The proton, acid, dissociation constants of some derivatives of salicylaldehyde and of 8-hydroxyquinoline (oxine) have been determined, and compared with the stability constants of the complexes formed by the ligands derived from these acids and several cations. The relationship between these quantities is more complicated than has been assumed hitherto. The discussion is supported by reference to the absorption spectra of the metal complexes. The general approach can be extended to other series of ligands.
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