Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 40, Pages 19906-19913Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0620670
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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 spectroelectro-chemistry. 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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