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Angewandte Chemie v.130 no.29, 2018년, pp.9182 - 9185  

Room‐Temperature Ferroelectricity in an Organic Cocrystal

Wiscons, Ren A. (Department of Chemistry and the Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109-1055, USA ) ; Goud, N. Rajesh (Department of Chemistry and the Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109-1055, USA ) ; Damron, Joshua T. (Department of Chemistry and the Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109-1055, USA ) ; Matzger, Adam J. (Department of Chemistry and the Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109-1055, USA ) ;
  • 초록  

    Abstract Ferroelectric materials exhibit switchable remanent polarization due to reversible symmetry breaking under an applied electric field. Previous research has leveraged temperature‐induced neutral‐ionic transitions in charge‐transfer (CT) cocrystals to access ferroelectrics that operate through displacement of molecules under an applied field. However, displacive ferroelectric behavior is rare in organic CT cocrystals and achieving a Curie temperature ( T C ) above ambient has been elusive. Here a cocrystal between acenaphthene and 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane is presented that shows switchable remanent polarization at room temperature ( T C = 68 °C). Raman spectroscopy, X‐ray diffraction, and solid‐state NMR spectroscopy indicate the ferroelectric behavior is facilitated by acenaphthene (AN) rotation, deviating from conventional design strategies for CT ferroelectrics. These findings highlight the relevance of non‐CT interactions in the design of displacive ferroelectric cocrystals.


  • 주제어

    Ferroelektrika .   Kristall-Engineering .   Ladungstransfer .   Organische Elektronik .   Polarisierung.  

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