Charge Transfer Induced Multifunctional Transitions with Sensitive Pressure Manipulation in a Metal鈥揙rganic Framework

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• 作者：Junye Yang ; Long Zhou ; Jinguang Cheng ; Zhiwei Hu ; Changyang Kuo ; Chih-Wen Pao ; Lingyun Jang ; Jyh-Fu Lee ; Jianhong Dai ; Sijia Zhang ; Shaomin Feng ; Panpan Kong ; Zhen Yuan ; Jie Yuan ; Yoshiya Uwatoko ; Tao Liu ; Changqing Jin ; Youwen Long
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：July 6, 2015
• 年：2015
• 卷：54
• 期：13
• 页码：6433-6438
• 全文大小：415K
• ISSN：1520-510X

文摘

The metal鈥搊rganic framework {[Fe(2,2鈥?bipyridine)(CN)₄]₂Co(4,4鈥?bipyridine)}路4H₂O (Fe₂Co-MOF) with single-chain magnetism undergoes an intermetallic charge transfer that converts the Fe₂Co charge/spin configurations from Fe³⁺_LS鈥揅o²⁺_HS鈥揊e³⁺_LS to Fe²⁺_LS鈥揅o³⁺_LS鈥揊e³⁺_LS (LS = low spin, HS = high spin) around 220 K under ambient pressure. A series of coherent phase transitions in structure, magnetism, permittivity and ferroelectricity are found to take place accompanying with the charge transfer, making Fe₂Co-MOF a unique ferroelectric single-chain magnet at low temperature. Moreover, our detailed measurements of magnetization, dielectric constant, and Raman scattering under high pressures illustrate that the charge transfer as well as the resulting multifunctional transitions can be readily induced to occur at room temperature by applying a tiny external pressure of about 0.5 kbar. The present study thus provides a pressure well-controllable multifunctional material with potential applications in a broad temperature region across room temperature.