A novel dinuclear species in the aqueous distribution of aluminum in the presence of citrate

Maria Dakanali, Catherine P. Raptopoulou, Aristidis Terzis, Andrea Lakatos, Istvan Banyai, Tamas Kiss, Athanasios Salifoglou

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Abstract

The chemistry of aluminum was explored in the presence of the physiological ligand citric acid and in low-pH aqueous media. As a result, the first dinuclear aluminum-citrate complex (NH4)4[Al2-(C6 H4O7)(C6H5 O7)2]·4H2O was isolated at low pH (∼3.5), and was characterized by FT-IR spectroscopy and X-ray crystallography. The structural analysis reveals the presence of a dinuclear assembly of two aluminum ions octahedrally coordinated to three citrate ligands of differing protonation state. The NMR solution behavior of this complex emphasizes its time-dependent transformation into a number of variable nature species, ultimately leading to the thermodynamically stable trinuclear species. It also establishes the participation of the dinuclear complex as a viable component of the aqueous AI(III)-citrate speciation. The chemical and structural features of this novel low molecular mass species provide considerable insight into citrate's ability, as a natural ligand, to influence the chemistry of aluminum in a pH-dependent fashion, and potentially affect aluminum's (bio)distribution, absorption, accumulation, and biotoxicity at sensitive biological sites.

Original languageEnglish (US)
Pages (from-to)252-254
Number of pages3
JournalInorganic Chemistry
Volume42
Issue number2
DOIs
StatePublished - Jan 27 2003

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citrates
Aluminum
Citric Acid
aluminum
Ligands
ligands
Protonation
X ray crystallography
chemistry
Molecular mass
Structural analysis
citric acid
Infrared spectroscopy
structural analysis
Nuclear magnetic resonance
crystallography
Ions
assembly
nuclear magnetic resonance
spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Dakanali, M., Raptopoulou, C. P., Terzis, A., Lakatos, A., Banyai, I., Kiss, T., & Salifoglou, A. (2003). A novel dinuclear species in the aqueous distribution of aluminum in the presence of citrate. Inorganic Chemistry, 42(2), 252-254. https://doi.org/10.1021/ic0258025

A novel dinuclear species in the aqueous distribution of aluminum in the presence of citrate. / Dakanali, Maria; Raptopoulou, Catherine P.; Terzis, Aristidis; Lakatos, Andrea; Banyai, Istvan; Kiss, Tamas; Salifoglou, Athanasios.

In: Inorganic Chemistry, Vol. 42, No. 2, 27.01.2003, p. 252-254.

Research output: Contribution to journalArticle

Dakanali, M, Raptopoulou, CP, Terzis, A, Lakatos, A, Banyai, I, Kiss, T & Salifoglou, A 2003, 'A novel dinuclear species in the aqueous distribution of aluminum in the presence of citrate', Inorganic Chemistry, vol. 42, no. 2, pp. 252-254. https://doi.org/10.1021/ic0258025
Dakanali, Maria ; Raptopoulou, Catherine P. ; Terzis, Aristidis ; Lakatos, Andrea ; Banyai, Istvan ; Kiss, Tamas ; Salifoglou, Athanasios. / A novel dinuclear species in the aqueous distribution of aluminum in the presence of citrate. In: Inorganic Chemistry. 2003 ; Vol. 42, No. 2. pp. 252-254.
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