Pentacyanoiron(III) pyridine derivatives as topological probes for electron transfer cytochrome C

T. V. O'Halloran*, J. M. Malin

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The kinetics of oxidation of ferrocytochrome C by a series of substitute pentacyano(pyridine) iron(III) complexes is studied in an aqueous solution at 23°C, pH 7.2, μ = 0.10 mol/l (KCl). Second-order rate constants for the complexes of pyridine, 4-methylpyridine, isonicotinamide, 4-phenylpyridine, and 4-tert-butylpyridine are, respectively, (6.0 ± 0.7) × 107, (1.7 ± 0.3) × 107, (5.7 ± 1.5) × 107, (8.2 ± 0.8) × 107, and (2.8 ± 0.3) × 107 l mol-1 s-1. For the same series of oxidants, the specific rates of the reaction with the aqueous ferrocyanide ion are, respectively, (1.7 ± 0.1) × 105, (5.5 ± 0.2) × 104, (2.8 ± 0.1) × 105, (5.5 ± 0.1) × 104, and (1.9 ± 0.1) × 104 l mol-1 s-1. The results a interpreted in terms of the steric and hydrophobic influences of the 4-pyridine substituents on the stability of the precursor complexes to electron transfer.

Original languageEnglish (US)
Pages (from-to)676-682
Number of pages7
JournalKinetics and Catalysis
Volume37
Issue number5
StatePublished - Sep 1 1996

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Modeling and Simulation
  • Computer Science Applications

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