Volumetric Properties and Conductivities of 1-Butyl-3-methylimidazolium Tetrafluoroborate + Sucrose + Water Mixtures

Abstract

Densities, limiting molar conductivities (Λ0), and Walden products (Λ0η) for 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4])−sucrose−water solutions were determined at 298.15 K. The measured densities were used to calculate the apparent molar volumes of sucrose (VΦ,S) and [Bmim][BF4] (VΦ,IL) in the studied solutions. Infinite dilution apparent molar volumes, VΦ,S∞ and VΦ,IL∞, have been evaluated, together with the standard transfer volumes of the sucrose (ΔtVS∞) from water to aqueous solutions of [Bmim][BF4] and those of [Bmim][BF4] (ΔtVIL∞) from water to aqueous sucrose solution. It was shown that the ΔtVS∞ and ΔtVIL∞ values are positive and increase with increasing molalities of [Bmim][BF4] and sucrose, respectively. The volumetric interaction parameters for [Bmim][BF4]−sucrose pairs in water were also obtained and interpreted by the structural interactions model. Additionally, the Λ0 values for [Bmim][BF4] decrease with the molality of sucrose (mS), as well as Walden products (Λ0η), due to ...