[Bmim]PF_6在甲醇和乙腈中的电导率和黏度研究

Study on the conductivity and viscosity of [Bmim]PF_6 in methanol or acetonitrile

测定了298.15K条件下1-丁基-3-甲基咪唑六氟磷酸盐离子液体([Bmim]PF_6)在甲醇和乙腈中的电导率和黏度,讨论了[Bmim]PF_6/甲醇和[Bmim]PF_6/乙腈体系的溶液性质。结果表明,在0～0.3mol/L的浓度范围内,[Bmim]PF_6/甲醇和[Bmim]PF_6/乙腈体系的电导率随[Bmim]PF_6浓度的增加而增加,并且[Bmim]PF_6在甲醇中的电导率高于在乙腈中的电导率,说明[Bmim]PF_6在甲醇中更容易电离;[Bmim]PF_6/甲醇和[Bmim]PF_6/乙腈体系的摩尔电导率随浓度的增加而降低,采用Kohlrausch公式计算回归了[Bmim]PF_6在甲醇以及乙腈中的无限稀释摩尔电导率(∧_m^w),其值分别为156.96和153.83s·cm^2·mol^(-1)。由Jones-Dole方程计算回归了[Bmim]PF_6在甲醇和乙腈中黏度B系数,其值分别为0.36813和0.63248,表明[Bmim]PF_6在甲醇中的黏度小于在乙腈中的黏度,这与电导率实验的结果是一致的。

Conductivity and viscosity data for ionic liquids l-butyl-3-methyl imidazolium hexafluorophosphate （[Bmim]PF_6） in methanol and acetonitrile at 298.15 K were determined.The solution properties of[Bmim]PF_6/ methanol and[Bmim]PF_6 /acetonitrile mixtures were discussed.The results show that the conductivity of [Bmim]PF_6/methanol and[Bmim]PF_6/acetonitrile mixtures increased as the concentration of[Bmim]PF_6 increased within 0~0.3mol/L.The conductivity for[Bmim]PF_6 in methanol was higher than that in acetonitrile, which indicated the[Bmim]PF_6 was more easily ionized in methanol than that in acetonitrile.The mole conductivity decreased as the concentration increased,the A_m^w of[Bmim]PF_6/methanol and[Bmim]PF_6/acetonitrile mixtures were calculated by regression through Kohlrausch equation,and value were 156.96 and 153.83 s ？ cm^2 ？ mol^（-1）,respectively.The viscosity B coefficient of[Bmim]PF_6/methanol and[Bmim]PF_6/acetonitrile mixtures were calculated by regression through Jones-Dole equation,and value were 0.36813 and 0.63248,respectively, which were consistent with the conductivity results.