“…UV–vis absorption spectroscopy (Figure e) confirmed that one of the exo‐pyrrole double bonds of ZnTPP is reduced (Figure a), resulting in the appearance of three new absorption bands, at 510, 602, and 626 nm, assigned to the Q x (0,1), Q y (0,1), and Q y (0,0) transitions of zinc (II) meso‐tetraphenylchlorin (ZnTPC) (Figure b). The strong decrease of the band intensity located at 555 nm corresponds to the Q y (0,0) transition of ZnTPP . No evidence of further reduction of the other available exo‐pyrrole double bonds of the porphyrinoid ring could be detected.…”