Raman Spectroscopic Studies and Ab Initio Calculations on Conformational Isomerism of 1-Butyl-3-methylimidazolium Bis-(trifluoromethanesulfonyl)amide Solvated to a Lithium Ion in Ionic Liquids: Effects of the Second Solvation Sphere of the Lithium Ion

摘要

Raman spectra of the ionic liquid, l-butyl-3-mefhylimidazolium bis-(trifluoromethanesulfonyl)amide [G4mIm][TFSA] containing a LiTFSA salt were measured for the lithium salt mole fractions x_(1.1) = 0.000, 0.053, 0.106, and 0.171 in the temperature range of 273—350 K. The lithium ion solvation number of 2 at ambient temperature is kept constant in higher temperatures examined in this study.