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• W2951532220 startingPage "3380" @default.
• W2951532220 abstract "Treatment of [RuCl3(PPh3)3] with 1-(arylazo)naphthol ligands in benzene under reflux afford air-stable new organoruthenium(III) complexes with general composition [Ru(an-R)Cl(PPh3)2] (where, R = H, Cl, CH3, OCH3, OC2H5) in fairly good yield. The 1-(arylazo)naphtholate ligands behave as dianionic tridentate C, N, O donors and coordinates to ruthenium through phenolic oxygen, azo nitrogen and ortho carbon generate two five-membered chelate rings. The composition of the complexes have been established by analytical (elemental analysis and magnetic susceptibility measurement) and spectral (FT-IR, UV–Vis, EPR) methods. The complexes are paramagnetic (low-spin, d5) in nature and in dichloromethane solution show intense d–d transitions and ligand-to-metal charge transfer (LMCT) transitions in the visible region. The solution EPR spectrum of complex [Ru(an-CH3)Cl(PPh3)2] (3) in dichloromethane at 77 K shows rhombic distortion around the ruthenium ion with three different ‘g’ values (gx ≠ gy ≠ gz). The single crystal structure of the complex [Ru(an-OCH3)Cl(PPh3)2] (4) has been characterised by X-ray crystallography, indicates the presence of a distorted octahedral geometry in these complexes. All the complexes exhibit one quasi-reversible oxidative response in the range 0.60–0.79 V (RuIV/RuIII) and two quasi-reversible reductive responses (RuIII/RuII; RuII/RuI) within the range −0.50 to −0.62 V and −0.93 to −0.98 V respectively. The formal potential of all the couples correlate linearly with the Hammett constant of the para substituent in arylazo fragment of the 1-(arylazo)naphtholate ligand. Further, the catalytic efficiency of one of the ruthenium complexes (4) was determined for the transfer hydrogenation of ketones with an excellent yield up to 99% in the presence of isopropanol/KOH." @default.
• W2951532220 created "2019-06-27" @default.
• W2951532220 creator A5018073672 @default.
• W2951532220 creator A5020549391 @default.
• W2951532220 creator A5087099396 @default.
• W2951532220 date "2007-07-01" @default.
• W2951532220 modified "2023-10-16" @default.
• W2951532220 title "Ruthenium(III) mediated C–H activation of azonaphthol: Synthesis, structural characterization and transfer hydrogenation of ketones" @default.
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• W2951532220 doi "https://doi.org/10.1016/j.jorganchem.2007.04.042" @default.
• W2951532220 hasPublicationYear "2007" @default.
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