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@ARTICLE{Malaestean:22478,
      author       = {Malaestean, I.L. and Kutluca, M. and Speldrich, M. and
                      Ellern, A. and Kögerler, P.},
      title        = {{M}acrocycles based on magnetically functionalized
                      zirconium oxide clusters},
      journal      = {Inorganica chimica acta},
      volume       = {380},
      issn         = {0020-1693},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-22478},
      pages        = {72 - 77},
      year         = {2012},
      note         = {Ames Laboratory is operated for the U.S. Department of
                      Energy by Iowa State University under Contract No.
                      DE-AC02-07CH11358.},
      abstract     = {In the presence of 4,4'-bipyridine and Co(II) or Ni(II)
                      groups, which are coordinatively constrained by
                      bis-alkoxyamine chelating groups, dimeric
                      [(Zr6O4)-O-IV(OH)(4)(RCOO)(12)](2) clusters rearrange to
                      {Zr12O11(OH)(11)(RCOO)(16)} frameworks featuring highly
                      condensed zirconium oxide cores. These {Zr-12} groups
                      subsequently each coordinate to three M(II) groups and
                      self-assemble via two bridging 4,4'-bpy into 2.6 nm
                      {M6Zr24}type macrocycles of composition
                      [M6Zr24O22(OH)(22)(C2H5COO)(40)(Hmdea)(2)(H(2)mdea)(4)(4,4'-bpy)(2)].
                      Surprisingly, two M(II) sites peripherally attached to the
                      {Zr-12} frameworks adopt a rare eightfold coordination mode
                      where the M2+ ions reside in a distorted square
                      antiprismatic O7N environment. Magnetic measurements reveal
                      that the zirconium oxide fragments efficiently mediate
                      antiferromagnetic exchange between Ni2+ spin centers,
                      whereas in case of the virtually isostructural Co2+
                      derivative pronounced ligand field asymmetry causes
                      single-ion effects to significantly influence the low-field
                      susceptibility data. (C) 2011 Elsevier B. V. All rights
                      reserved.},
      keywords     = {J (WoSType)},
      cin          = {PGI-6},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Chemistry, Inorganic $\&$ Nuclear},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000300180100010},
      doi          = {10.1016/j.ica.2011.08.061},
      url          = {https://juser.fz-juelich.de/record/22478},
}