Table 3. The reduction potential E_1/2 vs NHE, k_cat(H₂O₂) for the catalysis of H₂O₂ dismutation and log k_cat(O₂^.−) for the catalysis of O₂^.− dismutation of various redox-active compounds and catalase.

If not indicated, the data are taken from [19, 21, 22, 49, 50]. The catalysis of H₂O₂ dismutation was followed in 0.05 M tris buffer at (25±1) °C with Clark oxygen electrode. In case of Fe(III) porphyrins, Mn(III) salen and Mn(II) cyclic polyamines the E_1/2 relates to the M^III/M^II redox couple, while it relates to M^IV/M^III redox couple in case of Fe(III) corrole. The catalysis of O₂^.− dismutation was followed in 0.05 M potassium phosphate buffer, pH 7.8 at (25±1) °C as described in references [49, 50, 83]. The k_cat(H₂O₂) value for Fe corrole was determined at 37 °C [53], while k_cat(O₂^.−) was measured at (25±1) °C [52].

Compound	E_1/2, mV vs NHE	k_cat (H₂O₂), M⁻¹ s⁻¹	log k_cat (O₂^.−)
FeTE-2-PyP⁵⁺, ^a	+211	803.5	8.05
FeTnOct-2-PyP⁵⁺, ^a	+261	368.4	7.09
FeTrF₅Ph-β(SO₃)₂-corrole²⁻	+1050^b	6400^c	6.48^d
MnCl₂	+850^e	none	6.11–6.95
Mn Salen, EUK-8	+130	13.5	6.36^f
M40403	+525(ACN)	8.2	7.08
M40404	+452(ACN)	6.5	none
Nitroxide, Tempol	+810^g	none	< 3 at pH 7.8
Nitrone, NXY-059		none
Ebselen		none
Catalase enzyme		1.5 × 10⁶

At physiological pH the FeTE(or nOct)-2-PyP⁵⁺ has one hydroxo ligand bound axially and thus carries 4+ total charge;

refs [19, 21];

the k_cat(H₂O₂) was determined at 37°C [53];

ref [52];

oxidation potential only;

corrected value;

one-electron reduction potential relates to RNO⁺/RNO redox couple.

Table 3. The reduction potential E1/2 vs NHE, kcat(H2O2) for the catalysis of H2O2 dismutation and log kcat(O2.−) for the catalysis of O2.− dismutation of various redox-active compounds and catalase.

Table 3. The reduction potential E_1/2 vs NHE, k_cat(H₂O₂) for the catalysis of H₂O₂ dismutation and log k_cat(O₂^.−) for the catalysis of O₂^.− dismutation of various redox-active compounds and catalase.