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Peljo, Pekka; Murtomäki, Lasse; Kallio, Tanja; Xu, Hai-Jun; Meyer, Michel; Gros, Claude P.; Barbe, Jean-Michel; Girault, Hubert H.; Laasonen, Kari; Kontturi, Kyösti
Journal of the American Chemical Society, 04/2012, Volume: 134, Issue: 13Journal Article
Oxygen reduction catalyzed by cofacial metalloporphyrins at the 1,2-dichlorobenzene–water interface was studied with two lipophilic electron donors of similar driving force, 1,1′-dimethylferrocene (DMFc) and tetrathiafulvalene (TTF). The reaction produces mainly water and some hydrogen peroxide, but the mediator has a significant effect on the selectivity, as DMFc and the porphyrins themselves catalyze the decomposition and the further reduction of hydrogen peroxide. Density functional theory calculations indicate that the biscobaltporphyrin, 4,5-bis5-(2,8,13,17-tetraethyl-3,7,12,18-tetramethylporphyrinyl)-9,9-dimethylxanthene, Co2(DPX), actually catalyzes oxygen reduction to hydrogen peroxide when oxygen is bound on the “exo” side (“dock-on”) of the catalyst, while four-electron reduction takes place with oxygen bound on the “endo” side (“dock-in”) of the molecule. These results can be explained by a “dock-on/dock-in” mechanism. The next step for improving bioinspired oxygen reduction catalysts would be blocking the “dock-on” path to achieve selective four-electron reduction of molecular oxygen.
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