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(A) Square scheme representation of PCET mechanisms available for the cleavage of an E–H bond. The stepwise transfer of electrons and protons are shown on the edges of the square. The concerted transfer of the electron and proton via concerted PCET is shown along the diagonal. (B) Reaction coordinate of stepwise vs concerted PCET mechanisms. Stepwise PCET generates high-energy charged intermediates which are avoided in a concerted PCET pathway.
