Mono- and binuclear ruthenium corroles: synthesis,spectroscopy, electrochemistry,and structural characterization |
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Authors: | Simkhovich Liliya Luobeznova Inna Goldberg Israel Gross Zeev |
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Institution: | Department of Chemistry and Institute of Catalysis Science and Technology, Technion-Israel Institute of Technology, Haifa 32 000, Israel. |
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Abstract: | The aim of this research was to prepare mononuclear ruthenium corroles, because of the well-documented potency of analogous porphyrin complexes in catalysis. The syntheses of the mononuclear nitrosyl complexes Ru(tpfc)(NO)] and Ru(tdcc)(NO)] (tpfc=trianion of 5,10,15-tris(pentafluorophenyl)corrole, tdcc=trianion of 5,10,15-tris(2,6-dichlorophenyl)corrole), and of the binuclear Ru(tpfc)](2)] were achieved by using Ru(cod)Cl(2)](x)] (cod=cyclooctadiene) as the metal source. The NMR spectra of all three complexes clearly demonstrate that they are diamagnetic; this is consistent with a triple bond between the metal ions in Ru(tpfc)](2)] and is expected for classical MNO](6) complexes. These features were further substantiated by the stretching frequencies of the MNO] moieties, electrochemical measurements on all complexes, and the X-ray crystal structures of Ru(tpfc)(NO)] and Ru(tpfc)](2)]. A comparison of the spectroscopic and structural characteristics of these new complexes with analogous iron corroles, as well as with iron and ruthenium porphyrins, suggests that it will be hard to obtain mononuclear ruthenium corroles without pi-accepting ligands. |
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Keywords: | cyclic voltammetry iron NMR spectroscopy porphyrinoids ruthenium X‐ray diffraction |
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