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@ARTICLE{Saalfrank:51533,
      author       = {Saalfrank, R. W. and Scheurer, A. and Bernt, I. and
                      Heinemann, F. W. and Postnikov, A. V. and Schünemann, V.
                      and Trautwein, A. X. and Alam, M. S. and Rupp, H. and
                      Müller, P.},
      title        = {{T}he {F}e{III}[{F}e{III}({L}1)2]3 star-type
                      single-molecule magnet},
      journal      = {Dalton transactions},
      volume       = {23},
      issn         = {1477-9226},
      address      = {London},
      publisher    = {Soc.},
      reportid     = {PreJuSER-51533},
      pages        = {2865 - 2874},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Star-shaped complex [Fe(III)[Fe(III)(L1)2]3] (3) was
                      synthesized starting from N-methyldiethanolamine H2L1 (1)
                      and ferric chloride in the presence of sodium hydride. For
                      3, two different high-spin iron(III) ion sites were
                      confirmed by Mössbauer spectroscopy at 77 K. Single-crystal
                      X-ray structure determination revealed that 3 crystallizes
                      with four molecules of chloroform, but, with only three
                      molecules of dichloromethane. The unit cell of 3.4CHCl3
                      contains the enantiomers (delta)-[(S,S)(R,R)(R,R)] and
                      (lambda)-[(R,R)(S,S)(S,S)], whereas in case of 3.3CH2Cl2
                      four independent molecules, forming pairs of the enantiomers
                      [lambda-(R,R)(R,R)(R,R)]-3 and [lambda-(S,S)(S,S)(S,S)]-3,
                      were observed in the unit cell. According to SQUID
                      measurements, the antiferromagnetic intramolecular coupling
                      of the iron(III) ions in 3 results in a S = 10/2 ground
                      state multiplet. The anisotropy is of the easy-axis type.
                      EPR measurements enabled an accurate determination of the
                      ligand-field splitting parameters. The ferric star 3 is a
                      single-molecule magnet (SMM) and shows hysteretic
                      magnetization characteristics below a blocking temperature
                      of about 1.2 K. However, weak intermolecular couplings,
                      mediated in a chainlike fashion via solvent molecules, have
                      a strong influence on the magnetic properties. Scanning
                      tunneling microscopy (STM) and scanning tunneling
                      spectroscopy (STS) were used to determine the structural and
                      electronic properties of star-type tetranuclear iron(III)
                      complex 3. The molecules were deposited onto highly ordered
                      pyrolytic graphite (HOPG). Small, regular molecule clusters,
                      two-dimensional monolayers as well as separated single
                      molecules were observed. In our STS measurements we found a
                      rather large contrast at the expected locations of the metal
                      centers of the molecules. This direct addressing of the
                      metal centers was confirmed by DFT calculations.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-I},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB30},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Chemistry, Inorganic $\&$ Nuclear},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16751895},
      UT           = {WOS:000238049000017},
      doi          = {10.1039/b515980f},
      url          = {https://juser.fz-juelich.de/record/51533},
}