Abstract
Oxygenation of the heme complex of poly(1-vinyl-2-methylimidazole) (PMI) was studied in organic solvents containing 10 vol% water at −30°C. The life-time of the oxygen adduct was prolonged in 10 vol% water/N,N–dimethylacetamide and N-methylpyrrolidone but oxygenation was not observed in the following 10 vol% water/alcohols: ethanol, butanol, and ethylene glycol. This shows a correlation to the proton accepting ability of organic solvents. The oxygen adduct was formed even in an aqueous medium for the heme complexes bound to poly(1-vinyl-2-methylimidazole-co-N,N,-dimethylacrylamide) and poly(1-vinyl-2-methylimidazole-co-1-vinyl-pyrrolidone) at −30°C but not for heme complexes bound to the ionic copolymers: poly(1-vinyl-2-methylimidazole-co-methacrylic acid) and poly(1-vinyl-2-methylimidazole-co-1-vinyl-2-methyl-3-benzylimidazolium chloride).
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