By contrast, TPhP-α in ascorbic acid solution showed no significant quenching of the excited state lifetime (SI, Figure ). Similarly, neither TPhP-α nor TPyP-α showed a significant reduction in excited state lifetime in the presence of TEA (SI, Figure ). This indicates that poor interaction with the ascorbic acid or TEA hole scavenger might limit the activity of TPhPα and TPyP-α for proton reduction in comparison to TBAP-α.