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.

Raman spectra of the ionic liquid, 1-butyl-3-methylimidazolium bis-(trifluoromethanesulfonyl)amide [C(4)mIm][TFSA] containing a LiTFSA salt were measured for the lithium salt mole fractions x(Li) = 0.000, 0.053, 0.