title: Proton pump for O2 reduction catalyzed by 5,10,15,20-tetraphenylporphyrinatocobalt(II).
abstract: The role of 5,10,15,20-tetraphenylporphyrinatocobalt(II) ([Co(tpp)]) as a catalyst on molecular oxygen (O(2)) reduction by ferrocene (Fc) and its two derivatives, 1,1'-dimethylferrocene (DFc) and decamethylferrocene (DMFc) at a polarized water|1,2-dichloroethane (DCE) interface has been studied. The water|DCE interface essentially acts as a proton pump controlled by the Galvani potential difference across the interface, driving the proton transfer from water to DCE. [Co(tpp)] catalyzed O(2) reduction by Fc, DFc and DMFc is then followed to produce hydrogen peroxide (H(2)O(2)). The catalytic mechanism is similar to that proposed by Fukuzumi et al. for bulk reactions. This interfacial system provides a platform for a very efficient collection of H(2)O(2), by extraction immediately after its formation in DCE to the adjacent water phase, thus decreasing the possibility of degradation and further reaction with ferrocene derivatives.
authors.affiliation: Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Raheleh
authors.initials: R
authors.lastname: Partovi-Nia
authors.forename: Bin
authors.initials: B
authors.lastname: Su
authors.forename: Fei
authors.initials: F
authors.lastname: Li
authors.forename: Claude P
authors.initials: CP
authors.lastname: Gros
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Barbe
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Samec
authors.forename: Hubert H
authors.initials: HH
authors.lastname: Girault