Abstract
For the anodic cyclization of tetraphenylethylene (TPE) forming 9,10-diphenylphenanthrene mainly three mechanisms have to be considered: (1) the ECE mechanism, (2) the half-regeneration mechanism, and (3) the disproportionation mechanism. The electrogeneration of the tetraphenylethylene radical cation (TPE + ) at an optically transparent electrode (platinum on Pyrex) allows to simultaneously follow the reactive species spectroscopically through the electrode itself. The absorbance of TPE + at 486.5 nm corresponds to the integration of the concentration profile of the intermediate in solution. The comparison of the absorbance-time behaviour of TPE + during chronoamperometric generation and open circuit relaxation with digitally simulated working curves for the three possible mechanisms proves that the concentration of TPE + follows the rate law of the disproportionation mechanism: ▪
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