78938 20231006143253.0 doi 10.1039/c8cy02306a sideral 111288 ART-2019-111288 eng Puerta-Oteo, R. (orcid)0000-0002-5465-4873 Molecular water oxidation catalysis by zwitterionic carboxylate bridge-functionalized bis-NHC iridium complexes 2019 Access copy available to the general public Unrestricted Zwitterionic water-soluble [Cp*Ir III Cl{(MeIm) 2 CHCOO}] and [Ir I (cod){(MeIm) 2 CHCOO}] complexes featuring a carboxylate bridge-functionalized bis-N-heterocyclic carbene ligand efficiently catalyzed water oxidation using ammonium cerium(iv) nitrate (CAN) or sodium periodate as sacrificial oxidants. Excellent yields with TOF 50 numbers up to 1000 h -1 have been achieved using CAN as electron acceptor at [CAN]/[Ir] ratios higher than 700. The investigation of the reaction mechanism by UV-vis seems to evidence that both catalyst precursors are transformed into the same active molecular species resulting from the degradation of the hydrocarbon ligands which is partially supported by the similarity of the oxygen evolution profiles at moderate oxidant/catalyst ratios for both catalyst precursors and the same chemical oxidant. In addition, DLS studies provide evidence for the participation of homogeneous iridium molecular species as intermediates likely stabilized by the carboxylate-functionalized bis-NHC ligand. info:eu-repo/grantAgreement/ES/DGA-FSE/E42-17R info:eu-repo/grantAgreement/ES/MINECO/BES-2011-045364 info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2013-42532-P info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2016-75884-P info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 5.721 2019 CHEMISTRY, PHYSICAL 41 / 159 = 0.258 2019 Q2 T1 1.579 2019 Catalysis 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Jiménez, M.V. Universidad de Zaragoza (orcid)0000-0002-0545-9107 Pérez-Torrente, J.J. Universidad de Zaragoza (orcid)0000-0002-3327-0918 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 9, 6 (2019), 1437-1450 CATALYSIS SCIENCE & TECHNOLOGY Catalysis Science and Technology 2044-4753 958525 http://zaguan.unizar.es/record/78938/files/texto_completo.pdf Versión publicada 14379 http://zaguan.unizar.es/record/78938/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:78938 articulos driver 2023-10-06-14:06:11 ARTICLE