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Electron Transfer Mechanism in Helical Peptides
Author(s):
Himadri Shekhar Mandal, Heinz-Bernhard Kraatz
Journal:
The Journal of Physical Chemistry Letters
Year:
2012
Volume:
3
Pages
709–713
DOI:
10.1021/jz300008s
Abstract:
Electrochemical studies of a set of ferrocene-labeled helical peptides of increasing length were carried out by forming self-assembled monolayers (SAMs) on gold electrodes. Electron transfer (ET) rates showed a very weakly distance dependent nature that has been interpreted as a result of a dynamically controlled tunneling mechanism. Specifically, the slow equilibrium between the α- and the 310 helical conformers in a SAM has been invoked, and the rate of formation of the more conductive 310 conformer has been proposed to be related to the ET rates observed.
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