The acidity constants of 14 recently synthesized derivatives of 9,10-anthraquinone in methanol + water at 25°C and an ionic strength of 0.1 M have been determined spectrophotometrically. A linear inverse relationship between the pK a of all acids and the mole fraction of methanol in the solvent mixtures is observed. The influence of substituents in the molecular structure on the ionization constants is discussed.
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