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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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