Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Novel polydentate phosphonic acids: Protonation and stability constants of complexes with Fe(III) and Cu(II) in aqueous medium

Abstract : The acido-basic and the complexation properties of di-, tri-, and tetra-phosphonic acids (H6L1, H8L2, and H10L3) toward Fe(III) and Cu(II) were determined by potentiometric titration in aqueous media at 25.0 ± 0.1°C with constant ionic strength (0.1 M, NaClO4). We have determined six, ten, and eight pKa values for the di, tri, and tetra-phosphonic acids, respectively. In acidic conditions, e.g., 0 ≤ pH ≤ 5; iron and copper presented a high affinity toward these ligands to give complex species. With the ligand H10L3, [FeL3H7], and [CuL3H6]2− were easily obtained at pH 1.8 and 2.7, respectively. We have determined ten stability constants for the H10L3/Fe system and nine for the H10L3/Cu one; six and four in the cases of H8L2/Fe and H8L2/Cu systems, respectively. Finally, five stability constants were calculated for the H6L1/Fe system and four for the H6L1/Cu one. We have not observed any insoluble species in these complexes in acidic medium as well as in alkaline solutions. © 2010 Wiley Periodicals, Inc. Heteroatom Chem 21:51–62, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20575
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

https://hal.univ-angers.fr/hal-03250900
Contributeur : Mustayeen Khan <>
Soumis le : samedi 5 juin 2021 - 12:32:53
Dernière modification le : mercredi 9 juin 2021 - 09:44:04
Archivage à long terme le : : lundi 6 septembre 2021 - 18:03:41

Fichier

2010-Heteroatom Chemistry-Nabi...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Nabila Aliouane, Salah Chafaa, Tahar Douadi, Jean-Jacques Hélesbeux, Mustayeen Khan, et al.. Novel polydentate phosphonic acids: Protonation and stability constants of complexes with Fe(III) and Cu(II) in aqueous medium. Heteroatom Chemistry, Wiley, 2010, pp.51-62. ⟨10.1002/hc.20575⟩. ⟨hal-03250900⟩

Partager

Métriques

Consultations de la notice

17

Téléchargements de fichiers

40