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. Author manuscript; available in PMC: 2011 Dec 8.
Published in final edited form as: Chem Rev. 2010 May 5;110(12):7002–7023. doi: 10.1021/cr100023g

Figure 7.

Figure 7

Collinear and orthogonal PCET. In collinear PCET, proton and electron transfer to the same acceptor site (A). In orthogonal or bidirectional PCET, proton and electron transfer to two different acceptor sites, X (electron acceptor) and A (proton acceptor).