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On The Electron Transfer Mechanism Between Cytochrome C And Metal Electrodes. Evidence For Dynamic Control At Short Distances.

Hongjun Yue, D. Khoshtariya, D. Waldeck, J. Grochol, P. Hildebrandt, D. Murgida
Published 2006 · Medicine, Chemistry

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Cytochrome c was coordinatively bound to self-assembled monolayers of pyridine-terminated alkanethiols on Au and Ag electrodes. The mechanism of heterogeneous electron transfer of the immobilized protein was investigated by cyclic voltammetry and time-resolved surface-enhanced resonance Raman spectroelectrochemistry. The temperature, distance, and overpotential dependencies of the electron transfer rates indicate a change of mechanism from a tunneling controlled reaction at long distances (thicker films) to a solvent/protein friction controlled reaction at smaller distances (thinner films).



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