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Excited-state PCET systems where the protonatable moiety is the (a) 4,4′-bipyridine or (b) pyridylbenzimidazole ligand. Panel a reprinted from ref (213). Copyright 2013 American Chemical Society. Panel b reprinted with permission from ref (391). Copyright 2011 Wiley-VCH Verlag GmbH & Co. KGaA.
