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

Abdulrahman D. Ibrahim, Kenan Tokmic, Marshall R. Brennan, Dongyoung Kim, Ellen M. Matson, Mark J. Nilges, Jeffery A. Bertke, Alison R. Fout

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)9805-9811
Number of pages7
JournalDalton Transactions
Issue number24
StatePublished - Jan 1 2016

ASJC Scopus subject areas

  • Inorganic Chemistry

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