Electron transfer of some redox systems through physisorbed 4-methylesculetin: A catalytic behavior toward oxidation of catechols

► Electrochemical oxidation of 4-methylesculetin. ► Homogeneous and heterogeneous electron transfer through the physisorbed 4-methylesculetin. ► Catalytic electron transfer of catechol through the physisorbed layer of 4-methylesculetin. ► Tunneling electron transfer of Fe(CN)64- through the monolayer of 4-methylesculetin.