Abstract
Titration data are reported for a number of substituted catechol molecules with ferric chloride. The data are interpreted in terms of the complexes formed and their stabilities. The pH's at which one complex transforms to another have been shown to have a linear relationship to modified Hammett substituent constants. It is demonstrated that this approach can be used to forecast approximate stabilities of complexes formed with iron, if the Hammett substituent constant of the ligand is known.
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