The reaction of iron(III) with chromium(III)-DTPA 'chelating agent' has been investigated, in aqueous solution, by measuring both hydrogen ion concentration and emf of the iron(III)/iron(II) couple. In acidic medium (pH < 2.3) and with ligand excess, a 1:1 (metal-ligand molar ratio) fully deprotonated complex has been evidenced. In the same experimental conditions the iron(III) reacts with iminodiacetic acid forming a similar 1:1 deprotonated species. The stability constants of the above equilibria have been calculated at 20<degrees>C in NaClO4 1.0 mol dm(-3). The comparison of these constants, considering the basicity of the ligands, proved the coordination of iron(III) occurs by one iminodiacetic group. The iron(III)-chromium(III)-DTPA complex has been precipitated and the solid compound characterized by IR and thermoanalytical techniques.

On the reaction of iron(III) with chromium(III)-DTPA chelating agent / Bucci, Remo; Magri', Andrea; Magri', Antonio; Napoli, Aldo. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 19:24-25(2000), pp. 2421-2425. [10.1016/S0277-5387(00)00540-4]

On the reaction of iron(III) with chromium(III)-DTPA chelating agent

BUCCI, Remo;MAGRI', Andrea;MAGRI', Antonio;NAPOLI, Aldo
2000

Abstract

The reaction of iron(III) with chromium(III)-DTPA 'chelating agent' has been investigated, in aqueous solution, by measuring both hydrogen ion concentration and emf of the iron(III)/iron(II) couple. In acidic medium (pH < 2.3) and with ligand excess, a 1:1 (metal-ligand molar ratio) fully deprotonated complex has been evidenced. In the same experimental conditions the iron(III) reacts with iminodiacetic acid forming a similar 1:1 deprotonated species. The stability constants of the above equilibria have been calculated at 20C in NaClO4 1.0 mol dm(-3). The comparison of these constants, considering the basicity of the ligands, proved the coordination of iron(III) occurs by one iminodiacetic group. The iron(III)-chromium(III)-DTPA complex has been precipitated and the solid compound characterized by IR and thermoanalytical techniques.
2000
iron(III); chromium(III); DTPA; complexes; thermal properties; thermodynamics
01 Pubblicazione su rivista::01a Articolo in rivista
On the reaction of iron(III) with chromium(III)-DTPA chelating agent / Bucci, Remo; Magri', Andrea; Magri', Antonio; Napoli, Aldo. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 19:24-25(2000), pp. 2421-2425. [10.1016/S0277-5387(00)00540-4]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/253379
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