C. Blanco, J. M. Romero, J. Verdu
Dec 1, 1993
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0
Influential Citations
3
Citations
Journal
International Journal of Chemical Kinetics
Abstract
The kinetics and mechanism of the reaction of complexation of iron(III) with 2,4-octanedione and 2,4-nonanedione have been investigated spectrophotometrically in aqueous solution at 10°C and ionic strength 0.5 mol dm−3 NaClO4. The equilibrium constants of the mono-complexes have been determined. The mechanism proposed to account for the kinetic data involves a double reversible pathway where both Fe3+ and Fe(OH)2+ react with the enol tautomer of the ligand. 2,4-Octanedione reacts with Fe3+ and Fe(OH)2+ with rate constants of 0.65 dm3 mol−1 s−1, and 14.07 dm3 mol−1 s−1, respectively. For 2,4-nonanedione complexation the rate constants determined are 0.49 dm3 mol−1 s−1, and 11.39 dm3 mol−1 s−1, respectively. Some discussions are made on the basis of Eigen-Wilkins theory considering the effect of solvent exchange on the complex formation. © 1993 John Wiley & Sons, Inc.