Some physico-chemical properties of ethanolamine ionic liquids: Behavior in different solvents

Abstract

The series of ethanolamine derived ionic liquids (ILs) 1-9, was synthesized, characterized by IR and 1H NMR spectroscopy and investigated by DFT study, to explore their properties in solvents with different dielectric constants. The investigation of the anion-cation and ion-solvent interactions of ILs in solvents with different polarity was performed. The obtained results showed that solvation has significant influence on anion-cation interaction. The binding energies of the anion-cation interaction obtained in different solvents showed that in polar solvents ILs exist as separated solvated ions, while in solvents with lower polarity as the contacted ion pair. Density functional studies showed that solvation energies decrease with the increase of solvent polarity. © 2012 Elsevier B.V. All rights reserved.