Raman Investigation of the Ionic Liquid N-Methyl-N-propylpyrrolidinium Bis(trifluoromethanesulfonyl)imide and Its Mixture with LiN(SO2CF3)2

Abstract

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.