Effect of [Bmim][Br] and [Emim][HSO4] on the solution properties of pyridoxine HCl at various temperatures: A physicochemical, thermodynamic and spectroscopic approach

Abstract

The current paper is concerned with deliberation of physicochemical and thermodynamic parameters of pyridoxine HCl in water and binary aqueous (0.05, 0.10 and 0.15) mol kg−1 [Bmim][Br]/[Emim][HSO4] media by means of empirically acquired density, velocity of sound and viscosity data. These parameters have been evaluated for the examination of interactions prevailing between pyridoxine HCl and [Bmim][Br]/[Emim][HSO4] in aqueous medium over a temperature range (293.15 to 313.15) K and at 0.1 MPa pressure. The deliberated parameters include partial molar volumes (Vϕo), partial molar isentropic compressibilities (Kϕ,so), Jones-Dole coefficients (A and B) and thermodynamic parameters of viscous flow (Δμ10,Δμ20, ΔH20andTΔS20) etc. Further, apparent specific volume (ASV) has been studied for pyridoxine HCl in water and in aqueous IL systems, showing that the studied systems have sweet-bitter taste at all temperatures and compostions. Moreover, the trends corresponding to deviation in computed parameters have been analysed in light of the solute−solvent and solute−solute interactions prevailing in the systems. Additionally, UV spectral analysis has been carried out for the interpretation of interactions prevailing between pyridoxine HCl and [Bmim][Br]/[Emim][HSO4]. By the obtained results, we have inferred that there is dominance of ion-hydrophillic and hydrophilic-hydrophillic interactions in the investigational systems.