Application, thermodynamic, transport and structure properties of 1-alkyl-3-ethylimidazolium based ionic liquids

In order to better assess advantages of the ionic liquids with ethyl group at the position N-3 of the imidazolium cation, 1,3-diethylimidazolium bromide, 1-butyl-3-ethylimidazolium bromide, 1-hexyl-3-ethylimidazolium bromide and 1-octyl-3-ethylimidazolium bromide ionic liquids are synthesized and fully characterized by NMR, IR, and thermogravimetric measurements. All mentioned ionic liquids are obtained applying both, classical synthetic path, and also microwave assisted reaction approach respecting the main principles of green chemistry – energy consumption as well as reaction time reduction. Physicochemical properties of pure ionic liquids and nature of the interactions in aqueous solutions have been investigated measuring density, electrical conductivity, and viscosity over the whole composition range at different temperatures at atmospheric pressure. The effect of the alkyl chain length in on thermodynamic and transport properties is examined applying experimental techniques and molecular dynamic simulations. A possible application of these ionic liquids as novel electrolytes in different technological areas, corrosion inhibitors or new extractants is also examined.