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Issue 33, 2017
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Controlling the oxidation of bis-tridentate cobalt(II) complexes having bis(2-pyridylalkyl)amines: ligand vs. metal oxidation

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Abstract

Two bis-tridentate chelated cobalt(II) complexes, which differ in the ligand structure by a methylene group, activate molecular oxygen (O2), and give different oxidation products. The O2 reaction of [CoII(pepma)2]2+ (1) with unsymmetrical 2-(2-pyridyl)-N-(2-pyridylmethyl)ethanamine (pepma) results in ligand oxidation, to the corresponding Co(II) imine complex [CoII(pepmi)2]2+ (2). Contrastingly, the Co(II) complex [CoII(bpma)2]2+ (3) of similar symmetrical bis(2-pyridylmethyl)amine (bpma), undergoes metal oxidation, yielding a cobalt(III) complex, [CoIII(bpma)2]2+ (4). The reversibility of the amine to imine conversion and the stability of the Co(II) imine complex (2) are investigated. Furthermore, the solution dynamics of Co(II) complexes are highlighted with the help of paramagnetic 1H-NMR spectroscopy.

Graphical abstract: Controlling the oxidation of bis-tridentate cobalt(ii) complexes having bis(2-pyridylalkyl)amines: ligand vs. metal oxidation

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Publication details

The article was received on 17 May 2017, accepted on 24 May 2017 and first published on 25 May 2017


Article type: Paper
DOI: 10.1039/C7DT01792H
Citation: Dalton Trans., 2017,46, 10830-10836
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    Controlling the oxidation of bis-tridentate cobalt(II) complexes having bis(2-pyridylalkyl)amines: ligand vs. metal oxidation

    S. Anjana, S. Donring, P. Sanjib, B. Varghese and N. N. Murthy, Dalton Trans., 2017, 46, 10830
    DOI: 10.1039/C7DT01792H

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