Dissociation of azo-B-diketone in dioxane/water mixtures

ABSTRACT

The effect of varying the percentage of dioxane and temperature on the pK values of some azo-beta-diketones was studied portestiometrically. The results azo-beta-revealed that the degree of solvation preceeded in accordance with the following order I, II, III, IV. The delta H°, delta G° and delta S° values were evaluted. Evaluation of the isoquilibrium tempratures revealed that for compound I, the dissociation process is entropy and enthalpy controlled while for the other compounds, the process is mainly enthalpy controlled