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Hydrogen bonding interactions between biological chromophores and theirsurrounding protein and solvent environment significantly affect thephotochemical pathways of the chromophore and its biological function. A commonfirst step in the dynamics of these systems is excited state proton transferbetween the non-covalently bound molecules, which stabilises the system againstdissociation and principally alters relaxation pathways. Despite suchfundamental importance, studying excited state proton transfer across ahydrogen bond has proven difficult, leaving uncertainties about the mechanism.Through time-resolved photoelectron imaging measurements we demonstrate how theaddition of a single hydrogen bond and the opening of an excited state protontransfer channel dramatically changes the outcome of a photochemical reaction,from rapid dissociation in the isolated chromophore, to efficient stabilisationand ground state recovery in the hydrogen bonded case, and uncover themechanism of excited state proton transfer at a hydrogen bond, which followssequential hydrogen and charge transfer processes.

Hydrogen Bonds in Excited State Proton Transfer