Proton-coupled electron transfer (PCET) plays a central role in photosynthesis and potentially in solar-to-fuel systems. We report a spectroscopy study on a phenol-pyrrolidinofullerene. Quenching of the singlet excited state from 1 ns to 250 ps is assigned to PCET. A H/D exchange study reveals a kinetic isotope effect (KIE) of 3.0, consistent with a concerted PCET mechanism.
Ravensbergen, J., Brown, C. L., Moore, G. F., Frese, R. N., van Grondelle, R., Gust, D., ... Kennis, J. T. M. (2015). Kinetic isotope effect of proton-coupled electron transfer in a hydrogen bonded phenol-pyrrolidinofullerene. Photochemical and Photobiological Sciences, 14(12), 2147-2150. https://doi.org/10.1039/c5pp00259a