Figure 2.

(a) Structures of iron(III) meso-phenylporphyrin catalysts studied in this work. (b) Dynamic light scattering (DLS) analysis of FeTetraPP aggregates at variable concentrations. Conditions: 0.5–0.3 mM porphyrin as indicated, 0.1 M TBAPF₆ in DMF. (c) UV–vis absorption spectra as a function of the catalyst concentration. Concentration-normalized spectra (absorbance divided by catalyst concentration) of the Q-band region at 2.0–0.125 mM of FeDiPP (left), FeTriPP (middle), and FeTetraPP (right). Arrows depict the spectral changes upon dilution. Conditions: indicated catalyst concentration, 0.1 M TBAPF₆ in DMF, 1 mm path length.