% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Rok:858951,
      author       = {Rok, M. and Bator, G. and Medycki, W. and Zamponi, M. and
                      Balčiūnas, S. and Šimėnas, M. and Banys, J.},
      title        = {{R}eorientational dynamics of organic cations in
                      perovskite-like coordination polymers},
      journal      = {Dalton transactions},
      volume       = {47},
      number       = {48},
      issn         = {0300-9246},
      address      = {London},
      publisher    = {Soc.},
      reportid     = {FZJ-2018-07777},
      pages        = {17329 - 17341},
      year         = {2018},
      abstract     = {Here we report the dynamics of organic cations as guest
                      molecules in a perovskite host-framework. The molecular
                      motion of CH3NH3+ (MAFe), (CH3)2NH2+ (DMAFe) and (CH3)3NH+
                      (TrMAFe) in the cage formed by KFe(CN)63− units was
                      studied using a combination of experimental methods: (i)
                      thermal analysis, (ii) dielectric and electric studies,
                      (iii) optical observations, (iv) EPR and 1H NMR spectroscopy
                      and (v) quasielastic neutron scattering (QENS). In the case
                      of MAFe and TrMAFe, the thermal analysis reveals one
                      solid-to-solid phase transition (PT) and two PTs for the
                      DMAFe crystal. A markedly temperature-dependent dielectric
                      constant indicates the tunable and switchable properties of
                      the complexes. Also, their semiconducting properties are
                      confirmed by a dc conductivity measurement. The broadband
                      dielectric relaxation is analyzed for the TrMAFe sample in
                      the frequency range of 100 Hz–1 GHz. QENS shows that we
                      deal rather with the localized motion of the cation than a
                      diffusive one. Three models, which concern the simultaneous
                      rotation of the CH3 and/or NH3 group, π-flips and free
                      rotations of the organic cation, are used to fit the elastic
                      incoherent structure factor. The 1H NMR spin–lattice
                      relaxation time for all compounds under study, as well as
                      the second moments, has been measured in a wide temperature
                      range. In all studied samples, the temperature dependence of
                      the second moment of the proton NMR line indicated the
                      gradual evolution of the molecular movements from the rigid
                      state up to a highly disordered one},
      cin          = {JCNS-FRM-II / JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      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},
      pubmed       = {pmid:30475377},
      UT           = {WOS:000453550900014},
      doi          = {10.1039/C8DT03372B},
      url          = {https://juser.fz-juelich.de/record/858951},
}