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

被引:33
作者
Yao, Zi-Shuo [1 ,2 ]
Wu, Shu-Qi [1 ,2 ]
Kitagawa, Yasutaka [3 ]
Su, Sheng-Qun [1 ,2 ]
Huang, You-Gui [1 ,2 ]
Li, Guo-Ling [1 ,2 ]
Ni, Zhong-Hai [4 ]
Nojiri, Hiroyuki [5 ]
Shiota, Yoshihito [1 ,2 ]
Yoshizawa, Kazunari [1 ,2 ]
Kang, Soonchul [1 ,2 ]
Kanegawa, Shinji [1 ,2 ]
Sato, Osamu [1 ,2 ]
机构
[1] Kyushu Univ, Inst Mat Chem & Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
[2] Kyushu Univ, IRCCS, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
[3] Osaka Univ, Grad Sch Engn Sci, Dept Mat Engn Sci, Div Chem Engn, 1-3,Machikaneyama, Toyonaka, Osaka 5608531, Japan
[4] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China
[5] Tohoku Univ, Inst Mat Res, Katahira 2-1-1, Sendai, Miyagi 9808577, Japan
关键词
cobalt; magnetic switching; phase transitions; shape change; symmetry breaking; MOLECULE MAGNET; PHASE-TRANSITION; SPIN-TRANSITION; BEHAVIOR; BISTABILITY; RELAXATION; CYANIDE; ORIGIN; ABRUPT; STATE;
D O I
10.1002/anie.201606165
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 908 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.
引用
收藏
页码:717 / 721
页数:5
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