Complexation of molybdenum(VI) with bis(3-hydroxy-4-pyridinone)amino acid derivatives

M. Amélia Santos, Sofia Gama, João Costa Pessoa, M. Conceição Oliveira, Imre Tóth, E. Farkas

Research output: Contribution to journalArticle

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Abstract

The molybdenum(VI) binding properties of a series of 3-hydroxy-2-methyl-4- pyridinones (3,4-HP), namely bis(3,4-HP) chelators, were investigated in solution and as solids; in particular, the complexation of MoVI with iminobis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, IDAPr-(3,4-HP)2, and ethylenediamino-N,N'-bis(methylcarboxyl)-N,N'- bis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, EDTAPr(3,4-HP)2, as well as three model compounds: 1,2-dimethyl-3-hydroxy-4-pyridinone (DFP), iminodiacetic acid (IDA), and ethylenediaminodiacetic acid (EDDA). Solution studies show that the complexation occurs at low pH values by the coordination modes of the hydroxypyridinone moiety, and with the formation of bischelated MoO2 2+ species. As the pH is increased, hydrolytic processes start with the formation of monochelated MoO3 complexes and is followed by the total recovery of the free ligand, at pH > 8 for most of the systems, but at pH 10 for EDTAPr-(3,4-HP)2. The obtained solid molybdenum complexes showed evidence for the presence of mononuclear species in solution, whereas the dinuclear species, (MoO2)2EDT-APr(3,4-HP)2, were only detected for the EDTA derivative. Aqueous solution studies were performed by pH-potentiometry, spectrophotometry, 1H NMR and 17O NMR spectroscopy, and solid complex species were characterized by elemental analysis, IR spectroscopy, and ESI-MS.

Original languageEnglish
Pages (from-to)1728-1737
Number of pages10
JournalEuropean Journal of Inorganic Chemistry
Issue number12
DOIs
Publication statusPublished - 2007

Fingerprint

Pyridones
Molybdenum
Complexation
Derivatives
Amino Acids
Isoflurophate
Spectrophotometry
Chelating Agents
Edetic Acid
Nuclear magnetic resonance spectroscopy
Infrared spectroscopy
Nuclear magnetic resonance
Ligands
Recovery
Acids
Chemical analysis
ethylenodiamino-N,N'-bis(acetocarboxyl)-N,N'-bis(acetyl(1-(3'-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone))
1-(3'-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone

Keywords

  • Chelates
  • Hydroxypyridinonate complexes
  • Hydroxypyridinones
  • Molybdenum

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Complexation of molybdenum(VI) with bis(3-hydroxy-4-pyridinone)amino acid derivatives. / Santos, M. Amélia; Gama, Sofia; Pessoa, João Costa; Oliveira, M. Conceição; Tóth, Imre; Farkas, E.

In: European Journal of Inorganic Chemistry, No. 12, 2007, p. 1728-1737.

Research output: Contribution to journalArticle

Santos, M. Amélia ; Gama, Sofia ; Pessoa, João Costa ; Oliveira, M. Conceição ; Tóth, Imre ; Farkas, E. / Complexation of molybdenum(VI) with bis(3-hydroxy-4-pyridinone)amino acid derivatives. In: European Journal of Inorganic Chemistry. 2007 ; No. 12. pp. 1728-1737.
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AU - Santos, M. Amélia

AU - Gama, Sofia

AU - Pessoa, João Costa

AU - Oliveira, M. Conceição

AU - Tóth, Imre

AU - Farkas, E.

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N2 - The molybdenum(VI) binding properties of a series of 3-hydroxy-2-methyl-4- pyridinones (3,4-HP), namely bis(3,4-HP) chelators, were investigated in solution and as solids; in particular, the complexation of MoVI with iminobis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, IDAPr-(3,4-HP)2, and ethylenediamino-N,N'-bis(methylcarboxyl)-N,N'- bis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, EDTAPr(3,4-HP)2, as well as three model compounds: 1,2-dimethyl-3-hydroxy-4-pyridinone (DFP), iminodiacetic acid (IDA), and ethylenediaminodiacetic acid (EDDA). Solution studies show that the complexation occurs at low pH values by the coordination modes of the hydroxypyridinone moiety, and with the formation of bischelated MoO2 2+ species. As the pH is increased, hydrolytic processes start with the formation of monochelated MoO3 complexes and is followed by the total recovery of the free ligand, at pH > 8 for most of the systems, but at pH 10 for EDTAPr-(3,4-HP)2. The obtained solid molybdenum complexes showed evidence for the presence of mononuclear species in solution, whereas the dinuclear species, (MoO2)2EDT-APr(3,4-HP)2, were only detected for the EDTA derivative. Aqueous solution studies were performed by pH-potentiometry, spectrophotometry, 1H NMR and 17O NMR spectroscopy, and solid complex species were characterized by elemental analysis, IR spectroscopy, and ESI-MS.

AB - The molybdenum(VI) binding properties of a series of 3-hydroxy-2-methyl-4- pyridinones (3,4-HP), namely bis(3,4-HP) chelators, were investigated in solution and as solids; in particular, the complexation of MoVI with iminobis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, IDAPr-(3,4-HP)2, and ethylenediamino-N,N'-bis(methylcarboxyl)-N,N'- bis{acetyl[1-(3′-aminopropyl)-3-hydroxy-2-methyl-4-pyridinone]}, EDTAPr(3,4-HP)2, as well as three model compounds: 1,2-dimethyl-3-hydroxy-4-pyridinone (DFP), iminodiacetic acid (IDA), and ethylenediaminodiacetic acid (EDDA). Solution studies show that the complexation occurs at low pH values by the coordination modes of the hydroxypyridinone moiety, and with the formation of bischelated MoO2 2+ species. As the pH is increased, hydrolytic processes start with the formation of monochelated MoO3 complexes and is followed by the total recovery of the free ligand, at pH > 8 for most of the systems, but at pH 10 for EDTAPr-(3,4-HP)2. The obtained solid molybdenum complexes showed evidence for the presence of mononuclear species in solution, whereas the dinuclear species, (MoO2)2EDT-APr(3,4-HP)2, were only detected for the EDTA derivative. Aqueous solution studies were performed by pH-potentiometry, spectrophotometry, 1H NMR and 17O NMR spectroscopy, and solid complex species were characterized by elemental analysis, IR spectroscopy, and ESI-MS.

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