ABSTRACT

Density, refractive index, and speed of sound values of cyclic alanylalanine + aqueous CoCl2 systems have been reported as a function of concentrations of cyclic alanylalanine and that of CoCl2 at temperatures T = (293.15, 298.15, 303.15, 308.15, and 313.15) K. The values of partial molar volumes, isentropic compressibilities, and partial molar isentropic compressibilities of the cyclic alanylalanine + aqueous CoCl2 systems have been calculated from the speed of sound and density data obtained from the experiment at various temperatures. The decreasing value of isentropic compressibility with respect to the molal concentration of cyclic alanylalanine and temperature indicated the presence of strong solute solvent interaction operative in the present system. The variations in partial molar volumes as well as partial molar isentropic compressibilities have been discussed in terms of ionic, hydrophilic, and hydrophobic interactions present in the system.

Compounds

#	Formula	Name
1	Cl2Co	cobalt chloride
2	H2O	water
3	C6H10N2O2	3,6-dimethyl-2,5-piperazinedione

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 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 1; Liquid	Liquid	Standard Abbe refractometry	5
POMD	1 2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 1; Liquid	Liquid	Linear variable-path acoustic interferometer	5
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 1; Liquid	Liquid	Pycnometric method	5
POMD	3 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	Standard Abbe refractometry	5
POMD	3 2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	Linear variable-path acoustic interferometer	5
POMD	3 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	Pycnometric method	5
POMD	3 1 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 1; Liquid	Liquid	Standard Abbe refractometry	50
POMD	3 1 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 3; Liquid	Liquid	Standard Abbe refractometry	50
POMD	3 1 2	Speed of sound, m/s ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 1; Liquid	Liquid	Linear variable-path acoustic interferometer	50
POMD	3 1 2	Speed of sound, m/s ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 3; Liquid	Liquid	Linear variable-path acoustic interferometer	50
POMD	3 1 2	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 1; Liquid	Liquid	Pycnometric method	50
POMD	3 1 2	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 3; Liquid	Liquid	Pycnometric method	50

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

Volumetric, Acoustic, and Refractometric Study of Cyclic Alanylalanine in Aqueous Cobalt Chloride Solutions at Temperatures T = (293.15 to 313.15) K

Karanth, V. R., Bhat, D. K.

ABSTRACT