Effect of base–acid properties of the mixtures of water with methanol on the solution enthalpy of selected cyclic ethers in this mixture at 298.15 K

Abstract

The enthalpies of solution of cyclic ethers: 1,4-dioxane, 12-crown-4 and 18-crown-6 in the mixture of water and methanol have been measured within the whole mole fraction range at T = 298.15 K. Based on the obtained data, the effect of base-acid properties of watermethanol mixtures on the solution enthalpy of cyclic ethers in these mixtures has been analyzed. The solution enthalpy of cyclic ethers depends on acid properties of watermethanol mixtures in the range of high and medium water contents in the mixture. Based on the analysis performed, it can be assumed that in the mixtures of high methanol contents, cyclic ether molecules are preferentially solvated by water molecules.

Effect of Base–Acid Properties of Mixtures of Ethanol with Water on the Enthalpy of Solution of Cyclic Ethers in these Mixtures at T = 298.15 K

“… a Data taken from Ref. [ 24 ] b Data taken from the present paper c Data taken from Ref. [ 25 ] d The parameters of Eq.…”

“…To characterize the Lewis basicity of the solvent, the Kamlet–Taft parameter B KT has been used, while the Lewis acidity has been expressed by the standardized Dimroth–Reichardt parameter [ 26 ]. In earlier works, mixtures of water (W) and the organic solvents acetonitrile (AN) [ 22 ], acetone (ACN) [ 23 ], dimethylsulfoxide (DMSO) [ 23 ], methanol (MeOH) [ 24 ] and propan-1-ol (PrOH) [ 25 ] were used for such studies.…”

Effect of properties of the N,N-dimethylformamide + methanol and N,N-dimethylformamide + water mixtures on the solution enthalpy of cyclic ethers in these mixtures at 298.15 K

“…In earlier works, we examined, from this point of view, the solutions in mixed solvents, where one of the mixture components was water. They were the mixtures of water (W) with organic solvents such as: propan-1-ol (PrOH) [19,20], acetonitrile (AN) [19,21], acetone (ACN) [22], dimethylsulfoxide (DMSO) [22] and methanol (MeOH) [33].…”