A new Ru complex capable of catalytically oxidizing water to molecular dioxygen

Cristina Sens, Isabel Romero, Montserrat Rodríguez, Antoni Llobet, Teodor Parella, Jordi Benet-Buchholz

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    324 Citations (Scopus)

    Abstract

    We have prepared three new dinuclear ruthenium complexes having the formulas [Ru2II(bpp)(trpy)2(μ-L)]2+ (L = Cl, 1; L = AcO, 2) and [Ru2II(bpp)(trpy)2(H2O)2]3+ (3). The three complexes have been characterized through the usual spectroscopic and electrochemical techniques and, in the cases of 1 and 2, the X-ray crystal structures have been solved. In aqueous acidic solution, the acetato bridge of 2 is replaced by aqua ligands, generating the bis(aqua) complex 3 which, upon oxidation to its RuIVRuIV state, has been shown to catalytically oxidize water to molecular oxygen. The measured pseudo-first-order rate constant for the O2-evolvingprocess is 1.4 × 10-2 s-1, more than 3 times larger than the higher one previously reported for Ru-O-Ru type catalysts. This new water-splitting catalyst also has improved stability with regard to any previously described, achieving a total of 18.6 metal cycles. Copyright © 2004 American Chemical Society.
    Original languageEnglish
    Pages (from-to)7798-7799
    JournalJournal of the American Chemical Society
    Volume126
    DOIs
    Publication statusPublished - 30 Jun 2004

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