Role of the NH3 + moiety in iron(III)-, aluminium(III)- and gallium(III)-aminohydroxamate interactions

E. Farkas, Emese Kozma, T. Kiss, Imre Tóth, Barbara Kurzak

Research output: Contribution to journalArticle

31 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)477-481
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number3
DOIs
Publication statusPublished - 1995

Fingerprint

Hydroxamic Acids
Gallium
Aluminum
Iron
Aspartic Acid
Glutamic Acid
Ions
Oxygen
Acids
Electrostatics
Hydrolysis
Ligands
Electrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Role of the NH3 + moiety in iron(III)-, aluminium(III)- and gallium(III)-aminohydroxamate interactions. / Farkas, E.; Kozma, Emese; Kiss, T.; Tóth, Imre; Kurzak, Barbara.

In: Journal of the Chemical Society, Dalton Transactions, No. 3, 1995, p. 477-481.

Research output: Contribution to journalArticle

@article{3f9360cb4147467da10c9568c39d871d,
title = "Role of the NH3 + moiety in iron(III)-, aluminium(III)- and gallium(III)-aminohydroxamate interactions",
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.",
author = "E. Farkas and Emese Kozma and T. Kiss and Imre T{\'o}th and Barbara Kurzak",
year = "1995",
doi = "10.1039/DT9950000477",
language = "English",
pages = "477--481",
journal = "Dalton Transactions",
issn = "1472-7773",
publisher = "Royal Society of Chemistry",
number = "3",

}

TY - JOUR

T1 - Role of the NH3 + moiety in iron(III)-, aluminium(III)- and gallium(III)-aminohydroxamate interactions

AU - Farkas, E.

AU - Kozma, Emese

AU - Kiss, T.

AU - Tóth, Imre

AU - Kurzak, Barbara

PY - 1995

Y1 - 1995

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=37049087535&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37049087535&partnerID=8YFLogxK

U2 - 10.1039/DT9950000477

DO - 10.1039/DT9950000477

M3 - Article

SP - 477

EP - 481

JO - Dalton Transactions

JF - Dalton Transactions

SN - 1472-7773

IS - 3

ER -