Nitrile-functionalized azepanium ionic liquids: Synthesis characterization and thermophysical properties

Abstract The synthesis of nitrile-functionalized azepanium ionic liquids such as 1-butyl-1-(2-cyano-ethyl)-azepanium bromide, [C 4CN Azp][Br], 1-butyl-1-(2-cyano-ethyl)azepanium trifluoroacetate, [C 4CN Azp][TFA], 1-butyl-1-(2-cyano-ethyl)-azepanium methanesulfonate [C 4CN Azp][CH 3 SO 3 ], 1-butyl-1-(2-cyano-ethyl)azepanium trifluoromethanesulfonate [C 4CN Azp][CF 3 SO 3 ], 1-butyl-1-(2-cyano-ethyl)azepaniummethanesulfate[C 4CN Azp][CH 3 SO 4 ],1-butyl-1-(2-cyano-ethyl) azepanium p -toluenesulfonate [C 4CN Azp][PTS] were performed. The synthesis of ionic liquids was performed in three steps. 1 H, 13 C and CHNS elemental analysis were used to characterize the synthesized ionic liquids. The thermal stability, melting point and glass transition temperature of the ionic liquids were determined. The nitrile-functionalized ionic liquids showed good thermal stability.