Fig. 9. Schematic zone diagram for a PCET oxidation of a compound HA to A˙, where the reaction exhibits a sufficiently large vibronic coupling that CEPT can compete in this range of ΔE° and ΔpKa values. The axes are defined as ΔE° = E°(oxidant) − E°(HA˙+/HA) (in units of volts) and ΔpKa = pKa(H+ base) − pKa(HA), so that the overall driving force for PCET increases when moving upwards and to the right in the diagram. Adapted with permission from ref. 1. Copyright © 2021 American Chemical Society.
