Počet záznamů: 1

Oxygen Reduction Catalyzed by a Fluorinated Tetraphenylporphyrin Free Base at Liquid/Liquid Interfaces

  1. 1.
    0348915 - UFCH-W 2011 RIV US eng J - Článek v odborném periodiku
    Hatay, I. - Su, B. - Méndez, M. A. - Corminboeuf, C. - Khoury, T. - Gros, C. P. - Bourdillon, M. - Meyer, M. - Barbe, J.-M. - Ersöz, M. - Záliš, Stanislav - Samec, Zdeněk - Girault, H. H.
    Oxygen Reduction Catalyzed by a Fluorinated Tetraphenylporphyrin Free Base at Liquid/Liquid Interfaces.
    Journal of the American Chemical Society. Roč. 132, č. 39 (2010), s. 13733-13741 ISSN 0002-7863
    Grant CEP: GA ČR(CZ) GA203/07/1257; GA MŠk OC 177
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: tetraphenylporphyrin * electrocatalysis * liquid/liquid interfaces
    Kód oboru RIV: CG - Elektrochemie
    Impakt faktor: 9.019, rok: 2010

    The diprotonated form of a fluorinated free base porphyrin, namely 5-(p-aminophenyl)-10,15,20-tris(pentafluorophenyl)porphyrin (H(2)FAP), can catalyze the reduction of oxygen by a weak electron donor, namely ferrocene (Fc). At a water/1,2-dichloroethane interface, the interfacial formation of H(4)FAP(2+) is observed by UV-vis spectroscopy and ion-transfer voltammetry, due to the double protonation of H(2)FAP at the imino nitrogen atoms in the tetrapyrrole ring. H(4)FAP(2+) is shown to bind oxygen, and the complex in the organic phase can easily be reduced by Fc to produce hydrogen peroxide as studied by two-phase reactions with the Galvani potential difference between the two phases being controlled by the partition of a common ion. Spectrophotometric measurements performed in 1,2-dichloroethane solutions clearly evidence that reduction of oxygen by Fc catalyzed by H(4)FAP(2+) only occurs in the presence of the tetrakis(pentafluorophenyl)borate (TB-) counteranion in the organic phase.
    Trvalý link: http://hdl.handle.net/11104/0189303