A new fluorinated anion for room-temperature ionic liquids

A new room-temperature ionic liquid (RTIL) consisting of the fluorinated anion bis(trifluoromethyl)-phosphinate((CF3)2PO2−) coupled with the 1-butyl-3-methyl-imidazoliuim (BMIM) cation has been synthesized and characterized by physicochemical and electrochemical means including differential scanning calorimetry (DSC), thermogravimetric analysis, viscosity, conductivity and cyclic voltammetry measurements. Properties are compared with those of the known RTIL consisting of BMIM coupled with the bis(trifluoromethyl)-sulfonylimide (TFSI) anion.

Figure optionsDownload as PowerPoint slideResearch highlights▶ A room-temperature ionic liquid of structure methyl-butyl-imidazolium bis(trifluoromethyl)phosphinate was synthesized and characterized.▶ The material is liquid over a wide temperature range.▶ Ionic conductivity, viscosity, and voltage window are suitable for electrochemical device applications.