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

The densities, rho 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, V-2,V-phi, apparent molar isentropic compressibilities, K-s,K-2,K-phi infinite dilution partial molar volumes, V-2 degrees, and partial molar isentropic compressibilities, K-s,K-2 degrees and the corresponding volumes of transfer (Delta V-t(2)degrees and Delta K-t(s,2)degrees). Both Delta V-t(2)degrees and Delta K-t(s,2)degrees 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. (C) 2015 Elsevier B.V. All rights reserved.