Electrochemical and electrocatalytic properties of tetra(pyridyl-4′,3′)porphin series derivatives

Electrocatalytic Reduction of Oxygen on Graphitized Carbon Electrode Modified with 5,15-Bis(pyrid-4-yl)-3,7,13,17-tetramethyl- 2,8,12,18-tetraethylporphine and Its Cu(II) and Fe(III) Complexes

“…The reduction process of macrocycle III с is irreversible. Because of proximity of the observed cathode processes I с и II с in potentials, this part of the voltammogram could be expanded to Gaussian components, [22] or subtraction of background current for electrodes before and after introducing porphyrins into the active mass could be build. In this case the second method is more reliable.…”

“…The study has shown [21,22] that the meso-pyridyl substitution of porphine (T(3-Py)P and T(4-Py)P) give a positive effect on its electrocatalytic activity in the reaction of molecular oxygen electroreduction, compared to their phenyl analogs in TPhP. Thus, the effect of depolarization of electroreduction process of molecular oxygen are 50 and 80 mV (vs. Ag/AgCl electrode) for electrodes Co II T(3-Py)P and Co II T(4-Py)P compared with Co II TPhP in aqueous alkaline medium.…”

“…Pyridyl substituted porphyrins and their complexes with d-metals form a group of perspective catalysts in ORR due to the features of their chemical structure. Previously it was shown [21][22][23] that the introduction of pyridyl substituents into the porphyrin molecule has a positive effect on the electrocatalytic properties of these compounds in ORR in aqueous alkaline medium.…”

“…The electrochemical behavior of T(3-Py)P and T(4-Py)P [21,22] and mono(3-Py)TMeTEtP [23] in aqueous alkaline medium has been characterized in the course of electroreduction (electrooxidation) processes not only on the metal ion (Co, Cu , Fe) or the π-conjugated system of the macrocycle, but also on the electron-withdrawing (pyridyl) substituents, which are reduced in the potential range -0.7÷ -0.8 V (vs. Ag/AgCl electrode). The redox-behavior of electroactive pyridyl substituents are also discussed in [24] .…”

Electrochemical behavior of a number of bispyridyl-substituted porphyrins and their electrocatalytic activity in molecular oxygen reduction reaction

“…It was shown that metalloporphyrins and metallophthalocyanines generally exhibit a good activity in ORR [3][4][5][6][7]. The ORR on the graphitized carbon electrodes with active layers containing technical elemental carbon (TEC) and porphyrins in KOH aqueous solution has been studied in works [8][9][10]. It was found that the introduction of a pyridyl substituent in the alkyl-substituted porphyrins leads to an increase in the rate of ORR [8].…”