Spontaneous (AGO -30 kJ mol-I) ion pairing occurs between zinc meso-tetrakis(4-sulfonatophenyl)porphyrin (ZnTSPp) and polycyclic quaternary salts in water. Upon excitation with visible light, these nonfluorescent ion pairs undergo rapid
A model system for mimicry of the protochlorophyllide reductase enzymatic process, consisting of a zinc porphyrin covalently linked to a dihydroflavin, undergoes two successive one-electron transfer steps upon illumination, forming a zinc porphodimethene and the corresponding flavin.
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