Examples of complex mechanisms commonly encountered in organic electrochemistry

EXAMPLES OF COMPLEX MECHANISMS COMMONLY ENCOUNTERED IN ORGANIC ELECTROCHEMISTRY 

A very common electrode reaction mechanism encountered in organic electrochemistry is the ECE mechanism. As discussed in Section 2, with this mechanism, a species generated by heterogeneous electron transfer at the 

On continuous cycling of the potential through the two reduction processes, the magnitude of the current associated with the first reduction process gradually drops whereas that due to the second process increases. This behaviour is expected for an ECE process in which the p-iodonitrobenzene is reduced irreversibly to the nitrobenzene radical anion. Further, the addition of iodide anions to the solution decreases the rate of formation of nitrobenzene as evidenced by noting that the rate at which the peak current associated with the p-iodonitrobenzene reduction decreases less rapidly on successive scans through both reduction processes. The dependence on the iodide concentration in bulk solution suggests that the C step of the ECE mechanism actually consisted of processes (51) and (52), 

Obviously, it is possible that the chemical step in an ECE mechanism is second order i.e. an EC2E mechanism. The oxidation of 3-mercaptopropionic acid (RSH) shown in (53)-(55) provides such an example (Forlano et al.. 

Cyclic voltammetric simulation techniques were used to examine quantitatively the kinetics of the dimerization step and the rate constant was found to be in the range of (1.7-2.0) X 10 moC dm s .  

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Examples of complex mechanisms commonly encountered in organic electrochemistry 38... 

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