Figure 4.

Controlled potential electrolysis experiments of (a) FeDiPP, (b) FeTriPP, and (c) FeTetraPP. Conditions: 1.0 mM (dark traces) or 0.25 mM (light traces) catalyst concentration, 100 mM PhOH, 0.1 M TBAPF₆ in CO₂-saturated DMF, 90 min at ∼−2.2 V vs Fc/Fc⁺. Performed in duplicate; average currents are reported, and shaded regions represent the standard error when larger than the data trace itself. Dark dashed lines represent average current density at 1.0 mM porphyrin and light dashed lines show one fourth of this current density.