Electron transfer between cytochrome c and metal hexacyanide complexes. Effect of thermodynamic driving force on the electron transfer rate

Biochim Biophys Acta. 1989 Jan 26;973(1):53-8. doi: 10.1016/s0005-2728(89)80402-5.

Abstract

The electron transfer reactions between ferrocytochrome c and three isomorphic hexacyanide complexes, [Fe(CN)6]3-, [Os(CN)6]3- and [Ru(CN)6]3-, have been studied using the method of photoexcitation. The transfer rates for [Os(CN)6]3- and [Ru(CN)6]3- are, respectively, about 45- and 200-times higher than that of [Fe(CN)6]3-. A reorganization energy of approx. 0.8 eV was found for the cytochrome c-hexacyanide system when the data were analyzed according to the theory of Marcus.

MeSH terms

  • Cyanides / metabolism*
  • Cytochrome c Group / metabolism*
  • Electron Transport*
  • Ferricyanides / metabolism*
  • Free Radicals
  • Kinetics
  • Osmium / metabolism*
  • Osmium Compounds*
  • Osmolar Concentration
  • Oxidation-Reduction
  • Photolysis
  • Ruthenium / metabolism*
  • Ruthenium Compounds*
  • Spectrophotometry
  • Superoxides / metabolism
  • Thermodynamics

Substances

  • Cyanides
  • Cytochrome c Group
  • Ferricyanides
  • Free Radicals
  • Osmium Compounds
  • Ruthenium Compounds
  • osmium hexacyanide
  • Superoxides
  • hexacyanoferrate III
  • ruthenium hexacyanide
  • Osmium
  • Ruthenium