Solvation behavior of glycine and glycyl dipeptide in aqueous 1-butyl-3-methylimidazolium bromide ionic liquid solutions at different temperatures

摘要: Abstract Densities and speeds of sound glycine glycyl dipeptide (glycylglycine) in aqueous 1-butyl-3 methylimidazolium bromide, [C4mim][Br] solutions have been measured at T = (288.15, 298.15 308.15) K. From the experimental data density speed sound, apparent molar volumes (Vϕ), infinite dilution (Vϕ0), isentropic compression (Kϕ , s) (Kϕ , S0) also determined. Further, partial transfer (ΔtrVϕ0) (ΔtrKϕ , S0) from water to were calculated enlighten interactions such as solute–solute, solute–solvent solvent–solvent present these solutions. The expansivity (Eϕ0), Hepler's constant values ∂ E ϕ 0 T P , thermal expansion coefficient (α) hydration number (nH) evaluated assist interpretations earned volumetric acoustic analysis. found negative for all concentrations ionic liquid except lower concentration with dipeptide. sign indicates co-solutes act a structure breaker.