Speed of sound and apparent molar isentropic compression of 1-butyl-3-methylimidazolium bromide in aqueous monosaccharide solutions

The nature of intermolecular interactions occurring between ionic liquid, 1-butyl-3-methylimidazolium bromide, [Bmim]Br and monosaccharides viz. D(−)-ribose and D(−)-arabinose have been studied by measuring the speed of sound of [Bmim]Br in water and in (0.10, 0.20, 0.30, and 0.40) mol·kg− 1 aqueous monosaccharides solutions at temperatures (288.15 to 318.15) K and at 101.3 kPa. Infinite dilution partial molar isentropic compression, Ks,2° and the empirical parameters (SK and Bk) have been calculated from apparent molar isentropic compression, Ks,2,ϕ, by using Redlich-Mayer type of equation. The isentropic compression of transfer, ∆tKs,2° have also been calculated and was found to be positive, which increase with increase in concentration of monosaccharide and temperature. Positive ∆tKs,2° values observed suggest the dominance of hydrophilic-ionic interactions between ions of [Bmim]Br and monosaccharides. Effect of stereochemistry of monosaccharides on the solvation behavior of [Bmim]Br has also been discussed.