High oxygen-binding affinity of poly(4-vinylimidazole-co-octylmethacrylate)-cobaltporphyrin complex: Effect of hydrogen-bond at the imidazole residue

The oxygen-binding affinity of the cobalt-picketfence-porphyrin (CoP) ligat ed with imidazole was enhanced in the presence of an additive which forms a hydrogen-bond with the ligated imidazole. The CoP complex with poly(4(5)-v inylimidazole-co-octylmethacrylate) rapidly and reversibly bound oxygen and showed very high oxygen-binding affinity. The oxygen transport in the CoP- polymer membrane was efficiently facilitated.