Raman investigation of the ionic liquid N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and its mixture with LiN(SO2CF3)2.

A preliminary Raman investigation of the ionic liquid N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR13TFSI) and its 2/1 complex with the lithium salt LiN(SO2CF3)2 is reported. The study was performed over a temperature range extending from −100 to +60 °C, i.e., with PYR13TFSI in the crystalline and melt states. For comparison purposes, the study was extended to PYR13I, which is the precursor used in the synthesis of PYR13TFSI.