ABSTRACT

tThe enthalpies of l-methionine dissolution in aqueous solution of acetonitrile, 1,4-dioxane, acetone, dimethylsulfoxide, formamide, N-methylformamide, N,N-dimethylformamide and N,N-dimethylacetamide were determined by calorimetric method at 298.15 K and organic solvent mole fractions up to x2 = 0.35. The standard enthalpies of solution ( solH.) and transfer ( trH.) of l-methionine from water to a mixed solvent as well as the enthalpy coefficients of pairwise interactions (hxy) were calculated. The interrelation between enthalpy characteristics of l-methionine dissolution (transfer) and the composition of water.organic mixtures was determined. Contributions of the organic solvent properties (molar volume, cohesion energy density, polarity/polarizability, acidity and basicity) to the energy of pairwise interactions of l-methionine . organic solvent were estimated quantitatively by means of a modified Kamlet-Taft equation. Some characteristics of intermolecular interactions of l-methionine with the molecules of organic solvents were compared with the analogous characteristics of previously investigated amino acids.

Compounds

#	Formula	Name
1	C5H11NO2S	L-methionine
2	C2H3N	acetonitrile
3	C4H8O2	1,4-dioxane
4	C3H6O	acetone
5	CH3NO	formamide
6	C2H5NO	N-methylformamide
7	C3H7NO	dimethylformamide
8	C4H9NO	N,N-dimethylethanamide
9	C2H6OS	dimethyl sulfoxide
10	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 5 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	12
POMD	1 6 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 6; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 7 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 7; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 8 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 8; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 2 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 3 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 4 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 9 10	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 9; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	ISOPERIBOL	13
POMD	1 10	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid		Liquid	ISOPERIBOL	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Influence of the composition of water organic mixtures and the properties of organic solvents on thermochemical characteristics of l-methionine dissolution at 298.15 K

Smirnov, V. I.[Valeriy I.], Badelin, V. G.[Valentin G.]

ABSTRACT