Chris’s paper, titled ‘Influence of Proton Acceptors on the Proton-Coupled Electron Transfer Reaction Kinetics of a Ruthenium-Tyrosine Complex’ was accepted to The Journal of Physical Chemistry B. In this paper, we report a polypyridyl ruthenium complex with fluorinated bipyridine ligands and a covalently bound tyrosine moiety and discuss its photo-induced proton-coupled electron transfer (PCET) reactivity in acetonitrile. PCET reactivity was found to proceed through an equilibrium ET-PT pathway in which irreversible deprotonation of the tyrosine radical cation shifts the ET equilibrium, conferring a base dependence on the reaction. Across the five pyridine bases explored, spanning a range of 4.2 pKa units, a linear free energy relationship was found for the proton transfer rate constant with a slope of 0.32. These findings highlight the influence that proton transfer driving force exerts on PCET reaction kinetics.