Structural assignment of polarization in hydrogen-bonded supramolecular ferroelectrics

Reiji Kumai, Sachio Horiuchi, Hajime Sagayama, Taka Hisa Arima, Masashi Watanabe, Yukio Noda, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


A 1:1 adduct of phenazine (Phz) with chloranilic acid (H2ca) and bromanilic acid (H2ba), in which nonpolar neutral molecules are connected by the intermolecular O-H⋯N hydrogen bonds, shows ferroelectric transitions. Neutron diffraction analysis of these materials reveals that there are two inequivalent hydrogen-bonding sites below the ferroelectric transition temperature (253 K for Phz-H2ca and 168 K for Phz-H2ba). This asymmetry was also observed by the maximum entropy method (MEM) analysis of the synchrotron X-ray diffractions. The structure analysis results suggest that the origin of the polarization of the material is the symmetry breaking based on the two inequivalent hydrogen bonds.

Original languageEnglish
Pages (from-to)12920-12921
Number of pages2
JournalJournal of the American Chemical Society
Issue number43
Publication statusPublished - 2007 Oct 31

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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