Synthesis and properties of protic hydroxylic ionic liquids with two types of basic centers in their composition

1-((3-(1H-imidazol-1-yl)propyl)amino)-3-butoxypropan-2-ol with two types of nitrogenous centers and variable basicity was synthesized by reaction of butyl glycidyl ether with 1-(3-aminopropyl)imidazole. Ethanesulfonic acid was used for equimolar and complete neutralization of the obtained compound to produce hydroxylic ionic liquids. N-acetyl derivatives. of the given liquid with ethanesulfonate and acetate counterions were also synthesized. According to H-1 NMR spectroscopy, equimolarly neutralized compounds are characterized by a rapid migration of protons between the basic centers using the mechanisms of intermolecular and intramolecular transfer with a predominance of the latter at higher temperatures. Fully protonated ionic liquids are characterized by a low glass transition temperature (-60.9 degrees C) and a high conductivity 5.45.10(-4)S/cm at 20 degrees C under anhydrous conditions. Notably, there is an absence of determined correlation between the glass transition temperature or conductivity and the value of the viscosity of the ILs. Published by Elsevier B.V.