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

doi:10.1039/c5dt04723d

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

Chemistry

Research output: Contribution to journal › Article › peer-review

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)Co^I-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 language	English (US)
Pages (from-to)	9805-9811
Number of pages	7
Journal	Dalton Transactions
Volume	45
Issue number	24
DOIs	https://doi.org/10.1039/c5dt04723d
State	Published - Jan 1 2016

ASJC Scopus subject areas

Inorganic Chemistry

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10.1039/c5dt04723d

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Monoanionic bis(carbene) pincer complexes featuring cobalt(I-III) oxidation states. / Ibrahim, Abdulrahman D.; Tokmic, Kenan; Brennan, Marshall R.; Kim, Dongyoung; Matson, Ellen M.; Nilges, Mark J.; Bertke, Jeffery A.; Fout, Alison R.

In: Dalton Transactions, Vol. 45, No. 24, 01.01.2016, p. 9805-9811.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Ibrahim, Abdulrahman D.

AU - Tokmic, Kenan

AU - Brennan, Marshall R.

AU - Kim, Dongyoung

AU - Matson, Ellen M.

AU - Nilges, Mark J.

AU - Bertke, Jeffery A.

AU - Fout, Alison R.

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N2 - 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.

AB - 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.

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