Jump to main content
Jump to site search

Issue 3, 1986
Previous Article Next Article

Redox reactions of some iron(II), iron(III), and cobalt(II) picolinate complexes

Abstract

The kinetics of reduction of iron(III) in pyridine-2-carboxylate, picolinate (pic), solutions by ascorbate ion show a complex dependence upon pH, ligand concentration, and reductant concentration. The data analysis reveals a single redox-active species, [Fe(pic)2(OH)], which is reduced by ascorbate ion with a second-order rate constant of 6.4 × 103 dm3 mol–1 s–1 at 25 °C and I= 0.10 mol dm–3. This species is in rapid equilibrium with [Fe(pic)3], and the equilibrium constant between the two species is evaluated. Oxidations of iron(II) in picolinate solutions by [Co(pic)3] and [Co(ox)3]3–[ox = oxalate(2–)] reveal a dominant pathway involving [Fe(pic)2] and a minor pathway involving [Fe(pic)3]. It is suggested that these are outer-sphere processes and Marcus theory is used to estimate self-exchange rates for the complexes.

Back to tab navigation

Article type: Paper
DOI: 10.1039/DT9860000619
Citation: J. Chem. Soc., Dalton Trans., 1986,0, 619-624
  •   Request permissions

    Redox reactions of some iron(II), iron(III), and cobalt(II) picolinate complexes

    A. M. Lannon, A. G. Lappin and M. G. Segal, J. Chem. Soc., Dalton Trans., 1986, 0, 619
    DOI: 10.1039/DT9860000619

Search articles by author

Spotlight

Advertisements