                      are stronger than the corresponding Eu(III)/(Cl Phi)(2)PSSH
                      complexes, although the difference is not as large as in the
                      case of the corresponding complexes formed with R2PSSH. The
                      donor properties of co-extractants are also discussed.
                      Chemical shifts in the P-31 NMR spectra of the
                      organophosphorus co-extractants correlate qualitatively with
                      the extractability of Am(III) and Eu(III) in (Cl Phi)(2)PSSH
                      + B synergistic mixtures. The synergistic effect determines
                      the selectivity not only qualitatively but also
                      quantitatively. The high selectivity observed using
                      tri-2-ethylhexyl phosphate (T2EHP) is caused by a
                      synergistic bonding effect for the Am(III) complex and an
                      antagonistic effect for Eu(III).A donor-acceptor mechanism
                      is shown to promote Am(III) extraction for almost all B
                      co-extractants. A contribution of entropy terms for
                      extracted Eu(III) extraction is assumed to be significant.
                      Interatomic distances REu-S in the Eu(III) complexes are
                      calculated.The softness of S-bearing extractants XYPSSH
                      (with X and Y = R, RO or ClC6H4) is discussed from the point
                      of view of the effective charge carried by the S atoms. The
                      hardness of Eu(III) and Am(III) is evaluated.},
      keywords     = {J (WoSType)},
      cin          = {ISR-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ISR-3-20090406},
      pnm          = {Nukleare Entsorgungsforschung},
      pid          = {G:(DE-Juel1)FUEK25},
      shelfmark    = {Chemistry, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000167327300026},
      doi          = {10.1039/b006745h},
      url          = {https://juser.fz-juelich.de/record/46729},
}