Flash photolysis of aqueous solutions of protoporphyrin IX at pH values below 2 results in strong triplet state absorptions while at any higher pH, including physiologically relevant values, no triplet state formation can be detected.
J. Lafferty and T. G. Truscott, J. Chem. Soc., Chem. Commun., 1978, 51 DOI: 10.1039/C39780000051
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