Mechanistic aspects of the electroreduction of dioxygen as catalyzed by copper-phenanthroline complexes adsorbed on graphite electrodes

1,10-phenanthroline metal complex covalently bonding to poly- (pyrrole-3-carboxylic acid)-coated carbon: An efficient electrocatalyst for oxygen reduction

“…A series of copper(II) complexes with 1,10-phenanthroline (phen), 5-chloro-1,10-phenanthroline and 2,9-dimethyl-1,10-phenanthroline (DMP), which may form a mixture of the [CuL] 2+ and [CuL2] 2+ complexes, adsorbed onto edge plane graphite electrodes were prepared by Anson and coworkers [11][12][13]. Although the obtained electrode showed considerable catalytic abilities for ORR, the less reproducible adsorption behavior and the instability of the modified electrode make the physical adsorption process has some limitations in practical applications [12].…”

Electrocatalysis of Oxygen Reduction by Cu-containing Polymer Films on Glassy Carbon Electrodes

“…For example, Cu(II)-complexes bearing one phenanthroline ligand show more negative reduction potentials than those bearing two ligands. 28 In this study, we observe two redox waves from pBpCuOx films coated on GCE. There could be several explanations for the origin of the redox waves observed here.…”

“…[27][28][29][30] In these reports, Cu(II)-complexes coated on graphite surfaces exhibit redox waves corresponding to a Cu(II)/ Cu(I) redox couple. Depending on the number of phenanthroline ligands, the Cu(II)/Cu(I) redox couple in the complex exhibits different reduction peak potentials.…”

“…[27][28][29]31,32 For example, the half wave potential of O 2 reduction at Cu(II)-bipyridine adsorbed EPG surfaces is −0.2 V at pH 5. 27 The reduction potential for O 2 reduction on pBpCuOx-coated GCE in 0.1 M acetate buffer (pH 4.7) is close to this value as shown in Figure 2.…”

Mechanisms of Nitric Oxide Reactions Mediated by Biologically Relevant Metal Centers

“…The Cu(II) complex Cu(dmp) 2 (H 2 O) 2+ (dmp ¼ 2,9-dimethyl-1,10-phenanthroline) is a stronger oxidant than most Cu(II) complexes (reduction potential ¼ 0.58 V vs. NHE) [133]. Since the Cu(phen) 2 (H 2 O) 2+ analog (phen ¼ 1,10-phenanthroline) is a much weaker oxidant (0.18 V), this property can be attributed to the steric Scheme 6 Proposed mechanism for the nitrite catalysis of the reductive nitrosylation of Fe III (TPPS), metHb, and metMb [127] 122 P.C.…”