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@ARTICLE{Bator:18307,
      author       = {Bator, G. and Sawka-Dobrowolska, W. and Sobczyk, L. and
                      Grech, E. and Nowicka-Scheibe, J. and Pawlukojc, A. and
                      Wuttke, J. and Baran, J. and Owczarek, M.},
      title        = {4,4'-, 5,5'- and 6,6' -dimethyl-2,2'-bipyridyls: the
                      structures, phase transitions, vibrations and methyl group
                      tunneling of their complexes with chloranilic acid},
      journal      = {The journal of chemical physics},
      volume       = {135},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-18307},
      pages        = {044509},
      year         = {2011},
      note         = {This work was supported by the Polish Ministry of Science
                      and Higher Education (Project Register No. N N204 2497 34)
                      and partially by the International Programme ZIBJ DUBNA
                      04-4-1069-2009/2010.04.29 (Decision No. 868/W-ZIBJ
                      DUBNA/2010/0). This research project has been supported by
                      the European Commission under the 7th Framework Programme
                      through the Key Action: Strengthening the European Research
                      Area, Research Infrastructures (Contract No. 226507
                      (NMI3)).},
      abstract     = {The crystal and molecular structures of 4,4(')- and
                      6,6(')-dimethyl-2,2(')-bipyridyl complexes with
                      2,5-dichloro-3,6-dihydroxy-p-benzoquinone (chloranilic acid,
                      CLA) have been determined and compared with those of the
                      complex with the 5,5(')-derivative, which is known to
                      possess interesting antiferroelectric properties. In the
                      crystalline state, all three compounds form hydrogen bonded
                      chains with N(+)-H···O(-) and O-H···N bridges on both
                      sides of the bipyridyl constituent. The comparison of three
                      derivatives indicates that the N(+)-H···O(-) hydrogen
                      bonds are shortest for the 5,5(')-dimethyl complex. The
                      4,4(')- and 6,6(')-derivatives do not show any ferroelectric
                      feature. The 6,6(')-one is, however, characterized by a
                      continuous phase transition, revealed in the differential
                      scanning calorimetry, dilatometric, and dielectric
                      characteristics. The tunneling splitting measured by neutron
                      backscattering in the energy range ±30 μeV for the neat
                      dimethyl bipyridyls and their complexes with CLA indicates
                      that the different splittings are primarily due to the
                      crystal packing effect and that charge transfer between
                      interacting compounds plays only a minor role.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS-FRM-II (JCNS (München) ; Jülich Centre for
                      Neutron Science JCNS (München) ; JCNS-FRM-II) / JCNS-1 /
                      JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21806140},
      UT           = {WOS:000293477300058},
      doi          = {10.1063/1.3613640},
      url          = {https://juser.fz-juelich.de/record/18307},
}