Table 1. Summary of electrochemical properties of iron porphyrin catalysts.

Catalyst	E 0 cat a (V vs. Fc/Fc+)	TOFmax b (s–1)	log(TOFmax)	k cat c (M–2 s–1)	FECO d (%)
Fe–ortho-1-amide	–2.12	2.24 × 104	4.35	1.01 × 106	83 ± 3
Fe–ortho-2-amide	–2.18	5.50 × 106	6.74	3.33 × 108	92 ± 2
Fe–para-1-amide	–2.15	1.70 × 102	2.23	1.03 × 104	74 ± 8
Fe–para-2-amide	–2.16	6.76 × 103	3.84	4.20 × 105	79 ± 8
Fe-TPP	–2.15	6.76 × 102	2.83	2.13 × 105	90 ± 6
Fe-TPP + 50 mM amide	–2.15	4.04 × 103	3.61	3.18 × 105	—

^aThe standard reduction potential for the formal Fe^I/0 couple, E0cat, is reported as an average over three independent experiments.

^bTOF_max values are reported in presence of 100 mM PhOH and 0.23 M CO₂ except for the last entry, which is in presence of 50 mM amide additive and 0.23 M CO₂.

^c k _cat values are reported as an average over three sets of experimental conditions (different [PhOH], 0.23 M CO₂, in the regime where rate is linearly dependent on [PhOH]).

^dFE for CO is reported as an average over three CPE experiments, see ESI for details.