Electrochemical Evidence for the Affinity of N-alkyl Sulfonate Group-modified Viologens to Gold
The cyclic voltammograms of n-alkyl sulfonate-group modified viologens on glassy carbon and platinum electrodes are similar to those of dimethyl and di-n-heptyl viologen; on gold electrodes, however, the new species demonstrate a new surface wave whose size depends on the concentration of the n-alkyl sulfonate group-modified viologen in the electrolyte. The saturation coverage is calculated at 7.3 × 10 -10 and at 9.4 × 10 -10 mol cm -2 for N-methyl-N' -(3-sulfonato-n-propyl)-4,4'-bipyridinium iodide (I) and for N-(n-heptyl)-N'-(3-sulfonato-n-propyl)-4,4'-bipyridinium iodide (II), respectively, suggesting formation of a monolayer with the viologen moieties configured normal to the gold electrode surface.
N. Leventis et al., "Electrochemical Evidence for the Affinity of N-alkyl Sulfonate Group-modified Viologens to Gold," Journal of the Electrochemical Society, The Electrochemical Society (ECS), Jan 1997.
The definitive version is available at http://dx.doi.org/10.1149/1.1838077
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