Novel Trinuclear Ruthenium Complex For Light Driven Water Oxidation

MAURICIO CATTANEO; MARCUS STEINERT; SEBASTIAN DECHERT; FRANC MEYER

Göttingen

Simposio; NiKaS 2014 - Niedersächsisches Katalyse Symposium; 2014

Georg-August-Universität Göttingen

Novel Trinuclear Ruthenium Complexes For Light Driven Water Oxidation Mauricio Cattaneo1,2, Franc Meyer1 1 Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4 37077 Göttingen, Germany 2 INQUINOA-CONICET, Instituto de Química Fisica, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina cattaneomauricio@gmail.com Studies on catalytic water oxidation with mono- and dinuclear ruthenium complexes have captured much attention in last years.1 Recent advances in the group with a new pyrazolate-based ligand ({[Ru(py)2(OH2)]2(-Mebbp)}3+) showed to improve catalyst performance.2 As the main source of oxidative power in those experiments comes from cerium (IV)that has to be added as sacrificial oxidant to generate oxygen evolution, new sources of oxidative power are needed and light power is the most desirable one. With the aim of generating an intramolecular electron transfer from the dinuclear ruthenium water oxidation catalyst to some light driven electron acceptor we synthesized a new trinuclear complex were the dinuclear catalytic moeity for water oxidation is coupled to a [Ru(bpy)3] 2+ antenna via a multistep ligand synthesis. The trinuclear complexes wre synthetized as PF6- salts and it were fully characterized by spectroscopic, analytical and electrochemical techniques. Spectroscopy and electrochemistry resembles the parent compound {[Ru(py)2(OH2)]2(-Mebbp)}3+ with the extra part of the third ruthenium center. Water oxidation catalysis shows a TOF = 0.053 s-1 . Further photophysical studies are under way. References 1. a) S. Romain, L. Vigara, A. Llobet, Acc. Chem. Res. 2009, 42, 1944. b) C. J. Gagliardi, A. K. Vannucci, J. J. Concepcion, Z. Chen, T. J. Meyer, Energy Environ. Sci. 2008, 5, 7704. 2. S. Neudeck, S. Maji, I. Lopez, S. Meyer, F. Meyer, A. Llobet, J. Am. Chem. Soc. 2014, 136, 24.