PCet
Proton-Coupled Electron Transfer (PCET) is a class of chemical reactions in which a proton and an electron are transferred between donors and acceptors in a coupled fashion. PCET processes can proceed through either a concerted mechanism, in which the proton and electron move in a single kinetic step, or through a stepwise sequence in which proton transfer occurs before or after electron transfer (PT-ET or ET-PT). PCET encompasses hydrogen-atom transfer (HAT) as a special case, but it also covers broader coupled transfers where the proton and electron move between different sites or in different solvent environments.
The driving forces in PCET are the redox potential and the acid-base properties of the proton donor
PCET is central to many biological and chemical processes. In biology, it governs charge transfer in photosynthesis
Experimental and computational studies continue to refine the understanding of PCET mechanisms, energetics, and practical applications