PANJA, Anangamohan; GUIONNEAU, Philippe

doi:10.1039/c3dt32788d

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PANJA, Anangamohan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Panskura Banamali College

GUIONNEAU, Philippe
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Dalton Transactions. 2013, vol. 42, n° 14, p. 5068-5075

Royal Society of Chemistry

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A bis(imido)-bridged dinuclear cobalt(iii) complex, [Co(amp)(μ-imp)Cl]Cl*2HO () [amp = 2-aminomethylpyridine; imp = 2-iminomethylpyridine anion], was synthesized by the reaction of cobalt(ii) chloride with 2-aminomethylpyridine in the presence of alkaline hydrogen peroxide at room temperature. X-ray crystallography reveals that both the metal centres in the molecule are related to each other through an inversion centre, and the geometry of each of the Co ions is a distorted octahedral structure having a CoNCl coordination environment. The most important feature of the structure is the modification of half of the coordinated amines by the oxidative dehydrogenation process which involves double bridging in the complex cation. To the best of our knowledge, this is the first example of a bis(imido)-bridged dinuclear cobalt(iii) complex derived from metal-assisted oxidative dehydrogenation of the coordinated primary amine ligand. Complex was found to be an excellent functional model for the phenoxazinone synthase, catalyzing the oxidative coupling of 2-aminophenol to the corresponding 2-aminophenoxazinone chromophore in dioxygen saturated methanol. The detailed kinetic investigations reveal that the phenoxazinone chromophore is produced via a potential complex-substrate intermediate.< Réduire

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Copper compounds

Crystallography

X-ray diffraction

Chemical structure

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The first example of a centro-symmetrical bis(imido)-bridged dinuclear cobalt(iii) complex: synthesis via oxidative dehydrogenation and phenoxazinone synthase activity

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