Journal
CHEMPHYSCHEM
Volume 8, Issue 9, Pages 1321-1329Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200600774
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Electron transfer inside self-assembled monolayers made from complex redox-active oligophenylenevinylene molecular wires is examined by ultrafast cyclic voltammetry, Rote constants above 70(6) s(-1) are measured when the electroactive moieties are easily accessible to counterions from the electrolyte. These counterion movements are necessary to compensate the local charge created upon electron transfer. Conversely, if the redox center is buried within long hydrophobic diluents, the counterion movement towards the redox entity becomes rate limiting, thus drastically altering the rote magnitude and its physical meaning. This change in the mechanism is examined both for superexchange or when one electron-hopping step is involved.
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