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.
Cho
K C
KC
Department of Physics, Chinese University of Hong Kong.
Chu
W F
WF
Choy
C L
CL
Che
C M
CM
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
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