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

Eishun Tsuchida, Hiroyuki Nishide, Hiroyuki Yokoyama

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2383-2387
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number11
DOIs
Publication statusPublished - 1984

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Heme
Oxygen
Copolymers
Molecular weight
pH
Imidazoles
Oxygenation
Ethylene Glycol
Equilibrium constants
Urea
Rate constants
Alcohols
Oxidation
1-vinylimidazole

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Reversible oxygen binding by the complex of poly(2-methyl-1-vinylimidazole) and heme in cold aqueous media. / Tsuchida, Eishun; Nishide, Hiroyuki; Yokoyama, Hiroyuki.

In: Journal of the Chemical Society, Dalton Transactions, No. 11, 1984, p. 2383-2387.

Research output: Contribution to journalArticle

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AB - 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.

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