Unusual Electron Tunneling Constant for Long Range Electron Transfer in Hydroquinone (H_2Q)-termmated Self-Assembled Monolayers on Gold in Alkaline Solution

摘要

In order to study the interfacial electron transfer,self-assembled monolayers (SAMs) on electrode surface have been attractive as a model system because they provide a stable and structurally well-defined monolayer with an adjustable thickness and desirable function.This characteristic of SAMs affords an opportunity to study fundamental issues such as the effects of distance and interfacial structure on the long-range electron transfer kinetics between a redox active species and an electrode.Weaver and Li~2 obtained the first evidence of the distance-dependence of heterogeneous electron transfer rate constant for reduction of pentaamine-cobalt(III) complexes anchored to gold and mercury surface.