Role of the NH3+moiety in iron(III)–, aluminium(III)– and gallium(III)–aminohydroxamate interactions
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 3,p. 477-481
- https://doi.org/10.1039/dt9950000477
Abstract
Stability constants have been determined and the bonding modes and effects caused by the side-chain NH3 + moiety in aminohydroxamic acids evaluated for complexes formed in aqueous solution in between iron(III), aluminium(III) and gallium(III) with α-alaninehydroxamic acid (α-Alaha), β-alaninehydroxamic acid (β-Alaha), aspartic acid-β-hydroxamic acid (Asp-β-ha) and glutamic acid-γ-hydroxamic acid (Glu-γ-ha). The iron(III)–, aluminium(III)– and gallium(III)–acetohydroxamic acid (aha) systems were studied as models. Co-ordination of hydroxamate oxygens occurs in the cases of aha, α- and β-Alaha, while Asp-β-ha and Glu-γ-ha are co-ordinated via their hydroxamate and carboxylate oxygens. The OH– ion was found to be an effective ligand in these systems (especially for GaIII) causing the formation of both binary and ternary hydroxo complexes. The presence of NH3 + in the hydroxamic acids favours the hydrolysis to an extent which depends on the distance between the hydroxamate moiety and NH3 +. These findings can be explained by the electron-withdrawing effect of NH3 + and electrostatic repulsion between it and the co-ordinating M3+ ion.Keywords
This publication has 18 references indexed in Scilit:
- Chiral siderophore analogs: ferrichromeInorganic Chemistry, 1993
- Chiral siderophore analogs: ferrioxamines and their iron(III) coordination propertiesInorganic Chemistry, 1993
- A new iron(III) ion sequestering ligand: synthesis, solution chemistry and electrochemistryJ. Chem. Soc., Dalton Trans., 1993
- Metal complexes of glutamic acid-γ-hydroxamic acid (Glu-γ-ha)(N-Hydroxyglutamine) in aqueous solutionJ. Chem. Soc., Dalton Trans., 1993
- Hydroxamic and aminohydroxamic acids and their complexes with metal ionsCoordination Chemistry Reviews, 1992
- Complex formation between transition metals andDL-aspartic acid-β-hydroxamic acid (N-hydroxyasparagine)J. Chem. Soc., Dalton Trans., 1990
- Ferric ion sequestering agents. 21. Synthesis and spectrophotometric and potentiometric evaluation of trihydroxamate analogs of ferrichromeInorganic Chemistry, 1989
- Complex-forming properties ofL-α-alaninehydroxamic acid (2-amino-N-hydroxypropanamide)J. Chem. Soc., Dalton Trans., 1989
- Aqueous complexes of gallium(III)Inorganic Chemistry, 1976
- Determination of the Equivalent Point in Potentiometric Titrations.Acta Chemica Scandinavica, 1950