Cationic Mn(III), Co(III) and Ni(II) porphyrins show characteristic fluorescence.
Their long-lived triplet excited states play key roles in photocatalytic systems.
Anionic Ln(III) mono- and bisporphyrins exhibit similar photoinduced properties.
Their photolysis at the Soret-band produces a radical type intermediate.
However, during their irradiation at the Q-bands, a stable photoproduct appears.