In the experiment shown in Figure , 𝐴 𝑛 𝐶 at 289 nm remains close to 0 during all experiment, confirming that this absorption band corresponds to a soluble oxidation product formed during oxidation of TDMQ20 (Figure , blue dotted line). While for 261 nm, the band corresponding to TDMQ20, a distinctly different behavior is observed, Figure . When the absorbance is corrected (Figure , blue solid line), a clear evolution of the voltabsorptogram corresponding to the corrected absorbance, 𝑉𝐴 𝑛 𝐶 , at 261 nm is observed, which is related to the electrochemical oxidation. This indicates that parallel configuration registers the conversion of the TDMQ20 to a soluble oxidation product absorbs at different wavelength than TDMQ20, while in normal configuration not only this soluble product is observed, but also the generation of an insoluble product which absorbs at the same wavelength as the TDMQ20. This agrees with our hypothesis, meaning that during oxidation of TDMQ20, part of the oxidised product is chemisorbed on the WE, probably by covalent interaction between the electrode and the N-containing groups of the aliphatic chain of TDMQ20.