ABSTRACT

The dissolution enthalpy of 1,4-dioxane and 12-crown-4 ethers in the mixture of water and N,N-dimethylformamide was measured at four temperatures within the range from (293.15 to 308.15) K. The values of partial molar heat capacity (Cp,2o) and hydrophobic hydration effect, Hb(W), were determined. The effect of temperature on the process of hydrophobic hydration of cyclic ethers has been interpreted. An increase in temperature results in the increased values of the standard enthalpies of solution, ?solHmo (a lower exothermic effect), while the exothermic enthalpic effect of hydrophobic hydration, Hb(W), decreases with increasing temperature.

Compounds

#	Formula	Name
1	C4H8O2	1,4-dioxane
2	C8H16O4	1,4,7,10-tetraoxacyclododecane
3	H2O	water
4	C3H7NO	dimethylformamide

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	3
POMD	4 1	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	3
POMD	4 2	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	ISOPERIBOL	3
POMD	2 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	ISOPERIBOL	3
POMD	4 1 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	45
POMD	4 2 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	ISOPERIBOL	60

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Effect of Temperature on the Process of Hydrophobic Hydration. Part I. Hydrophobic Hydration of 1,4-Dioxane and 12-Crown-4 Ethers

Jozwiak, M.[Malgorzata], Kosiorowska, M.[Monika]

ABSTRACT