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On the electron transfer mechanism between cytochrome c and metal electrodes. Evidence for dynamic control at short distances
Citation key ISI:000241053400021
Author Yue, Hongjun and Khoshtariya, D. and Waldeck, D. H. and Grochol, J. and Hildebrandt, P. and Murgida, D. H.
Pages 19906-19913
Year 2006
ISSN 1520-6106
DOI 10.1021/jp0620670
Address 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Journal J. Phys. Chem. B
Volume 110
Number 40
Month OCT 12
Publisher AMER CHEMICAL SOC
Abstract 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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