A Comprehensive Study on Molecular Interactions of l -Ascorbic Acid/Nicotinic Acid in Aqueous [BMIm]Br at Varying Temperatures and Compositions: Spectroscopic and Thermodynamic Insights

This is the authors' abstract. We don't add key points for this paper.

Herein, thermophysical properties of l -ascorbic acid and nicotinic acid in different compositions (0.05, 0.10, and 0.15) mol kg –1 of aqueous [BMIm]Br solvent media have been investigated. Different thermodynamic and viscometric parameters have been deduced at distinct temperatures (293.15–318.15 K) and at 0.1 MPa via density, speed of sound, and viscosity data to arrive at logical conclusions. The evaluated parameters include partial molar volume ( V ϕ 0 ), partial molar expansivity ( E ϕ 0 ), partial molar isentropic compression ( K ϕ,s 0 ), viscosity coefficients ( A and B ), transfer values, thermodynamic parameters (Δμ 1 0, Δμ 2 0, Δ H 2 0, and T Δ S 2 0 ), etc. These parameters have been interpreted in provisions of different interactions prevailing between taken vitamins and [BMIm]Br in an aqueous medium. In addition, UV spectroscopy has been used to examine the interactions prevailing between selected vitamins and [BMIm]Br. From the procured results, we can state that there is supremacy of ion–dipole and dipole–dipole interactions in the studied systems.