A series of mixed sandwich complexes of the type [Co(9S3)(CpR)](ClO4)2 or [Co(9N3)(CpR)](ClO4)2, where 9S3 = 1,4,7-trithiacyclononane, 9N3 = 1,4,7-triazacyclononane, and CpR = cyclopentadienide (Cp) or pentamethylcyclopentadienide (Cp*), have been prepared and characterized. These complexes are readily prepared by refluxing [Co(CpR)(I)2(CO)] with 1 equivalent of either 9S3 or 9N3 followed by methathesis with perchlorate anion. The complexes are vividly colored orange for [Co(9X3)(CpR)](ClO4)2 where X = S and R = Cp* or X = NH and R = Cp or Cp*, and red for X = S and R = Cp. All complexes have been characterized by 1H-NMR and 13C-NMR spectroscopy, and a crystal structure of [Co(9S3)(Cp)](PF6)2 was obtained via single-crystal X-ray diffraction. Details on the preparation and characterization of these complexes, which includes multi-nuclear NMR spectroscopy, UV-vis spectroscopy, and cyclic voltammetry, will be presented. Preliminary results of the reactivity of a tridentate N-heterocylic carbene ligand, hydrotris(3-methyl-imidazole-2-yliden-1-yl)borate, with [Co(CpR)(I)2(CO)] will also be presented.

Synthesis and characterization of cyclopentadienyl- and pentamethylcyclopentadienyl-Co(III) mixed sandwich compounds containing either tridentate nitrogen, sulfur, or carbon donor ligands

249th National Meeting (2015)

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