Proton Pump for O-2 Reduction Catalyzed by 5,10,15,20-Tetraphenylporphyrinatocobalt(II)

0358958 - ÚFCH JH 2011 RIV DE eng J - Journal Article
Partovi-Nia, R. - Su, B. - Li, F. - Gros, C. P. - Barbe, J.-M. - Samec, Zdeněk - Girault, H. H.
Proton Pump for O-2 Reduction Catalyzed by 5,10,15,20-Tetraphenylporphyrinatocobalt(II).
[Protonová pumpa v redukci kyslíku katalyzované 5,10,15,20-tetrafenylpofyrinem Co(II).]
Chemistry - A European Journal. Roč. 15, č. 10 (2009), s. 2335-2340. ISSN 0947-6539. E-ISSN 1521-3765
R&D Projects: GA MŠMT OC 177
Keywords : cobalt * ferrocenes * hydrogen peroxide * oxygen reduction * proton pump
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 5.382, year: 2009

The role of 5,10,15,20-tetra-phenylporphyrinatocobalt(II) ([Co-(tpp)]) as a catalyst on molecular oxygen (O-2) reduction by ferrocene (Fc) and its two derivatives, methylferrocene (DFc) and decamethylferroccric (DMFc) at a polarized waterl 1,2-dichloroethane (DCE) interface has been studied. The water vertical bar DCE interface essentially acts as a proton pump controlled by the Galvani poten tial 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 (H2O2). The catalytic mechanism is similar to that proposed by Fukuzumi et al. for bulk reactions. This interfacial system provides it platform for a very efficient collection of 11,0, 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.

Byla studována role 5,10,15,20-tetrafenylpofyrinu Co(II) (Co(tpp)) jako katalyzátoru redukce molekulárního kyslíku ferrocenem, a jeho deriváty 1,1´- dimetylferrocenem resp. dekametylferrocenem, na polarizovaném rozhraní voda/1,2-dichloretan (DCE). Toto rozhraní funguje jako protonová pumpa řízená mezifázovým potenciálovým rozdílem pohánějící přenos protonu do DCE, kde se proton účastní redukce kyslíku katalyzované Co(tpp) za vzniku peroxidu vodíku. Peroxid vodíku je následně spontáně extrahován do vodné fáze.
Permanent Link: http://hdl.handle.net/11104/0196851