Reversible oxygen binding by the complex of poly(2-methyl-1-vinylimidazole) and heme in cold aqueous media

Eishun Tsuchida, Hiroyuki Nishide, Hiroyuki Yokoyama

研究成果: Article

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Poly(2-methyl-1-vinylimidazole), molecular weight > 104, forms a stable five-co-ordinated complex with heme in aqueous ethylene glycol solution. This complex gave an oxygen adduct at -30 °C, whereas an irreversible oxidation was observed for low-molecular-weight heme complexes with 2-methyl-imidazoles and for the six-co-ordinated heme complex with poly(1-vinylimidazole). Oxygenation was also observed for heme complexes with copolymers of 2-methyl-1-vinylimidazole but not for those with ionic copolymers. The lifetime of the oxygen adduct decreased with increasing hydrogen-ion concentration and upon adding alcohol or urea. Oxygen-binding and -dissociation rate constants and oxygen-binding equilibrium constants were also measured in cold aqueous media.

元の言語English
ページ(範囲)2383-2387
ページ数5
ジャーナルJournal of the Chemical Society, Dalton Transactions
発行部数11
DOI
出版物ステータスPublished - 1984

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ASJC Scopus subject areas

  • Chemistry(all)

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