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Anisotropic Change in the Magnetic Susceptibility of a Dynamic Single Crystal of a Cobalt(II) Complex
Author(s) -
Yao ZiShuo,
Wu ShuQi,
Kitagawa Yasutaka,
Su ShengQun,
Huang YouGui,
Li GuoLing,
Ni ZhongHai,
Nojiri Hiroyuki,
Shiota Yoshihito,
Yoshizawa Kazunari,
Kang Soonchul,
Kanegawa Shinji,
Sato Osamu
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201606165
Subject(s) - anisotropy , magnetic susceptibility , condensed matter physics , chemistry , ion , magnetic anisotropy , oxalate , cobalt , crystal (programming language) , single crystal , symmetry (geometry) , crystallography , rotation (mathematics) , phase transition , magnetic field , materials science , physics , magnetization , geometry , inorganic chemistry , optics , programming language , organic chemistry , quantum mechanics , computer science , mathematics
Atypically anisotropic and large changes in magnetic susceptibility, along with a change in crystalline shape, were observed in a Co II complex at near room temperature. This was achieved by combining oxalate molecules, acting as rotor, and a Co II ion 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 Co II ion, 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 D 3 coordination environment of the complex cation.