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. © 1986, American Chemical Society. All rights reserved.
Barbucci, R., Casolaro, M., Nocentini, M., Corezzi, S., Ferruti, P., Barone, V. (1986). Acid-base and metal ion complex formation properties of polymers containing amino-acids residues. MACROMOLECULES, 19(1), 37-42 [10.1021/ma00155a007].
Acid-base and metal ion complex formation properties of polymers containing amino-acids residues
Casolaro, Mario;
1986-01-01
Abstract
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. © 1986, American Chemical Society. All rights reserved.
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https://hdl.handle.net/11365/28117
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