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(a) Femtosecond transient absorption spectra of 1 on NiO after excitation at 550 nm, the inset kinetic trace is probed at 458 nm. (b) Femtosecond transient absorption spectra of 2 on NiO after excitation at 550 nm, the inset kinetic trace is probed at 463 nm. (c) Femtosecond transient absorption spectra of 3 on NiO after excitation at 550 nm, the inset kinetic trace is probed at 461 nm. Arrows highlight the weak transient at 660 nm, which corresponds to the porphyrin radical anion.
