Synthesis and Structural Features of Co(II) and Co(III) Complexes Supported by Aminotrisphenolate Ligand Scaffolds

Co­(II) complexes of aminotrisphenolate ((ArO)<sub>3</sub>N<sup>3–</sup>) ligands can be prepared straightforwardly in high yield. X-ray analysis reveals these complexes to comprise of two different hemispheres, one containing an anionic Co­((ArO)<sub>3</sub>N)<sup>−</sup> and the other a cationic (ArO)<sub>3</sub>NH<sup>+</sup> unit, which are associated through hydrogen bonding. These Co­(II) complexes can be easily converted into their Co­(III) analogues in air in the presence of suitable bases such as dimethylaminopyridine and 2,2′-bipyridine, and the structural features and magnetic properties of these latter compounds are also reported.