Cobalt(III) complex with a redox non-innocent bis (o-aminophenol).

The redox non-innocent ligand bis(o -aminophenol) N,N′-bis(3,5-di-tertbutyl-2-hydroxy-phenyl)-1,2-phenylenediamine and CoCl 2 ⋅6H 2 O react in a methanol solution under aerobic conditions to form a paramagnetic Co(III) complex. [Display omitted] • Low-spin Co(III) complex with a redox non-innocent ligand. • Paramagnetic complex with an unpaired electron on the ligand. • Metrical oxidation state and bond valence sum calculations verify the + III oxidation state. The redox non-innocent ligand bis(o -aminophenol) N,N′-bis(3,5-di-tertbutyl-2-hydroxy-phenyl)-1,2-phenylenediamine, H 4 L, reacts with CoCl 2 ⋅6H 2 O in a methanol solution under aerobic conditions to form [Co(HL) 2 ]. Both bis(o -aminophenol) ligands coordinate as tridentate and the ligand set can be described as a resonance structure of two partially oxidized ligands, while the formal oxidation state of the metal centre appears as + III. In this resonance structure, one ligand carries an odd electron, which makes the Co(III) complex paramagnetic. [ABSTRACT FROM AUTHOR]