有机溶剂对室温离子液体电学阻抗特性的影响

Influence of Organic Solvents on the Electric Impedance Characteristics of Room Temperature Ionic Liquids

建立了离子液体电学阻抗特性的测定方法,测定了乙醇、丙酮、乙酸乙酯、四氯化碳四种有机溶剂对溴代1-甲基-3-正己基咪唑、1-甲基-3-正己基咪唑四氟硼酸盐两种离子液体电导率和介电常数的影响.结果表明,两种离子液体吸收乙醇或丙酮后,它们的电导率和介电常数显著增加,而四氯化碳对两种液体的电学阻抗特性影响较小.研究离子液体的电学阻抗特性,有助于开拓离子液体在电化学领域的应用.

The electric impedance characteristics of a room temperature ionic liquid （RTIL） was measured in an impedance analysis method. The influence of an organic solvent on the conductivity and dielectric constant of an RTIL was investigated. The model solvents included ethanol, acetone, ethyl acetate and tetrachloromethane. And 1-hexyl-3-methylimidazolium bromide and 1-hexyl-3-methylimidazolium fluoroborate were used as the model RTIL. It was shown that the addition of ethanol or acetone to the two RTIL caused significant increases in the conductivity and dielectric constant of the mixtures of RTIL and organic solvent. However, the influence on the electronic impedance of the two RTILs was much less than that of acetone or ethanol. The investigation of the electronic impedance of RTILs is helpful to the application of RTILs in electrochemistry.