Evidence Against the Hopping Mechanism as an Important Electron Transfer Pathway for Conformationally Constrained Oligopeptides

ArticleinJournal of the American Chemical Society 127(2):492-3 · February 2005with9 Reads
Impact Factor: 12.11 · DOI: 10.1021/ja043607e · Source: PubMed

    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.