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Macroscopic Polarization Change via Electron Transfer in a Valence Tautomeric Cobalt Complex

Author

Listed:
  • Shu-Qi Wu

    (Kyushu University)

  • Meijiao Liu

    (Kyushu University
    Tsinghua University)

  • Kaige Gao

    (Kyushu University
    Yangzhou University)

  • Shinji Kanegawa

    (Kyushu University)

  • Yusuke Horie

    (Aoyama Gakuin University)

  • Genki Aoyama

    (Aoyama Gakuin University)

  • Hajime Okajima

    (Aoyama Gakuin University)

  • Akira Sakamoto

    (Aoyama Gakuin University)

  • Michael L. Baker

    (The University of Manchester
    The University of Manchester at Harwell)

  • Myron S. Huzan

    (The University of Manchester
    The University of Manchester at Harwell)

  • Peter Bencok

    (Diamond Light Source)

  • Tsukasa Abe

    (Kyushu University)

  • Yoshihito Shiota

    (Kyushu University)

  • Kazunari Yoshizawa

    (Kyushu University)

  • Wenhuang Xu

    (Kyushu University)

  • Hui-Zhong Kou

    (Tsinghua University)

  • Osamu Sato

    (Kyushu University)

Abstract

Polarization change induced by directional electron transfer attracts considerable attention owing to its fast switching rate and potential light control. Here, we investigate electronic pyroelectricity in the crystal of a mononuclear complex, [Co(phendiox)(rac-cth)](ClO4)·0.5EtOH (1·0.5EtOH, H2phendiox = 9, 10-dihydroxyphenanthrene, rac-cth = racemic 5, 5, 7, 12, 12, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradecane), which undergoes a two-step valence tautomerism (VT). Correspondingly, pyroelectric current exhibits double peaks in the same temperature domain with the polarization change consistent with the change in dipole moments during the VT process. Time-resolved Infrared (IR) spectroscopy shows that the photo-induced metastable state can be generated within 150 ps at 190 K. Such state can be trapped for tens of minutes at 7 K, showing that photo-induced polarization change can be realized in this system. These results directly demonstrate that a change in the molecular dipole moments induced by intramolecular electron transfer can introduce a macroscopic polarization change in VT compounds.

Suggested Citation

  • Shu-Qi Wu & Meijiao Liu & Kaige Gao & Shinji Kanegawa & Yusuke Horie & Genki Aoyama & Hajime Okajima & Akira Sakamoto & Michael L. Baker & Myron S. Huzan & Peter Bencok & Tsukasa Abe & Yoshihito Shiot, 2020. "Macroscopic Polarization Change via Electron Transfer in a Valence Tautomeric Cobalt Complex," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15988-1
    DOI: 10.1038/s41467-020-15988-1
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