冠醚-咪唑型铁基超分子材料的合成、结构及电学性能

Synthesis,Structure and Electrical Properties of Crown Ether-Imidazole Type Iron-Based Supramolecular Materials

以咪唑、三氯化铁和二苯并-18-冠醚-6为原料,通过自然蒸发法在乙腈溶剂中获得了一种有机-无机杂化超分子材料(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)。通过红外光谱、单晶X-射线衍射、粉末X-射线衍射、热重分析、介电常数和电化学等对其结构和性能进行表征。结果显示,(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)在低温(100 K)和室温(293 K)的空间群为Ia,属于单斜晶系,在空间结构内超分子阳离子(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)与阴离子(FeCl_(4))^(-)以N-H…O、C-H…O、C-H…Cl等氢键相互作用形成二维网状超分子结构。介电测试显示(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)在升温和降温的过程中均在160~200 K和220~260 K产生两个阶梯型介电异常峰,其循环伏安测试表明(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)具有明显的电子转移性能,显示(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)是一种新型的介电异常及电化学性能材料。

This research aims to obtain a novel organic-inorganic hybrid supramolecular material(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)by natural evaporation method in acetonitrile solvent using imidazole,ferric chloride and dibenzo-18-crown-6 as raw materials.Its structure and properties were characterized by infrared spectroscopy,single crystal X-ray diffraction,powder X-ray diffraction,dielectric constant thermogravimetric and electrochemistry analysis.The results of single crystal X-ray diffraction showed that the space group of(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)at low temperature(100 K)and room temperature(293 K)was Ia,which belonged to monoclinic system.In the space structure,the supramolecular cation(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)and the anion(FeCl_(4))^(-)formed a two-dimensional network supramolecular structure by hydrogen-bonding interactions such as N-H…O,C-H…O,C-H…Cl.The dielectric test showed that(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)produced two stepped dielectric anomaly peaks in the temperature range of 160-200 K and 220-260 K during heating and cooling processes.The cyclic voltammetry test showed that(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)had good electron transfer performance,indicating that(C_(3)H_(5)N_(2))^(+)(DB-18-Crown-6)(FeCl_(4))^(-)was a new type of dielectric anomaly and electrochemical performance material.