Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Ionic liquid consists of an organic cation and generally an inorganic anion. The properties of liquids can be modulated by changing the anion or the cation or both. Two ionic liquids derived from the anion [FSI] were synthetized and characterized: (N-n-butyl-N-methylpyrrolidinium bis(fluorosulfonyl imide), [BMPYR][FSI]) and triethyl-n-pentylphosphonium bis(fluorosulfonyl)imide), [P2225][FSI]). We also report the comparison with [TFSI] based ionic liquids namely: (N-n-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide), [BMPYR][TFSI]), (N-n-butyl-N-methylpiperidinium bis(trifluoromethylsulfonyl)imide), [BMP][TFSI]), triethyl-n-pentylphosphonium bis(trifluoromethylsulfonyl)imide), [P2225][TFSI]) and (triethyl (2- methoxyethyl) phosphonium bis(trifluoromethylsulfonyl imide), [P222201][TFSI]. Thermophysical properties, such as viscosity (298.15 to 373.15 K), density (298.15 to 373.15 K), conductivity (298.15 to 361.15 K), electrochemical (cut off density current within 150 iA*cm-2) and thermal stability (303.15 to 973.15 K) were experimentally determined. The results showed that [FSI] derivatives exhibit better transport properties and lower thermal and electrochemically stability when compared with their [TFSI] counterparts.