Kinetics and mechanism of the complexing of Fe(III) by 2,3-dihydroxybenzoic acid

Abstract

The kinetics and mechanism for complexing of aqueous Fe(III) by 2,3-dihydroxybenzoic acid (I) were studied in 1.00 mol.dm-3 ionic strength with [H+]1.00 ?10-2 to 0.700 mol.dm-3, and [Fe(III)]/[I] ?10. The rate constants for complexing of FeOH23+, FeOH2+ and Fe2(OH)4+ by I were measured and calculated The activation enthalpy and entropy decrease with increasing [H+]. This indicates an associative mechanism for FeOH23+ and a dissociative mechanism for FeOH2+ and Fe2(OH)24+. The reaction rate equation shows the H+ dependence typical for Fe(III) complexation, but there is an unusual contribution from a kinetic term 2nd order in [Fe(III)]. A possible mechanism is proposed.

Key words: REACTION MECHANISM, REACTION KINETICS, IRON COMPLEX, DIHYDROXYBENZOIC ACID, COMPLEX REACTION

CLC Number:

O627

Cite this article

XU JIN. Kinetics and mechanism of the complexing of Fe(III) by 2,3-dihydroxybenzoic acid[J]. Acta Chimica Sinica, 1989, 47(4): 367-371.

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