In this study, two ionic liquids containing the bis(trifluoromethanesulfonyl)imide ([(CF₃SO₂)₂N−]) anion are synthesized. The syntheses are based on an alkylation reaction of 1-methyl imidazole and 1,2-dimethyl imidazole followed by anion exchange. The obtained ILs are characterized by ¹H-NMR, ¹³C-NMR, ¹⁸F-NMR and FT-IR spectroscopy. Vibrational spectroscopy studies were conducted by infrared (FTIR/ATR), Raman spectroscopy and DFT calculations. The presence of methylation in the C2 position gives rise to specific marker bands in theRaman and IR spectra. In order to ascertain whether cation conformers are present in our ionic liquids, a computational study was performed using the density functional theory. The comparison of the experimentaldata and the computed spectra shows that three conformers of the imidazolium ions are present in both ionic liquids.
Volume 134, 2022
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