In recent years, ionic liquids have been the subject of considerable interest as promising media for chemical reactions including of electroorganic synthesis because of their unique characteristics such as low melting point, negligible vapor pressure, non-flammability, high conductivity and the good solubility of many organic and inorganic compounds as well as biomaterials.¹ In the development of ionic liquid study, here we reported the synthesis of redox active ionic liquids, such as 1-ethyl-4-(methoxycarbonyl)pyridinium bis(trifluoromethanesulfonyl)amide (P1•TFSA) and 1-ethyl-3-(ethoxycarbonyl)pyridinium bis(trifluoromethanesulfonyl)amide (m3•TFSA). These redox active ionic liquids were synthesized from its iodide form by anion exchange reaction and were characterized by NMR, UV-VIS, IR and elemental analyses. These compounds showed redox waves around -0.6~-1.5 V vs. Ag/AgCl and were worked as electron mediator for the electroorganic reaction (Figure 1).

References

1) J. P. Hallett, T. Welton, Chem. Rev. 2011, 111, 3508.