Iron-ligand bonding properties of synthetic iron-porphyrin complexes with oxygen transporting ability in aqueous media

Eishun Tsuchida, Hiromi Maeda, Makoto Yuasa, Hiroyuki Nishide, Hidenari Inoue, Tsuneo Shirai

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Abstract

Mössbauer spectra, i.r. spectra (Fe-CO stretching), and photodissociation quantum yields of the oxygen and CO adducts were measured for synthetic iron-porphyrin complexes with oxygen transporting ability in aqueous media: the 5,10,15,20-tetra{α-o-[2′,2′-dimethyl-20′-(2″- trimethyl-ammonioethylphosphonatoxy)eicosanamido]phenyl}porphyrinatoiron(II) (lipid-heme) complex of 1-laurylimidazole (lauryl = dodecyl) or 1-lauryl-2-methylimidazole embedded in the bilayer of phospholipid liposome (abbreviated as liposome-lipid-heme) and the tetradecyl-substituted copper-iron(II)-diporphyrin (diheme) complex of 1-laurylimidazole solubilized in a surfactant micelle (micelle-diheme). The quadrupole splitting (ΔEQ) for the CO adduct of the diheme indicated a large electric-field gradient at the iron nucleus, probably due to steric hindrance of the diheme structure. Its CO-stretching vibration (νCO) and photodissociation quantum yield (Φ), obtained by flash photolysis, were similar to those of carboxy hemoproteins and suggested the distorted ligation of CO to Fe. Mössbauer parameters for the oxygen adducts of liposome-lipid-heme and micelle-diheme in aqueous media agreed with those for the oxy hemoproteins.

Original languageEnglish
Pages (from-to)2455-2458
Number of pages4
JournalJournal of the Chemical Society, Dalton Transactions
Issue number10
DOIs
Publication statusPublished - 1987

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ASJC Scopus subject areas

  • Chemistry(all)

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