Synthesis And Characterization Of Triflouroacetylated Imidazole Based Ionic Liquids

The ionic liquid field has been extensively dominated by imidazolium salts with anions mostrnfrequently being fluorine-containing. By modifying the anion or the fluorine containing cation, arnwide range of properties can be tuned. Ionic liquids with fluorine-containing groups in therncation are promising solvents for electrochemical, photovoltaic, surfactant and syntheticrnapplications. Previously, 1-methyl-3-triflouroacetyl imidazolium trifluoroacetate ionic liquidrnwas synthesised but with high melting point. Following this synthesis, in the present study, arntriflouroacetylated imidazole based ionic liquid with longer alkyl chain; 1-pentyl-3-rntriflouroacetyl imidazolium based ionic liquid was synthesized by alkylation of imidazolernfollowed by triflouroacetylation and resulted in a viscous solid. The ionic liquid wasrncharacterized by NMR. In the second trial, the same procedure was repeated increasing thernreaction time and the crude product was distilled under vacuum and yielded a new crystallinernhydroxide anion based 1-pentyl-3-triflouroacetyl imidazolium ionic liquid. This result wasrnevident from NMR characterization and elemental analysis. This ionic liquid was soluble inrnwater and in most of organic solvents and was found to be highly hygroscopic and an electrolyte.rnKey words: alkylation; triflouroacetylation; ionic liquids

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