Extremely efficient fluorescence quenching occurs when the porphyrin chromophores of the title compounds are effectively parallel; intramolecular metal co-ordination forces the quinone to be perpendicular, and reduces the fluorescence quenching.
P. Leighton and J. K. M. Sanders, J. Chem. Soc., Chem. Commun., 1985, 24 DOI: 10.1039/C39850000024
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