Reference of 5,10,15,20-Tetrakis (4-methoxyphenyl)-21H,23H-porphine cobalt (II). The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 5,10,15,20-Tetrakis (4-methoxyphenyl)-21H,23H-porphine cobalt (II), is researched, Molecular C48H38CoN4O4, CAS is 28903-71-1, about Axial ligands tailoring the ORR activity of cobalt porphyrin. Author is Zhou, Yue; Xing, Yong-Fang; Wen, Jing; Ma, Hai-Bo; Wang, Feng-Bin; Xia, Xing-Hua.
In an effort to provide visualization and understanding to the electronic “”push effect”” of axial ligands on the catalytic activity of cobalt macrocyclic mols., we design a simple model system involving an [5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin]cobalt(II) (TMMPCo) monolayer axially-coordinated on thiol ligand modified Au electrode and explore the activity of the axial-ligand coordinated TMPPCo toward oxygen reduction reaction (ORR) in acidic medium. Three different ligands, with a decreasing order of coordinating ability as: 4-mercaptopyridine (MPy) > 4-aminothiolphenol (APT) > 4-mercaptobenzonitrile (MBN) are used and a maximum difference in ORR onset potential of 80 mV is observed between the MPy (highest onset potential) and MBN systems (lowest onset potential). The ORR activity of TMPPCo increases with the increase in binding strength of the axial ligand. A detailed mechanism study reveals that ORR on the three ligand coordinated TMPPCo systems shares the same 2-electron mechanism with H2O2 as the terminal product. Theor. calculation into the structure of the ligand coordinated cobalt porphyrins uncovers the variation in at. charge of the Co(II) center and altered frontier MO distribution among the three ligand systems. Both properties have great influence on the back-bonding formation between the Co(II) center and O2 mols., which has been suggested to be critical toward the O2 adsorption and subsequent activation process.
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Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com