1969 Volume 42 Issue 12 Pages 3425-3433
The complex-formation equilibria of copper(II) in chloroform, benzene, or methyl isobutyl ketone (MIBK) containing both acetylacetone (AA) and thenoyltrifluoroacetone (TTA) have been determined by means of a liquid-liquid distribution method and a spectrophotometric method. The extraction constants or the extinction coefficients of the pure complexes were first determined in solutions containing only one of the liquids, and then these constants for the mixed complex and the equilibrium constants among the three complexes in these solvents were determined by the analysis of the results obtained from the experiments in mixed-ligand solutions. From these data, the following conclusions were reached. The constants experimentally obtained are almost identical with those statistically expected. The absorption spectrum of the mixed complex isolated from the absorption of the mixed-ligand system by the statistical analysis is more similar to that of the TTA complex than to that of the AA complex. The results obtained by these two methods are somewhat different from each other.
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