title: Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis.
abstract: A new decadentate dinucleating ligand containing a pyridazine bridging group and pyridylic arms has been synthesized and characterized by analytical and spectroscopic techniques. Four new dinuclear cobalt complexes featuring this ligand have been prepared and thoroughly characterized both in the solid state (X-ray diffraction) and in solution (1D and 2D NMR spectroscopy, ESI-MS, and electrochemical techniques). The flexible but stable coordination environment provided by the ligand scaffold when coordinating Co in different oxidation states is shown to play a crucial role in the performance of the set of complexes when tested as catalysts for the photochemical hydrogen evolution reaction (HER) and chemical oxygen reduction reaction (ORR).
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona (Spain).
authors.forename: Carlo
authors.initials: C
authors.lastname: Di Giovanni
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona (Spain).
authors.forename: Carolina
authors.initials: C
authors.lastname: Gimbert-Suriñach
authors.affiliation: Department of Chemistry, University of California, Berkeley, CA 94720 (USA).|Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (USA).|Department of Chemistry, Texas A&M University, College Station, TX 77840 (USA).
authors.forename: Michael
authors.initials: M
authors.lastname: Nippe
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona (Spain).
authors.forename: Jordi
authors.initials: J
authors.lastname: Benet-Buchholz
authors.affiliation: Department of Chemistry, University of California, Berkeley, CA 94720 (USA). jrlong@berkeley.edu.|Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (USA). jrlong@berkeley.edu.
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Long
authors.affiliation: Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona (Spain). xavier.sala@uab.es.
authors.forename: Xavier
authors.initials: X
authors.lastname: Sala
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona (Spain). allobet@iciq.es.|Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona (Spain). allobet@iciq.es.
authors.forename: Antoni
authors.initials: A
authors.lastname: Llobet
keywords: decadentate ligands; dicobalt complexes; oxygen reduction; peroxo bridges; proton reduction