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Article Dans Une Revue Heteroatom Chemistry Année : 2010

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

Nabila Aliouane
  • Fonction : Auteur
Salah Chafaa
  • Fonction : Auteur
Tahar Douadi
  • Fonction : Auteur
Jean-Jacques Hélesbeux
Olivier Duval
Gilles Bouet
  • Fonction : Auteur
  • PersonId : 1097390

Résumé

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

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Chimie
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Dates et versions

hal-03250900 , version 1 (05-06-2021)

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Nabila Aliouane, Salah Chafaa, Tahar Douadi, Jean-Jacques Hélesbeux, Mustayeen A Khan, et al.. Novel polydentate phosphonic acids: Protonation and stability constants of complexes with Fe(III) and Cu(II) in aqueous medium. Heteroatom Chemistry, 2010, 21 (2), pp.51-62. ⟨10.1002/hc.20575⟩. ⟨hal-03250900⟩

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