Experimental and theoretical study of the physicochemical properties of the novel imidazole-based eutectic solvent

ElsevierVolume 118, January 2023, 108319Journal of Molecular Graphics and ModellingHighlights•

Imidazole and Monoethanolamine (MEA) were used for the first time to synthesize eutectic solvents at different molar ratios.

FTIR and 1H NMR analyses were conducted to characterize and confirm the formation of eutectic solvents.

The inter-molecular interactions between the two solvent molecules were investigated by conducting MD simulations and DFT.

The H-bonding is strong and electrostatic in nature with binding energy values proportional to the solvent molar ratio.

Abstract

Novel solvents and their applications are experiencing an increasing interest by the scientific community. Imidazole has been utilized as a major component in many successful ionic liquids. However, very limited studies were reported for using it as a hydrogen bond acceptor in the synthesis of eutectic solvents. In this work, a novel eutectic solvent composed of Imidazole and Monoethanolamine (MEA) is synthesized at different molar ratios. The basic physicochemical properties such as melting point, density, viscosity, and refractive index were measured at different temperatures and modeled as a function of molar composition and temperature. FTIR and 1H NMR analyses were conducted and, the nature and strength of the molecular interaction between the two solvent molecules were investigated by conducting combined molecular dynamics (MD) simulations and density functional theory (DFT) calculations. The study revealed the electrostatic H-bonding nature of interaction with strength related to their bond distances. The binding energy between the two DES ingredients is proportional to the amount of MEA in the DES due to increasing the H-bonding interactions between Imidazole and MEA molecules. These findings suggest that DES might be used in a variety of chemical and industrial applications.

Keywords

Deep eutectic solvent

Imidazole

Monoethanolamine

DFT

Melting point

Density

Viscosity

And refractive index

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