Anisotropic Change in the Magnetic Susceptibility of a Dynamic Single Crystal of a Cobalt(II) Complex

Zi Shuo Yao, Shu Qi Wu, Yasutaka Kitagawa, Sheng Qun Su, You Gui Huang, Guo Ling Li, Zhong Hai Ni, Hiroyuki Nojiri, Yoshihito Shiota, Kazunari Yoshizawa, Soonchul Kang, Shinji Kanegawa, Osamu Sato

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Atypically anisotropic and large changes in magnetic susceptibility, along with a change in crystalline shape, were observed in a CoIIcomplex at near room temperature. This was achieved by combining oxalate molecules, acting as rotor, and a CoIIion with unquenched orbital angular momentum. A thermally controlled 90° rotation of the oxalate counter anion triggered a symmetry-breaking ferroelastic phase transition, accompanied by contraction–expansion behavior (ca. 4.5 %) along the long axis of a rod-like single crystal. The molecular rotation induced a minute variation in the coordination geometry around the CoIIion, resulting in an abrupt decrease and a remarkable increase in magnetic susceptibility along the direction perpendicular and parallel to the long axis of the crystal, respectively. Theoretical calculations suggested that such an unusual anisotropic change in magnetic susceptibility was due to a substantial reorientation of magnetic anisotropy induced by slight disruption in the ideal D3coordination environment of the complex cation.

Original languageEnglish
Pages (from-to)717-721
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number3
Publication statusPublished - 2017 Jan 16


  • cobalt
  • magnetic switching
  • phase transitions
  • shape change
  • symmetry breaking


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