THE SYNTHESIS, CHARACTERIZATION AND DIOXYGEN AFFINITY OF PILLARED COBALT COMPLEXES DERIVED FROM THE GLYOXIMATO LIGAND FAMILY

Dioxime platforms for cobalt dioxygen carriers are extended to those h aving diphenylboron linkages in the macrocycle by replacing the proton s of the bis(alpha-dioxime) parent ligand systems, in analogy to those having BF2+ linkages. The electron releasing character of the BPh(2)( +) as compared to BF2+, is evident in greatly increased dioxygen affin ities. Finer tuning of the dioxygen affinity is achieved by replacing the methyl groups of the dimethylglyoximato groups with the diphenyl d erivatives. The steric demands of the phenyl groups also inhibit autox idation of these new dioxygen carriers.