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The ionic liquids were purchased from Iolitec (Germany) and included: 1-butyl-3-methylimidazolium hexafluorophos-phate (BMIM-PF₆), 1-ethyl-3-methylimidazolium bis(triflu oromethylsulfonyl)imide (EMIM-NTf), 1-hexyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (HMIM-NTf), 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIM-PF₆), 1-hexyl-3-methylimidazolium trifluoromethanesulfonate (HMIM-OTf), 1-octyl-3-methylimidazolium hexafluorophosphate (OMIM-PF₆), 1,2-dimethyl-3-propylimidazolium bis(tr ifluoromethylsulfonyl)imide (DMPIM-NTf), 3-methyl-1-pro-pyl-pyridinium bis(trifluoromethylsulfonyl)imide (PMPI-NTf), trimethyl(butyl)ammonium bis(trifluoromethylsulfonyl)imide (N1114-NTf), methyl(trioctyl)ammonium bis(trifluoromethyls ulfonyl)imide (N1888-NTf), 1-methyl-1-propyl-pyrrolidinium bis(trifluoromethylsulfonyl)imide (BLP-NTf), 1-methyl-1-propyl-piperidiniumbis(trifluoromethylsulfonyl)imide (MP-PIP-NTf), triethylsulfonium bis(trifluoromethylsulfonyl)imide. (SEt₃-NTf), and 1-decyl-3-methylimidazolium tetrafluoroborate (bmim-BF₄).