[(18-Crown-6)K][Fe(1)Cl(1)4 ]0.5 [Fe(2)Cl(2)4 ]0.5 : A Multifunctional Molecular Switch of Dielectric, Conductivity and Magnetic Properties.
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)4 ]0.5 [Fe(2)Cl(2)4 ]0.5 (1) by incorporating KCl and FeCl3 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 [FeCl4 ]- 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.
['Tong|Yuan-Bo|YB|http://orcid.org/0000-0003-1654-104X', 'Tian|Zheng-Fang|ZF|', 'Duan|Hai-Bao|HB|', 'Zhu|Zhong-Peng|ZP|', 'He|Wei|W|', 'Hong|Tian-Yu|TY|', 'Yu|Gui|G|', 'He|Yu-Jian|YJ|', 'Yang|Jing-Kui|JK|http://orcid.org/0000-0002-6568-9799']
crystal engineering heterometallic complexes organic-inorganic hybrid composites structure-phase transition supramolecular chemistry