SEARCH Articles Figures Tables 2 -Electron-2 -proton transfer Complex Coupling Copper complexes electron transfer Copper couples Copper electron transfer Electron coupled Electron coupled transfers Electron coupling Electron proton Electron protonation Electron transfer complexation Electron transfer coupling Electron transfer electronic coupling Electron-proton coupling Electron-transfer complexes Electronic coupling Proton complexes Proton coupled electron transfer Proton coupling Proton transfer complexes Proton transfer coupled Proton-coupled electron transfer complexes Protonated complex