Tong Yuan-Bo, Tian Zheng-Fang, Duan Hai-Bao, Zhu Zhong-Peng, He Wei, Hong Tian-Yu, Yu Gui, He Yu-Jian, Yang Jing-Kui
School of Chemical Sciences, University of Chinese Academy of Sciences., Beijing, 100049, P. R. China.
Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, Hu Bei Province, 438000, P. R. China.
Chem Asian J. 2018 Mar 16;13(6):656-663. doi: 10.1002/asia.201701794. Epub 2018 Feb 19.
Multifunctional materials that exhibit different physical properties in a single phase have potential for use in multifunctional devices. Herein, we reported an organic-inorganic hybrid compound [(18-crown-6)K][Fe(1)Cl(1) ] [Fe(2)Cl(2) ] (1) by incorporating KCl and FeCl into a 18-crown-6 molecule, which acts as a host of the six O atoms providing a lone pair of electrons to anchor the guest potassium cation, and [FeCl ] as a counterion for charge balance to construct a complex salt. This salt exhibited a one-step reversible structural transformation giving two separate high and low temperature phases at 373 K, which was confirmed by systematic characterizations including differential scanning calorimetry (DSC) measurements, variable-temperature structural analyses, and dielectric, impedance, variable-temperature magnetic susceptibility measurements. Interestingly, the structural transformation was coupled to both hysteretic dielectric phase transition, conductivity switch and magnetic-phase transition at 373 K. This result gives an idea for designing a new type of phase-transition materials harboring technologically important magnetic, conductivity and dielectric properties.
在单相中呈现不同物理性质的多功能材料在多功能器件中具有应用潜力。在此，我们通过将氯化钾和氯化铁掺入18-冠-6分子中，报道了一种有机-无机杂化化合物[(18-冠-6)K][Fe(1)Cl(1) ][Fe(2)Cl(2) ] (1)，18-冠-6分子作为主体，其六个氧原子提供孤对电子以锚定客体钾阳离子，而[FeCl ]作为抗衡离子用于电荷平衡以构建复盐。该盐在373 K时呈现一步可逆结构转变，产生两个独立的高温相和低温相，这通过包括差示扫描量热法(DSC)测量、变温结构分析以及介电、阻抗、变温磁化率测量在内的系统表征得以证实。有趣的是，该结构转变在373 K时与滞后介电相变、电导率开关和磁相变均相关联。这一结果为设计一种具有技术上重要的磁性、电导率和介电性质的新型相变材料提供了思路。
