Complexes [Cp*Ir(ppy)NO3] (ppy 1⁄4 2-phenylpyridine, 1), [Cp*Ir(20 ,40 -F2-ppy)NO3] (2b), [Cp*Ir(k2-C2,C20 - NHC)Cl], (k2-C2,C20 -NHC 1⁄4 k2-C2,C20 -1,3-bis(4-(N,N-dimethylamino)phenyl)-imidazol-2-ylidene, 3), [Cp*Ir(bpyr)(SOMe2)] (bpyr 1⁄4 bis-diethyl-pyrrole, 4), [Cp*Ir(bimH2)Cl]Cl (bimH2 1⁄4 2,20-bisimidazole, 5) and [Cp*IrCl(m2-k2-k1-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 1e6 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 1⁄4 12 min"1, TON > 500), 5 (TOFmax 1⁄4 23 min"1, TON > 500) and 6 (TOFmax 1⁄4 51 min"1, TON > 500) bearing more electron-donating ligands.
New iridium(III) organometallic complexes bearing strong electron donating bidentate ligands as catalysts for water oxidation
SAVINI, ARIANNA;BUCCI, ALBERTO;BELLACHIOMA, Gianfranco;ROCCHIGIANI, LUCA;ROSSI, ANDREA;ZUCCACCIA, Cristiano;MACCHIONI, Alceo
2014
Abstract
Complexes [Cp*Ir(ppy)NO3] (ppy 1⁄4 2-phenylpyridine, 1), [Cp*Ir(20 ,40 -F2-ppy)NO3] (2b), [Cp*Ir(k2-C2,C20 - NHC)Cl], (k2-C2,C20 -NHC 1⁄4 k2-C2,C20 -1,3-bis(4-(N,N-dimethylamino)phenyl)-imidazol-2-ylidene, 3), [Cp*Ir(bpyr)(SOMe2)] (bpyr 1⁄4 bis-diethyl-pyrrole, 4), [Cp*Ir(bimH2)Cl]Cl (bimH2 1⁄4 2,20-bisimidazole, 5) and [Cp*IrCl(m2-k2-k1-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 1e6 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 1⁄4 12 min"1, TON > 500), 5 (TOFmax 1⁄4 23 min"1, TON > 500) and 6 (TOFmax 1⁄4 51 min"1, TON > 500) bearing more electron-donating ligands.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
