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| Synthesis, Phase Transition and Dielectric Properties of Ferrate Cyanogen(Ⅲ) Hydrogen-Bonding Supramolecular Crystal |
| Author Name | Affiliation | E-mail | | ZHENG Xiao-Yuan | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | | | LIU Yang | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | liuyangxj85@163.com | | LIU Yi | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | | | QIN Liu-Lei | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | | | WANG Le | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | | | LIU Zun-Qi | Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China | zunqi85@163.com |
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| Abstract: Synthesis of novel ferric cyanide hydrogen-bonding cage-like supramolecular crystal material (C3H5N2)3[Fe(CN)6]·2(18-crown-6)·2H2O (1) by solvent evaporation in methanol solution with imidazole, 18-crown-6 and ferric cyanide. The structure, thermal energy and electrical properties of the crystal were characterized by variable temperature X-ray diffraction single crystal diffraction, infrared spectroscopy, elemental analysis, thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and dielectric constant test. The space group of the crystal is P21/c, which belongs to the monoclinic system at low temperatures. The crystal structure shows that the cyano-iron complex, the water molecule and the imidazolium cation form a three-dimensional cage structure with iron atoms as the apex in the form of hydrogen bonds. This resulted in phase transition at around 250 K and stepped reversible dielectric anomalies in a range of 220~260 K. Temperature variation triggers the cage structure abrupt change, and at the same time causes dynamic oscillation of supramolecules within the framework of[Fe(CN)6]3-, thus induces the phase transition of crystal structure. The phase transition temperature interval of the crystal structure was accompanied with step-like change in dielectric physical properties. The dielectric constant was reversible and changed from 38 to 43 with temperature increasing from 220 to 280 K. Above 270 K, the sudden jump in dielectric is caused by water vapor. |
| Keywords: metal-organic framework crystal structure hydrogen bond dielectric properties |
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| ZHENG Xiao-Yuan,LIU Yang,LIU Yi,QIN Liu-Lei,WANG Le,LIU Zun-Qi.Synthesis, Phase Transition and Dielectric Properties of Ferrate Cyanogen(Ⅲ) Hydrogen-Bonding Supramolecular Crystal[J].Chinese Journal of Inorganic Chemistry,2020,36(3):406-414. |
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