The Amidinium–Carboxylate Salt Bridge as a Proton‐Coupled Interface to Electron Transfer Pathways

Abstract

An unusually slow electron transfer takes place in the porphyrinato complex 1 (M = Ni, Zn). The rate of this proton-coupled electron transfer is influenced by a salt bridge in which benzoate ions are bound to the amidinium group, even in solvents with a high dielectric constant, such as DMSO.