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Formation of a Ruthenium(IV)-Oxo Complex by Electron-Transfer Oxidation of a Coordinatively Saturated Ruthenium(II) Complex and Detection of Oxygen-Rebound Intermediates in C–H Bond Oxygenation

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Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennoudai, Tsukuba, Ibaraki 305-8571
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
ALCA, Japan Science and Technology Agency (JST), 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Graduate School of Life Science, University of Hyogo, Kouto, Hyogo 678-1297, Japan
Department of Bioinspired Science, Ewha Womans University, Seoul, South Korea
[email protected]; [email protected]
Cite this: J. Am. Chem. Soc. 2011, 133, 30, 11692–11700
Publication Date (Web):June 22, 2011
https://doi.org/10.1021/ja2037645
Copyright © 2011 American Chemical Society
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Abstract

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A coordinatively saturated ruthenium(II) complex having tetradentate tris(2-pyridylmethyl)amine (TPA) and bidentate 2,2′-bipyridine (bpy), [Ru(TPA)(bpy)]2+ (1), was oxidized by a Ce(IV) ion in H2O to afford a Ru(IV)-oxo complex, [Ru(O)(H+TPA)(bpy)]3+ (2). The crystal structure of the Ru(IV)-oxo complex 2 was determined by X-ray crystallography. In 2, the TPA ligand partially dissociates to be in a facial tridentate fashion and the uncoordinated pyridine moiety is protonated. The spin state of 2, which showed paramagnetically shifted NMR signals in the range of 60 to −20 ppm, was determined to be an intermediate spin (S = 1) by the Evans’ method with 1H NMR spectroscopy in acetone-d6. The reaction of 2 with various oraganic substrates in acetonitrile at room temperature afforded oxidized and oxygenated products and a solvent-bound complex, [Ru(H+TPA)(bpy)(CH3CN)], which is intact in the presence of alcohols. The oxygenation reaction of saturated C–H bonds with 2 proceeds by two-step processes: the hydrogen abstraction with 2, followed by the dissociation of the alcohol products from the oxygen-rebound complexes, Ru(III)-alkoxo complexes, which were successfully detected by ESI-MS spectrometry. The kinetic isotope effects in the first step for the reaction of dihydroanthrathene (DHA) and cumene with 2 were determined to be 49 and 12, respectively. The second-order rate constants of C–H oxygenation in the first step exhibited a linear correlation with bond dissociation energies of the C–H bond cleavage.

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