Dioxygen binding by cobalt(ii)‎ complexes of 8,8'-bis(aminomethyl)‎-2,2'-biquinoline

الملخص EN

A new series of Co (II) complexes of the type CoLX2, where L is a tetra-dentate ligand 8,8'-bis(aminomethyl)-2,2'-biquinoline and X = SCN-, BF4-, I- or NO3-, have been synthesized and characterized.

The complexes have magnetic moments in the range typical of a low-spin d7 Co (II) center.

The interaction of these Co (II) complexes with dioxygen was studied by E.S.R.

spectroscopy.

A dicobalt (III) peroxo-bridged complex was formed in DMF solution, associated with the formation of an E.S.R.-silent solution compatible with the formation of low-spin d6 Co (III) species.

Similar behavior was also observed for the interaction of these Co (II) complexes with dioxygen in the presence of ancillary ligands such as pyridine and 2-methylimidazole.

The dioxygen complexes proved successful as oxygen carrier oxidation catalysts for tripehnylphosphine and 2,6-bis(t-butyl)phenol.