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Issue 24, 2016
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Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states

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Abstract

The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene (ArCCC, Ar = 2,6-diispropylphenyl or mesityl) are reported. Cleavage of the aryl C–H bond of the ligand was achieved in a one-pot metalation procedure using Co(N(SiMe3)2)2(py)2, an equivalent of exogenous base, and trityl chloride to form the (DIPPCCC)CoCl2py complex. This species could be reduced to the Co(II) and Co(I)–N2 molecules with the appropriate equivalents of reductant. Subsequent generation of (MesCCC)CoI–III derivatives with the mesityl ligand proceeded in good yields. A suite of characterization techniques and the interconversion between all three oxidation states of the cobalt complexes is described.

Graphical abstract: Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states

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Publication details

The article was received on 02 Dec 2015, accepted on 08 Jan 2016 and first published on 18 Jan 2016


Article type: Paper
DOI: 10.1039/C5DT04723D
Dalton Trans., 2016,45, 9805-9811

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    Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states

    A. D. Ibrahim, K. Tokmic, M. R. Brennan, D. Kim, E. M. Matson, M. J. Nilges, J. A. Bertke and A. R. Fout, Dalton Trans., 2016, 45, 9805
    DOI: 10.1039/C5DT04723D

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