The basicity and Cu(II) ion complexation of polymers containing amino acid residues, carrying a tertiary amino group in the main chain and a carboxylic group as the side-chain substituent, have been studied in aqueous solution by potentiometric, viscosimetric, and spectrophotometric techniques. Both protonation constants of each polymer follow the modified Henderson-Hasselbach equation. The protonation of a given unit, with one exception, becomes more and more difficult as the degree of protonation of the whole macromolecule increases. A new method of computation for evaluating the stability constants of polymer-metal ion complexes from potentiometric data has been developed. The log β of the CuL+ complex (L being the repeating unit of the polymers) decreases with increasing pH, even if the spectrophotometric parameters of the complex remain constant.
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Barbucci et al. (1986) studied this question.