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Galceran J, Lao M, David C, Companys E, Rey-Castro C, Salvador J, Puy J. The impact of electrodic adsorption on Zn, Cd and Pb speciation measurements with AGNES. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.03.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Lluís Garcés J, Rey-Castro C, David C, Madurga S, Mas F, Pastor I, Puy J. Model-Independent Link between the Macroscopic and Microscopic Descriptions of Multidentate Macromolecular Binding: Relationship between Stepwise, Intrinsic, and Microscopic Equilibrium Constants. J Phys Chem B 2009; 113:15145-55. [DOI: 10.1021/jp9041815] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Josep Lluís Garcés
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Carlos Rey-Castro
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Calin David
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Sergio Madurga
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Francesc Mas
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Isabel Pastor
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
| | - Jaume Puy
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure, 191 E-25198 Lleida, Spain, EU, and Physical Chemistry Department & Theoretical and Computational Chemistry (IQTCUB), Universitat de Barcelona (UB), C/ Martí i Franquès, 1 E-08028 Barcelona, Spain, EU
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David C, Companys E, Galceran J, Garcés JL, Mas F, Rey-Castro C, Salvador J, Puy J. Competitive ion complexation to polyelectrolytes: determination of the stepwise stability constants. The Ca2+/H+/polyacrylate system. J Phys Chem B 2007; 111:10421-30. [PMID: 17696470 DOI: 10.1021/jp0741206] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work presents a new methodology aimed at obtaining the stepwise stability constants corresponding to the binding of ions (or other small molecules) to macromolecular ligands having a large number of sites. For complexing agents with a large number of sites, very simple expressions for the stepwise stability constants arise. Such expressions are model-independent; that is, they allow the determination of the stepwise stability constants without making any previous assumption of the detailed complexation mechanism. The formalism is first presented for a single complexing ion and further extended to competitive systems where the competing ions can display, in general, different stoichiometric relationships. These ideas are applied to the analysis of experimental titrations corresponding to competitive binding of calcium ions to poly(acrylic acid) for different pH values and ionic strengths. Intrinsic stability constants were estimated from the stepwise stability constants (by removing the corresponding statistical factor), and split into specific and electrostatic contributions (by means of the Poisson-Boltzmann equation). After this treatment, the specific proton binding energies showed almost no dependence on the coverage and ionic strength. Likewise, for the range of concentrations studied, the specific component of the intrinsic stability constants of the calcium ions, calculated assuming bidentate binding of Ca to neighboring groups of a linear chain, is almost independent of the calcium and proton coverage and ionic strength.
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Affiliation(s)
- Calin David
- Departament de Química, Universitat de Lleida (UdL), Av. Rovira Roure 191, E-25198 Lleida, Spain
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Torrent M, Puy J, Companys E, Galceran J, Salvador J, Garcés JL, Mas F. Voltammetry of heterogeneous labile metal–macromolecular systems for any ligand to metal ratio: part IV. Binding curve from the polarographic waves. J Electroanal Chem (Lausanne) 2005. [DOI: 10.1016/j.jelechem.2004.12.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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