The synthesis of new binucleating polyaza macrocyclic and macrobicyclic ligands: dioxygen affinities of the cobalt complexes

Six macrocyclic and five macrobicyclic Schiff bases have been synthesized by condensation of rigid dialdehydes with diethylenetriamine or tris (aminoethyl) amine, and have been reduced to the corresponding saturated hexaaza macrocyclic complexes or octaaza macrobicyclic complexes. Six of the dicobalt complexes of these new ligands were found to be oxygen carriers.