Abstract
2-Dimensional amperometry” using arrays of gold channel microband electrodes is applied to the oxidation of 2,3,7,8-tetramethoxythianthrene (TMT) and to the characterization of the follow-up kinetics of the resulting radical cation with pyridine. In the absence of pyridine the reaction is consistent with an E mechanism and a value of 1.3 × 10−5 cm2 s−1 is obtained for the diffusion coefficient of TMT. In the presence of pyridine the experimental results are consistent with a DISP2 mechanism where the values of the rate constant have a first order dependence on the concentration of pyridine. The following mechanism is proposed: and a value of 5.8 × 104 M−2s−1 is found for the rate constant for the regeneration of TMT.
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