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Switchable molecular ferroelectric compound

Research Project

Project/Area Number 25620046
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Inorganic chemistry
Research InstitutionKyushu University

Principal Investigator

SATO Osamu  九州大学, 先導物質化学研究所, 教授 (80270693)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords誘電特性 / 強誘電 / 金属錯体
Outline of Final Research Achievements

A pure organic single crystal [H2dabco][2CB]2 ([H2dabco]2+ = diprotonated 1,4-diazabicyclo[2.2.2]octane, 2CB- = 2-chlorobenzoate), which exhibits ferroelectricity above room temperature, was synthesized. The crystal is constructed from trimer units in which two 2CBanions are bridged by one diprotonated [H2dabco]2+ cation. The [H2dabco]2+ cation undergoes an order-disorder phase transition above room temperature. In the high temperature phase, the [H2dabco]2+ cation located at the middle position of the trimer is rotated with disorder about its N--N axis and lies at the center of inversion. When the temperature drops below the phase transition temperature, the [H2dabco]2+ cation is frozen such that it is ordered and deviates from the center of the trimer unit. This displacement of the cation leads to symmetry breaking (nonpolar space group Pbca to polar space group Pna21) and generates a spontaneous polarization along the crystallographic c axis.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (4 results)

All 2015 2014 Other

All Presentation (4 results)

  • [Presentation] 機能性異核複核錯体分子の新規合成法と電子物性研究2015

    • Author(s)
      金川慎治、姜 舜徹、佐藤治
    • Organizer
      日本化学会
    • Place of Presentation
      千葉
    • Year and Date
      2015-03-26
    • Related Report
      2014 Annual Research Report
  • [Presentation] キラリティを利用した機能性複核錯体分子の合成と電子物性2014

    • Author(s)
      金川慎治、姜 舜徹、佐藤治
    • Organizer
      錯体化学討論会
    • Place of Presentation
      東京
    • Year and Date
      2014-09-19
    • Related Report
      2014 Annual Research Report
  • [Presentation] キラル配位子を用いた複核錯体の構造及び磁気物性の制御

    • Author(s)
      金川慎治、楢崎優、姜舜徹、佐藤治
    • Organizer
      日本化学会
    • Place of Presentation
      名古屋大学
    • Related Report
      2013 Research-status Report
  • [Presentation] 原子価互変異性コバルト複核錯体の光磁性スイッチング

    • Author(s)
      金川慎治、楢崎優、姜舜徹、佐藤治
    • Organizer
      光化学討論会
    • Place of Presentation
      愛媛大
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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