Effect of protic ionic liquid on the volumetric properties of ribose in aqueous solutions

• Volumetric properties of d(−)-ribose studied in aqueous protic ionic liquid solutions.
• Transfer parameters (ΔtV2° and ΔtK°s,2) are positive for studied system.
• d(−)-ribose interacts more strongly with ionic liquid having acetate as anion compared to formate anion.

The densities, ρ and speeds of sound, u of d(−)-ribose in aqueous solutions of ammonium based protic ionic liquid i.e., 3-hydroxypropylammonium acetate (3HPAAc) have been measured at temperatures (298.15–318.15) K and at atmospheric pressure. These experimental data were used to calculate apparent molar volumes, V2,φ, apparent molar isentropic compressibilities, Ks,2,φ, infinite dilution partial molar volumes, V2°, and partial molar isentropic compressibilities, K°s,2 and the corresponding volumes of transfer (ΔtV2° and ΔtK°s,2). Both ΔtV2° and ΔtK°s,2 values were found to be positive, which increase with cosolute (3HPAAc) concentration and temperature, which indicate the presence of hydrophilic-ionic types of interactions between d(−)-ribose (Rib) and ions of 3HPAAc. Various derived parameters such as expansion coefficients, hydration numbers, pair and triplet interaction coefficients for Rib in aqueous 3HPAAc solutions have also been evaluated and discussed.

Plot of density, ρ versus molalities, m of d(−)-ribose in 0.10 mol kg−1 3-hydroxypropylammonium acetate solutions at T = (298.15–318.15) K.Figure optionsDownload as PowerPoint slide