Zheng Hui, Meng Yin-Shan, Zhou Guang-Li, Duan Chun-Ying, Sato Osamu, Hayami Shinya, Luo Yi, Liu Tao
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2. Linggong Rd., 116024, Dalian, China.
Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga, 816-8580, Fukuoka, Japan.
Angew Chem Int Ed Engl. 2018 Jul 9;57(28):8468-8472. doi: 10.1002/anie.201802774. Epub 2018 Jun 14.
Magnetic and dielectric properties have been tuned simultaneously by external stimuli with rapid and sensitive response, which is crucial to monitor the magnetic state via capacitive measurement. Herein, positive charged Fe ions were linked via negative charged [(Tp)Fe (CN) ] (Tp=hydrotris(pyrazolyl)borate) units to form a neutral chain. The spin-crossover (SCO) on Fe sites could be sensitively triggered via thermal treatment, light irradiation, and pressure. SCO switched the spin state of the Fe ions and antiferromagnetic interactions between Fe and Fe ions, resulting in significant change in magnetization. Moreover, SCO induced rotation of negative charged [(Tp)Fe (CN) ] units, generating dielectric anomaly due to geometric change of charges distribution. This work provides a rational way to manipulate simultaneous variations in magnetic and dielectric properties utilizing SCO as an actuator to tune spin arrangement, magnetic coupling, and charge distribution.
通过外部刺激可同时调节磁性和介电性能，且响应快速灵敏，这对于通过电容测量监测磁态至关重要。在此，带正电荷的铁离子通过带负电荷的[(Tp)Fe(CN)]（Tp = 氢三(吡唑基)硼酸酯）单元相连形成中性链。铁位点上的自旋交叉（SCO）可通过热处理、光照射和压力灵敏触发。SCO改变了铁离子的自旋状态以及铁离子之间的反铁磁相互作用，导致磁化强度发生显著变化。此外，SCO诱导带负电荷的[(Tp)Fe(CN)]单元旋转，由于电荷分布的几何变化产生介电异常。这项工作提供了一种合理的方法，利用SCO作为调节自旋排列、磁耦合和电荷分布的驱动器来操纵磁性和介电性能的同时变化。
