2018 Volume 86 Issue 2 Pages 92-98
An ionic liquid system based on two amide anions; bis(fluorosulfonyl)amide anion (FSA−) and bis(trifluoromethanesulfonyl)amide anion (TFSA−), with a quaternary ammonium cation; N,N,N-trimethyl-N-propylammonium cation (TMPA+), was investigated over entire composition range. The system showed the binary phase diagram and the eutectic point was 5.5°C around the anion ratio of 1:2 (FSA−: TFSA−). Polymorphic behavior of solidified ionic liquid was observed by X-ray diffraction (XRD) and discussed comparing with ionic liquids composed of other anion; (fluorosulfonyl) (trifluoromethylslufonyl)amide anion (FTA−) or tetrafluoroborate anion (BF4−). In addition, the phase diagram of the ionic liquid system containing lithium cation with binary anion was confirmed. Raman spectroscopy suggested that lithium cation interacts more preferentially with TFSA− than FSA−.
