ABSTRACT

Enthalpies of dilution of N,N-dimethylformamide (DMF) in aqueous sucrose and glucose solutions have been determined using an isothermal calorimeter (4400 IMC) at 298.15 K. The values of dilution enthalpy were used to determine homogeneous enthalpic interaction coefficients which characterize the interactions of examined DMF in aqueous sugar solutions. The results show that enthalpic pair interaction coefficients h2 of DMF are all positive in aqueous sugar solutions and pass through a maximum, respectively, atm "" 0.5 mol kg-1 ofsucrose and at m"" 0.55 mol kg-1 ofglucose in mixed solvents. In the meantime the h2 coefficients of DMF in aqueous sucrose solutions are more positive than that in aqueous glucose solutions. The variations of the enthalpic pairwise interaction coefficients with the mass fraction of sugar in mixtures are interpreted in terms of solute-solute and- solute-solvent interactions.

Compounds

#	Formula	Name
1	C3H7NO	dimethylformamide
2	C12H22O11	D-sucrose
3	C6H12O6	D-glucose
4	H2O	water

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 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Final molality of solute, mol/kg; Liquid	Initial molality of solute, mol/kg; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	12
POMD	2 1 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	90
POMD	3 1 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 3; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	90

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpic interactions of N,N-dimethylformamide in aqueous glucose and sucrose solutions at 298.15 K

Wang, X.[Xu], Ma, L.[Lin], Lin, R.[Ruisen]

ABSTRACT