New iridium(III) organometallic complexes bearing strong electron donating bidentate ligands as catalysts for water oxidation

Arianna Savini, Alberto Bucci, Gianfranco Bellachioma, Stefano Giancola, Francesco Palomba, Luca Rocchigiani, Andrea Rossi, Marta Suriani, Cristiano Zuccaccia, Alceo Macchioni

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Abstract

Complexes [Cp*Ir(ppy)NO3] (ppy = 2-phenylpyridine, 1), [Cp*Ir(2′,4′-F2-ppy)NO3] (2b), [Cp*Ir(κ2-C2,C2′-NHC)Cl], (κ2-C2,C2′-NHC = κ2-C2,C2′-1,3-bis(4-(N,N-dimethylamino)phenyl)-imidazol-2-ylidene, 3), [Cp*Ir(bpyr)(SOMe2)] (bpyr = bis-diethyl-pyrrole, 4), [Cp*Ir(bimH2)Cl]Cl (bimH2 = 2,2′-bisimidazole, 5) and [Cp*IrCl(μ221-bimH)IrCl2Cp*] (6) have been synthesized and characterized in solution by multinuclear and multidimensional NMR spectroscopy. The structures in the solid state of 3 and 6 have been determined by means of single-crystal diffraction X-Ray studies. Complexes 1–6 were found to be effective catalysts for water oxidation to molecular oxygen driven by cerium ammonium nitrate. The highest activity was observed for 4 (TOFmax = 12 min−1, TON > 500), 5 (TOFmax = 23 min−1, TON > 500) and 6 (TOFmax = 51 min−1, TON > 500) bearing more electron-donating ligands.
Original languageEnglish
Pages (from-to)24-32
JournalJournal of Organometallic Chemistry
Volume771
Early online date3 Jul 2014
DOIs
Publication statusPublished - Nov 2014

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