| Abstract
| - In aqueous mixed media containing DMSO in fractions by volume above 0.50 the cation radical of heptylviologen (HV•+) can be absorbed in two different orientations on a mercury electrode. Thus, the cationradical can take a planar conformation relative to the surface; however, depending on the applied potential,it can reorient itself to adopt a different conformation where the bipyridine group lies normal to or at anangle with the electrode. In this work, the reorientation was found to take place via a two-dimensionalphase transition mechanism. The experimental conditions under which the phenomenon occurs are analyzed.
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