Solvation properties of l-lysine and l-arginine in aqueous solutions of 1-heptyl-3-methyl imidazolium tetrafluoroborate [C7mim][BF4]at different temperatures

Abstract Thermodynamic and physicochemical properties of lysine and arginine in aqueous and aqueous solution of 1-heptyl-3-methyl imidazolium tetrafluoroborate [C7mim][BF4] have been studied by measuring density and speed of sound data at T = (288.15–308.15 K) under atmospheric pressure. The measured data has been further used to calculate limiting partial molar volume, V ϕ 0 , the limiting partial molar compression K ϕ , S 0 , and limiting partial molar volumes of transfer, Δ tr V ϕ 0 , and limiting partial molar isentropic compression of transfer Δ tr K ϕ , S 0 . Furthermore, structure making and structure breaking ability of solute has been discussed by evaluation of apparent molar expansivity, E ϕ 0 , Hepler's constant values, ∂ E ϕ 0 ∂ T P and hydration numbers, n H .