Abstract
The effects of different organic solvent + water mixtures on the acidity constants of some azothienopyridine derivatives were studied. The organic solvents used are methanol, ethanol, acetone, and dimethylformamide. The results obtained are discussed in terms of the solvent characteristics. The pKa values of the dyes studied were determined and found to depend largely on both the amount and nature of the organic cosolvent. Hydrogen-bonding interactions of the conjugate base with solvent molecules as well as the solvent basicity contribute the major effect on the ionization process. The effect of the molecular structure of the azo compound on the pKa value is discussed.
Published Version
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