Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of solution of a-alanyl-a-alanine in aqueous solution of amides at 298.15 K

Smirnov, V. I.[Valeriy I.], Badelin, V. G.[Valentin G.]
Thermochim. Acta 2012, 536, 74-6
ABSTRACT
The enthalpies of solution have been determined for a-alanyl-a-alanine (bAlabAla) in aqueous solutions of formamide, N-methylformamide, N,N-dimethylformamide and N,Ndimethylacetamide. Measurements were made at 298.15 K and mole fraction of amide x2 = (0 to 0.35) with a precise isoperibol calorimeter. The results obtained have been used to calculate the standard enthalpies of solution and transfer of the bAlabAla from water into the mixtures as well as the enthalpy coefficients of pair-wise interaction (hxy) of the solute with the amide in aqueous media. It is established the interrelation between enthalpic characteristics of bAlabAla dissolution (transfer) and the composition of water-amide binary mixtures.
Compounds
# Formula Name
1 C6H12N2O3 .beta.-alanine, N-.beta.-alanyl-
2 C3H7NO dimethylformamide
3 CH3NO formamide
4 C2H5NO N-methylformamide
5 C4H9NO N,N-dimethylethanamide
6 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
  • 3
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 3; Liquid
  • Molality, mol/kg - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • ISOPERIBOL
  • 11
  • POMD
  • 4
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 4; Liquid
  • Molality, mol/kg - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • ISOPERIBOL
  • 12
  • POMD
  • 2
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 2; Liquid
  • Molality, mol/kg - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • ISOPERIBOL
  • 12
  • POMD
  • 5
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 5; Liquid
  • Molality, mol/kg - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • ISOPERIBOL
  • 12