Macroscopic Polarization Change of Mononuclear Valence Tautomeric Cobalt Complexes Through the Use of Enantiopure Ligand

Feng Cheng, Shuqi Wu, Wenwei Zheng, Shengqun Su, Takumi Nakanishi, Wenhuang Xu, Pritam Sadhukhan, Hibiki Sejima, Shimon Ikenaga, Kaoru Yamamoto, Kaige Gao, Shinji Kanegawa, Osamu Sato

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The crystallization of a complex having electron transfer properties in a polar space group can induce the polarization switching of a crystal in a specific direction, which is attractive for the development of sensors, memory devices, and capacitors. Unfortunately, the probability of crystallization in a polar space group is usually low. Noticing that enantiopure compounds crystallize in Sohncke space groups, this paper reports a strategy for the molecular design of non-ferroelectric polarization switching crystals based on the use of intramolecular electron transfer and chirality. In addition, this paper describes the synthesis of a mononuclear valence tautomeric (VT) cobalt complex bearing an enantiopure ligand. The introduction of enantiomer enables the crystallization of the complex in the polar space group (P21). The polarization of the crystals along the b-axis direction is not canceled out and the VT transition is accompanied by a change in the macroscopic polarization of the polar crystal. Polarization switching via electron transfer is realized at around room temperature.

Original languageEnglish
JournalChemistry - A European Journal
Publication statusAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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