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Proton Pump for O 2 Reduction Catalyzed by 5,10,15,20‐Tetraphenylporphyrinatocobalt(II)
Author(s) -
PartoviNia Raheleh,
Su Bin,
Li Fei,
Gros Claude P.,
Barbe JeanMichel,
Samec Zdenek,
Girault Hubert H.
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200801807
Subject(s) - ferrocene , catalysis , chemistry , proton , electron transfer , hydrogen peroxide , dichloroethane , phase (matter) , 1,2 dichloroethane , electrochemistry , organic chemistry , physics , electrode , quantum mechanics
Oxygen reduction : A polarized water|1,2‐dichloroethane (DCE) interface acts as a proton pump for the [Co(tpp)] (TPP=5,10,15,20‐tetraphenylporphyrinato) catalyzed O 2 reduction by ferrocene (Fc) compounds to produce H 2 O 2 (see figure; IT=ion transfer, ET=electron transfer). This system favours the collection of H 2 O 2 by extraction immediately after its formation in DCE to the adjacent water phase.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.