Abstract Ionic liquids based on three-membered ring aziridinium cations have been synthesized for the first time using a straightforward synthetic route. N-butyl-N- methylaziridinium bis (trifluoromethanesulfonyl) imide, N-propyl-N-ethylaziridinium bis ( trifluoromethanesulfonyl) imide, N-butyl-N-[2-(2-methoxyethoxy) ethyl] aziridinium bis ( trifluoromethanesulfonyl) imide, N-butyl-N-methylaziridinium dicyanamide, and N-butyl-N- ...