Chiral bidentate amine and facially coordinating carbocyclic ligands have been used to prepare and characterize mixed coordination sphere cobalt(III) complexes. The integration of this mixed ligand environment along with the Earth abundant cobalt metal in a high oxidation state has the potential for interesting reactivity. Complexes of the type [Co(CpR)(X-DPEN)(I)](I), where CpR = cyclopentadienyl (Cp) or pentamethylcyclopentadienyl (Cp*) and X = meso-1,2-, 1R,2R-, and 1S,2S-, have been prepared by ligand substitution from [Co(CpR)(I)2(CO)] with 1,2-diphenylethylendiamine (DPEN). The outer sphere iodide is readily exchangeable with tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBArF) while both the inner and outer sphere iodides can be exchanged with a coordinating anion such as acetate (AgOAc). All iodide containing complexes are isolated as analytically pure diamagnetic black-dark purple solids, and in the case of acetate complexes, light purple solids. The structures of several cobalt complexes, which includes [Co(Cp*)(R,R-DPEN)(OAc)](OAc), have been established by single-crystal X-ray crystallography and will be described in detail.

Synthesis, characterization, and reactivity of organometallic cobalt(III) complexes that possess bidentate chiral amine ligands

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