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Title
| - Cyclic Voltammetric and Scanning ElectrochemicalMicroscopic Study of Menadione Permeability through aSelf-Assembled Monolayer on a Gold Electrode
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Abstract
| - Menadione (2-methyl-1,4-naphthoquinone) reduction and menadiol oxidation at octadecanethiol(C18SH) monolayer modified gold electrodes were investigated by cyclic voltammetry (CV) and scanningelectrochemical microscopy (SECM). The modified electrode acts as a better barrier toward the ferrocyanidetransport than toward the menadione species. This difference is attributed to permeation of the organicsubstrates into the hydrophobic monolayer. A simple model is proposed and applied to extract the rateconstant of the kinetically limiting permeation step from the cyclic voltammograms. However, a betterestimate of the transport properties is obtained by SECM. The same trends are observed with CV andSECM, and a similar pH dependence shows the loss of an intermediate formed during menadione reductionfrom the monolayer with increasing pH. This loss can probably be assigned to the rapid expulsion of themore hydrophilic reduced species from the monolayer.
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