Abstract
The adsorption behavior of N, N′-dialkyl-4,4′-bipyridinium dications (viologens) on hanging mercury electrode surfaces was investigated as a function of the alkyl chain length (C n V 2+, n = 1–8). Monolayer adsorbed viologens give a pair of very narrow spike-like peaks on cyclic voltammograms, which can be attributed to the redox electrode reaction. The peak location was found to depend on both the alkyl chain length and the bulk concentration, and is shifted to a more positive potential with increasing chain length. These facts suggest strongly that the lateral interaction between alkyl chains of viologen molecules plays an important role in the stabilization of the structure of adsorbed layers.
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