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

ABSTRACT

The carbazochrome solubility in solvent Page 2 of 37 mixtures of DMF (N,N-dimethylformamide, 1) + methanol (2), DMF (1) + ethanol (2), DMF (1) + n-propanol (2) and dimethyl sulfoxide (DMSO, 1) + water (2) was measured by the static method within the temperature range from (278.15 to 318.15) K under atmospheric pressure p = 101.0 kPa. The solubility of carbazochrome increased with rising mass fraction of DMF or DMSO and temperature. The Jouyban- Acree, van't Hoff-Jouyban-Acree and Apelblat-Jouyban-Acree models were used to correlate the obtained solubility, and the Apelblat-Jouyban-Acree model provided better correlation results. The parameters of preferential solvation (x1,3) were acquired from the mixture properties with the method of inverse Kirkwood-Buff integrals. The values of x1,3 changed non-linearly with the DMF/DMSO (1) proportion in the studied mixed solvents. The carbazochrome was solvated preferentially by alcohol or water in alcohol or water-rich solutions, and preferentially solvated by DMF/DMSO in DMF/DMSO-rich mixtures. It could be speculated that in DMF/DMSO-rich mixtures the interaction by acidic hydrogen-bonding upon the basic sites of carbazochrome played a significant role in carbazochrome solvation.