Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states. Issue 24 (18th January 2016)

• Record Type: Journal Article
• Authors: Ibrahim, Abdulrahman D.; Tokmic, Kenan; Brennan, Marshall R.; Kim, Dongyoung; Matson, Ellen M.; Nilges, Mark J.; Bertke, Jeffery A.; Fout, Alison R.
• Is Part Of: Dalton transactions. Volume 45:Issue 24(2016)
• Page Start: 9805
• Page End: 9811
• Publication Date: 2016-01-18
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt04723d
• Languages: English
• ISSNs: 1477-9226

Abstract

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 ( Ar CCC, Ar = 2, 6-diispropylphenyl or mesityl) are reported. 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 ( Ar CCC, 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 ( DIPP CCC)CoCl2 py complex. This species could be reduced to the Co(ii ) and Co(i )–N2 molecules with the appropriate equivalents of reductant. Subsequent generation of ( Mes CCC)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.