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合成了一种非对称双阳离子型离子液体1-(吡啶鎓基)-6-(3-甲基咪唑鎓)己烷六氟磷酸盐,进行了IR和1H-NMR表征。利用热重分析法(TG),测定了高纯氮气气氛下该离子液体的热稳定性,其初始分解温度为601.15K。通过差示扫描量热仪(DSC)测定了该离子液体在温度区间313.15-543.15K的热容,得到了熔点,相变焓和相变熵。通过对固相区和液相区的热容数据进行多项式拟合,得到了以298.15K为参考温度的热力学方程。
An asymmetric bis-cationic ionic liquid 1- (pyridinium) -6- (3-methylimidazolium) hexafluorophosphate was synthesized and characterized by IR and 1H-NMR. Thermogravimetric analysis (TG) was used to determine the thermal stability of the ionic liquid under high purity nitrogen atmosphere. The initial decomposition temperature was 601.15K. The heat capacity of the ionic liquid at 313.15-543.15K was measured by differential scanning calorimeter (DSC), and the melting point, enthalpy of phase transition and entropy of phase transformation were obtained. The thermodynamic equation with reference temperature of 298.15K was obtained by polynomial fitting of the heat capacity data of the solid and liquid regions.