咪唑醋酸盐的制备和物理化学性质及其水和乙醇溶液的电导率

咪唑醋酸盐的制备和物理化学性质及其水和乙醇溶液的电

导率

侯海云;黄银蓉;王升泽;白博峰

【期刊名称】《物理化学学报》 【年(卷),期】2011(027)011

【摘要】制备了离子液体1-甲基咪唑醋酸盐([Mim]Ac),1,3-二甲基咪唑醋酸盐([Mmim]Ac)和1-乙基-3-甲基咪唑醋酸盐([Emim]Ac),分别测定了它们在293.15-338.14 K间的密度、电导率和绝对粘度,计算了相应的摩尔电导率和运动粘度.用最小二乘法分别拟合建立了密度、电导率、摩尔电导率、绝对粘度和运动粘度与温度的函数关系.讨论了咪唑环3位氮原子上烷基链长对以上咪唑醋酸盐五种物理化学性质的影响.在293.15 K测定了[Mim]Ac{或[Mmim]Ac,[Emim]Ac}(1)-H2O(或EtOH) (2)二元溶液在全浓度范围内的电导率,计算了对应的咪唑醋酸盐的摩尔电导率.发现无论是水溶液还是乙醇溶液,溶液的电导率和咪唑醋酸盐的摩尔电导率都随着浓度的增加先增大而后减小.同一浓度下,咪唑环3位氮原子上烷基链长增加,相应的溶液电导率和摩尔电导率下降.且水溶液的电导率和摩尔电导率远大于乙醇溶液的.%The ionic liquids 1-methylimidazolium acetate ([MimJAc), 1,3-dimethylimidazolium acetate ([MmimJAc), and 1-ethyl-3-methylimidazolium acetate ([EmimJAc) were prepared and their densities, conductivities, and absolute viscosities were measured at temperatures ranging from 293.15 to 338.14 K. Their corresponding molar conductivities and kinematic viscosities were also calculated. The dependence of densities, conductivities, molar