Subsistence of diverse interactions of some biologically important molecules in aqueous ionic liquid solutions at various temperatures by experimental and theoretical investigation

Abstract

To investigate significant molecular interactions, different Physico-chemical methodologies have been studied and measured for mixtures of aqueous Benzyltriethylammonium chloride with two amino acids (L-Cysteine and Glycine) at various concentrations and temperatures under atmospheric pressure. The origin of various interactions is exposed by evaluating the apparent molar volume (ϕV), limiting apparent molar volume (ϕV0), viscosity A and Bcoefficients, molar refraction (RM), limiting molar refraction (RM0), and detected strong solute-solvent interaction is predominating over the solute-solute and also solvent-solvent interactions in the ternary mixtures. The solute-solvent interaction is measured through (δϕE0/δT)P and (dB/dT) data which provide information like structure-breaking. The findings of 1H NMR spectroscopy show that, in addition to H-bonding interactions, the ionic liquid and amino acids have significant hydrophobic-hydrophobic interactions, which is confirmed by theoretical explanations. L-Cysteine-IL interactions are more prominent than Glycine-IL interactions, according to both experiment and theory.