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制备了吡啶类离子液体N-己基吡啶二氰胺盐[C_6py][DCA],并用核磁共振氢谱(~1H NMR)、核磁共振碳谱(~(13)C NMR)、差热扫描量热(DSC)、傅里叶变换红外(FT-IR)光谱对其进行表征。在288.15–338.15 K温度范围内,采用标准加入法,测定其密度(ρ)、表面张力(γ)和折光率(n_D)。在测得的实验数据的基础上,得到了离子液体[C_6py][DCA]的分子体积(V_m)、表面能(E_a)、摩尔极化度(R_m)和极化率(α_p)。结果显示E_a、R_m和α_p几乎不随温度的变化而发生改变。本文还提出了摩尔表面Gibbs自由能(g_s)的概念,并改进了E?tv?s方程。同时还计算了gs、临界温度(T_c)和E?tv?s方程经验参数(kE),并预测了离子液体[C_6py][DCA]的表面张力,预测值与实验值具有较好的一致性。
The pyridinium ionic liquid N-hexylpyridinium dicyanamide salt [C_6py] [DCA] was prepared and characterized by 1H nuclear magnetic resonance (1H NMR), nuclear magnetic resonance (~ 13 C NMR), differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR) spectroscopy. The density (ρ), surface tension (γ) and refractive index (n_D) were determined using the standard addition method in the temperature range of 288.15-338.15 K. Based on the experimental data obtained, the molecular volume (V_m), surface energy (E_a), molar polarization (R_m) and polarizability (α_p) of [C_6py] [DCA] were obtained. The results show that E_a, R_m and α_p change little with temperature. The concept of Gibbs free energy (g_s) on the Mohr surface is also proposed and the E? Tv? S equation is improved. At the same time, the empirical parameters (kE) of gs, critical temperature (T_c) and E? Tv? S equations were also calculated and the surface tension of [C_6py] [DCA] ionic liquid was predicted. The predicted values were in good agreement with the experimental values .