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

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. © 1989 Elsevier Science Publishers B.V. (Biomedical Division) All rights reserved.link_to_subscribed_fulltex