A benzoate bridged dinuclear mixed valence cobalt(III/II) complex with CoIIIO4CoII core: Synthesis, structure and investigation of its phenoxazinone synthase mimicking activity

A dinuclear class-I mixed valence cobalt(III)/cobalt(II) complex, [(N-3)(CoL)-L-III(mu-C6H5COO)Co-II(N-3)]center dot CH3OH [where H2L = (1,3-propanediyl)bis(iminomethylene)bis(6-methoxyphenol)] has been prepared and characterized by elemental and spectral analysis. The structure of the complex has been confirmed by single crystal X-ray diffraction analysis. The cobalt(III) center is placed in the inner N2O2 compartment, whereas cobalt(II) center is present in the outer O-4 compartment of the ligand. The complex may act as active functional model for the oxidation of 2-aminophenol to 2-aminophenoxazine-3-one with k(cat) = 153.90 h(-1). (C) 2019 Elsevier Ltd. All rights reserved.