title: A molecular ruthenium catalyst with water-oxidation activity comparable to that of photosystem II.
abstract: Across chemical disciplines, an interest in developing artificial water splitting to O(2) and H(2), driven by sunlight, has been motivated by the need for practical and environmentally friendly power generation without the consumption of fossil fuels. The central issue in light-driven water splitting is the efficiency of the water oxidation, which in the best-known catalysts falls short of the desired level by approximately two orders of magnitude. Here, we show that it is possible to close that 'two orders of magnitude' gap with a rationally designed molecular catalyst [Ru(bda)(isoq)(2)] (H(2)bda = 2,2'-bipyridine-6,6'-dicarboxylic acid; isoq = isoquinoline). This speeds up the water oxidation to an unprecedentedly high reaction rate with a turnover frequency of >300 s(-1). This value is, for the first time, moderately comparable with the reaction rate of 100-400 s(-1) of the oxygen-evolving complex of photosystem II in vivo.
authors.affiliation: Department of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
authors.forename: Lele
authors.initials: L
authors.lastname: Duan
authors.forename: Fernando
authors.initials: F
authors.lastname: Bozoglian
authors.forename: Sukanta
authors.initials: S
authors.lastname: Mandal
authors.forename: Beverly
authors.initials: B
authors.lastname: Stewart
authors.forename: Timofei
authors.initials: T
authors.lastname: Privalov
authors.forename: Antoni
authors.initials: A
authors.lastname: Llobet
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
mesh_terms: D002384:Catalysis; D004736:Energy-Generating Resources; D006859:Hydrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D045332:Photosystem II Protein Complex / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D045332:Photosystem II Protein Complex; D014867:Water; D012428:Ruthenium; D006859:Hydrogen; D010100:Oxygen