Effect of the Structure of Alkylimidazolium Protic Ionic Liquids on Their Physicochemical Properties

The authors consider the effect the length of the hydrocarbon radical in the RIm cation (R = H, Me, Et, Pr, Bu) and the nature of the anion (СF 3 SO 3 , HSO 4 , CH 3 SO 3 ) have on the structural and physicochemical characteristics of imidazolium and alkylimidazolium protic ionic liquids. Special attention is given to ion–ion interactions and hydrogen bonding in the ion pairs that are structural units of the studied salts. The structure–properties relationship for the given compounds is analyzed using computational and experimental data.