A linear trinuclear mixed oxidation state cobalt(III/II/III) complex with pyrazolate bridging ligands

A linear, trinuclear cobalt complex with pyrazolate bridges has been prepared and structurally characterised. The outer cobalt centre is low spin, octahedral cobalt(III) and is coordinated by a tetra-anionic tetradentate ligand. Two of these outer cobalt(III) complexes act as bidentate chelating ligands to the central cobalt(II) ion, which adopts a distorted, flattened, tetrahedral geometry.