Synthesis, characterization and electrochemical behavior of oxo-bridged (arylimido)[tris(3,5-dimethylpyrazolyl)borato] molybdenum(V) complexes |
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Authors: | Isil Topaloglu-Sozuer Alev Gunyar Miguel Baya |
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Institution: | a Department of Chemistry, Faculty of Science, Izmir Institute of Technology, Gulbahce, Urla-35430, Izmir, Turkey b Laboratoire de Chimie de Coordination, UPR CNRS 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France |
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Abstract: | Reaction of the oxo-molybdenum(V) precursor MoTp*(O)Cl2] Tp* = hydrotris(3,5-dimethyl-1-pyrazolyl)borate] with H2NC6H4R-4 (R = OEt; OPr) in refluxing toluene in the presence of Et3N afforded the binuclear oxo-bridged oxo(arylimido) molybdenum(V) complexes Tp*Mo(O)Cl](μ-O)Tp*Mo(NC6H4OR-4)Cl]. Surprisingly, a similar reaction between MoTp*(O)Cl2] and C6H5NH2 yielded the previously reported compound {MoTp*(O)Cl}2(μ-O)] as the only product. The new compounds were characterized by microanalytical data, mass spectrometry, IR and 1H NMR spectroscopy. Cyclic voltammetric studies of the new compounds, of the previously reported compounds Tp*Mo(O)Cl](μ-O)Tp*Mo(NAr)Cl] (Ar = C6H4OMe-4, C6H4F-3, C6H4Cl-4, C6H4Br-4, and C6H4I-3), and of {MoTp*(O)Cl}2(μ-O)] revealed a reversible one-electron oxidation process that is little affected by the nature of the substituent on the aryl group, whereas it is greatly affected by replacement of the imido ligand with an oxo ligand. The {MoTp*(O)Cl}2(μ-O)] compound also shows a one-electron reduction process. |
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Keywords: | Imido complexes Molybdenum complexes Oxo-bridged Mo(V) complexes Oxo complexes (Pyrazol)borato complexes Electrochemistry |
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