Abstract
The electroreduction mechanism of dioctadecylviologen (V2+) incorporated in a self-assembled dioleoylphosphatidylcholine (DOPC) monolayer supported on a mercury electrode has been investigated in aqueous 0.1 M KCl by chronocoulometry and other electrochemical techniques. V2+ is reduced in two consecutive charge steps, 2V2+ + 3e → V2+ and V2+ + e → 2V0, involving 3/2 and 1/2 of a Faraday per mole of reactant, respectively. Both charge steps are exclusively controlled by the rate of the elementary coupling step V+ + V0 → V2+. V2+ acts as an electron transfer mediator from Fe(CN)63- dissolved in the aqueous solution to the mercury surface across the DOPC monolayer, which is impermeable to Fe(CN)63- in the absence of V2+. This mediation takes place only along the first charge step, 2V2+ + 3e → V2+ and increases with the V2+ concentration in the lipid monolayer less than proportionally; this behavior points to the radical cation V+ as the electron transfer mediator from the mercury surface to the aqueous ferricyanide.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
