Anisotropic Change in the Magnetic Susceptibility of a Dynamic Single Crystal of a Cobalt (II) Complex
Anisotropic Change in the Magnetic Susceptibility of a Dynamic Single Crystal of a Cobalt (II) Complex
复制标题
钴（II）配合物动态单晶磁化率的各向异性变化
DOI：
10.1002/ange.201606165
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发表时间：
2017
影响因子：
--
通讯作者：
Osamu Sato
中科院分区：
文献类型：
--
作者：
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
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 idealD3coordination environment of the complex cation.
