title: Electron transfer between cytochrome c and metal hexacyanide complexes. Effect of thermodynamic driving force on the electron transfer rate.
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.
authors.affiliation: Department of Physics, Chinese University of Hong Kong.
authors.forename: K C
authors.initials: KC
authors.lastname: Cho
authors.forename: W F
authors.initials: WF
authors.lastname: Chu
authors.forename: C L
authors.initials: CL
authors.lastname: Choy
authors.forename: C M
authors.initials: CM
authors.lastname: Che
mesh_terms: D003486:Cyanides / Q000378:metabolism*; D003574:Cytochrome c Group / Q000378:metabolism*; D004579:Electron Transport; D005292:Ferricyanides / Q000378:metabolism*; D005609:Free Radicals; D007700:Kinetics; D009992:Osmium / Q000378:metabolism*; D017892:Osmium Compounds; D009994:Osmolar Concentration; D010084:Oxidation-Reduction; D010782:Photolysis; D012428:Ruthenium / Q000378:metabolism*; D017975:Ruthenium Compounds; D013053:Spectrophotometry; D013481:Superoxides / Q000378:metabolism; D013816:Thermodynamics
chemical_list: D003486:Cyanides; D003574:Cytochrome c Group; D005292:Ferricyanides; D005609:Free Radicals; D017892:Osmium Compounds; D017975:Ruthenium Compounds; C058488:osmium hexacyanide; D013481:Superoxides; C007931:hexacyanoferrate III; C042145:ruthenium hexacyanide; D009992:Osmium; D012428:Ruthenium