Evidence against the hopping mechanism as an important electron transfer pathway for conformationally constrained oligopeptides.

Federico Polo, Sabrina Antonello, Fernando Formaggio, Claudio Toniolo, Flavio Maran

Index: J. Am. Chem. Soc. 127(2) , 492-3, (2005)

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Abstract

The rate constant of intramolecular electron transfer through oligopeptides based on the alpha-aminoisobutyric acid residue was determined as a function of the peptide length and found to depend weakly on the donor-acceptor separation. By measuring the electron-transfer activation energy and estimating the energy gap between donor and bridge, we were able to discard the electron hopping mechanism.