Fluorosulfonyl-(trifluoromethanesulfonyl)imide ionic liquids with enhanced asymmetry
Literature Information
Jakub Reiter, Sebastian Jeremias, Elie Paillard, Martin Winter, Stefano Passerini
New ionic liquids with an asymmetric anion, fluorosulfonyl-(trifluoromethanesulfonyl)imide (FTFSI), were prepared and their chemical–physical properties were investigated. The ionic liquids based on N-methyl-N-propylpyrrolidinium, PYR13, N-butyl-N-methylpyrrolidinium, PYR14, and N-methoxyethyl-N-methylpyrrolidinium, PYR12O1, exhibit high electrochemical stability (>5.5 V on platinum) and thermal stability (>250 °C in N2 and >200 °C in O2). Due to the highly asymmetric anion, the prepared ionic liquids do not crystallize down to −150 °C while maintaining ionic conductivity above 10−4 S cm−1 even at −40 °C. Conductivity and viscosity values at 20 °C are in the range 3.5–5.0 mS cm−1 and 30–60 mPa s respectively. PFG-NMR measurements showed high self-diffusion coefficients of cations and the anion.
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