Abstract
Thermodynamic proton—ligand stability constants, Tp K a, of tropolone have been determined pH-metrically in 0–50 vol.% dioxane—water mixtures at 25 and 35±0.01°C applying an empirical pH correction for mixed aqueous media. Tropolone is a very weak acid with a Tp K a value between 6.9 and 8.8. Tp K a values do not vary linearly with the reciprocal of the dielectric constant of the medium, but a plot of Tp K a vs. the mole fraction of dioxane is linear at a given temperature. Values of Δ G 0 and Δ H 0 and Δ S 0 are also computed. Temperature as well as medium effects are briefly discussed.
Published Version
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