because they can bypass high-energy intermediates present in sequential PT and ET steps and generally occur with lower reaction barriers ( . Pathway i Pathway ii Figure 3.4. (a) Pathway i depicts an initial electron transfer to MM cation followed by a sequential PT-ET to CO2. (b) Pathway ii (proposed in this work) depicts the concerted mechanism in which a bidirectional ET (form Au electrode) and PT (from C2-proton of MM cation) leads to a lower energy barrier. c, shows a schematic of the energy diagram for step-wise and concerted pathways.
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