“…When O 2 is excluded from the CH 2 Cl 2 electrolyte, G is electrochemically oxidized as radical cation 1 [47], which is presented in Scheme 1. It is noted that the oxidation potential of DNA-CTMA under N 2 is nearly the same as that under O 2 in aqueous NaOH electrolyte, where the deprotonation and oxidation by oxygen of G in NaOH can also produce radical 3 which is oxidized at the potential of 0.5 V. [48][49][50] Based on the experimental results, we propose that the resonance structure of G, 2 which has the delocalized electron over the base is sensitive to the O 2 oxidation.…”