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@ARTICLE{Rok:885912,
      author       = {Rok, Magdalena and Moskwa, Marcin and Dopieralski,
                      Przemysław and Medycki, Wojciech and Zamponi, Michaela and
                      Bator, Grażyna},
      title        = {{T}he influence of structure on the methyl group dynamics
                      of polymorphic complexes: 6,6′-dimethyl-2,2′-dipyridyl
                      with halo derivatives of benzoquinone acids},
      journal      = {CrystEngComm},
      volume       = {22},
      number       = {41},
      issn         = {1466-8033},
      address      = {London},
      publisher    = {RSC},
      reportid     = {FZJ-2020-04176},
      pages        = {6811 - 6821},
      year         = {2020},
      note         = {template des Verlags!},
      abstract     = {Recently, interest in organic ferroelectrics or
                      antiferroelectrics representing a metal-free perovskite-type
                      has increased significantly. This interest results from the
                      properties of organic systems. First of all, they do not
                      have toxic metals in their structure. Therefore they are
                      environmentally friendly. Also, the method of preparation,
                      simple syntheses, and low-temperature processability
                      increase their attractiveness in terms of application. In
                      this paper, the above properties are associated with the
                      proton dynamics in organic donor–acceptor systems. We
                      present the comparison of the physicochemical properties of
                      four molecular complexes containing the proton acceptor
                      molecule, 6,6′-dimethyl-2,2′-bipyridyl (66DMBP), and one
                      of three organic acid molecules belonging to the
                      benzoquinone group. As proton donor molecules the organic
                      acids: chloranilic, bromanilic and iodanilic acids have been
                      chosen. We present the results of experiments concerning the
                      determination of crystal structures, 1H NMR, inelastic
                      neutron scattering (INS) and UV/vis spectra. In the
                      theoretical part, we attempt to explain the influence of the
                      crystallization method (a type of solvent) on transoid or
                      cisoid arrangement of 66DMBP. In the theoretical approach,
                      we focus on two forms of the complex with chloranilic acid,
                      α-66DMBP·CLA and β-66DMBP·CLA, which undergo
                      solid-to-solid phase transitions, at 380 and 317 K,
                      respectively. We have chosen these examples because the α
                      analogue possesses ferroelectric properties in a wide range
                      of temperatures.},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000583363700007},
      doi          = {10.1039/D0CE00973C},
      url          = {https://juser.fz-juelich.de/record/885912},
}