By Joseph Wang
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Such six successive reduction peaks are observed in Figure 2-4. The situation is very different when the redox reaction is slow or coupled with a chemical reaction. Indeed, it is these "nonideal" processes that are usually of greatest chemical interest and for which the diagnostic power of cyclic voltammetry is most useful. 0 + Potential (V vs Fc/Fc ) FIGURE 2-4 Cyclic voltammetry of C60 and C70 in an acetonitrile-toluene solution. ) voltammograms with those derived from theoretical (simulated) ones (1).
Multiple electron transfer with intervening chemical reaction—ECE mechanism O + n^- ^ R R ^Y Y + n2e~ ^ Z Adapted with permission from reference 88. been developed (9). Such simulated voltammograms can be compared with and fitted to the experimental ones. The new software also provides movie-like presentations of the corresponding continuous changes in the concentration profiles. 3 Study of Adsorption Processes Cyclic voltammetry can also be used for evaluating the interfacial behavior of electroactive compounds.
3 Other Spectroelectrochemical and Spectroscopic Techniques In addition to UV-visible absorption measurements, other spectroscopic techniques can be used for monitoring the dynamics of electrochemical events or the fate of electrogenerated species. Particularly informative are the couplings of electrochemistry with electron spin resonance, nuclear magnetic resonance, and mass spectroscopy. A variety of specially designed cells have been constructed to facilitate such studies, and several reviews have been published (32-36).
Analytical Electrochemistry by Joseph Wang