Synthesis, Characterization, and Physicochemical Properties of New [Emim][BF₃X] Complex Anion Ionic Liquids

Abstract

A new series of complex anion ionic liquids (ILs) [Emim][BF 3 X] (X = CH 3 SO 3 , EtSO 4 , HSO 4 , Tosylate) were synthesized and characterized by nuclear magnetic resonance, elemental analysis, differential scanning calorimetry analysis, and thermogravimetry. The physicochemical properties of these ILs, such as density, viscosity, conductivity, and surface tension, were measured and correlated with thermodynamic and empirical equations in the temperature range of 293.15− 358.15 K under ambient conditions, and the thermal expansion coefficient, standard molar entropy, lattice potential energy, viscosity activation energy, surface enthalpy, and surface entropy were further calculated from experimental values. According to the temperature-dependent viscosity and conductivity, [Emim][BF 3 X] ILs follow the Walden rule, and they are classified as "good (or super) ionic liquids".

BF3 Complexing Phosphate/Phosphonate Ionic Liquids: Synthesis, Characterization and Thermophysical Properties

“…[14] A series of BF 3 complexing alkylsulfonate/alkylsulphate ionic liquids [Emim][BF 3 X] (X = methanesulfonate, ethylsulfate, hydrogen sulfate, and tosylate) have been successfully synthesized and characterized in the laboratory. [15] Compared to the corresponding alkylsulfonate/alkylsulphate ILs, new complex ILs have a significantly lower glass-transition temperature, lower viscosity, higher density and greater conductivity. As part of our interest in exploring new Lewis fluoroacids complex anion ILs, we report here the synthesis and characterization of a series of BF 3 complexing phosphate/phosphonate ionic liquids, and several important thermophysical properties were measured and compared with the corresponding phosphate/phosphonate ILs.…”