Table 1.

Electrochemical data for free-base porphyrins and their Mn complexes in aqueous solutions^a

Porphyrins	E½, mV vs NHE	Ref.
H2TM-3-PyP4+	−212b (268)c	this work
MnIIITM-3-PyP5+	+52	[26]
HBr8TM-3-PyP3+	+122b (233)c	this work
MnII Br8TM-3-PyP4+	+468 (93)c	this work
MnIIITM-4-PyP5+	+60d	[26]
MnII Br8TM-4-PyP4+	+480	[12]
Cu,Zn-SOD	ca. +300	[35–37]

^aConditions: 0.5 mM porphyrin, 0.05 M phosphate buffer, pH 7.8, 0.1 M NaCl, scan rate 0.1 V s⁻¹.

^bIrreversible wave.

^cCathodic/anodic peak-to-peak separation.