Fig. 6. UV–vis spectra investigating the reduction of FeTDHPP.

Systems containing 30 mM BIH, 20 μM FeTDHPP, 20 μM 5, and 2 mL DMF in a quartz cuvette (10-mm path length) under N₂ at 20 °C, upon irradiation with (a) white LED light (λ > 400 nm, 100 mW/cm²), or with (b) a 300 W xenon light source equipped with a 550 nm cut-off filter (λ > 550 nm) for 8 h. Source data are provided as a Source Data file.