Spectrophotometric and electrochemical investigations of (tetrakis(1-methylpyridinium-4-yl)porphine)iron(III) ion in aqueous solution.

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Author(s)

    • Ando Isao
    • Department of Chemistry, Faculty of Science, Fukuoka University
    • Saita Minoru
    • Department of Chemistry, Faculty of Science, Fukuoka University
    • Nishino Rika
    • Department of Chemistry, Faculty of Science, Fukuoka University

Abstract

The equilibria among the species of [tetrakis(1-methylpyridinium-4-yl)porphine]iron(III) ion (Fe(III)–TMPyP) in aqueous solution and the redox reactions of their central metals were investigated by means of spectrophotometric, electrochemical and spectroelectrochemical methods. Two acid-dissociation equilibria involving three monomeric species of Fe(III)–TMPyP were found: one with a p<I>K</I><SUB>a</SUB> of 5.5 and the other with a p<I>K</I><SUB>a</SUB> of <I>ca.</I> 12. After electrochemical reduction, an equilibrium between two monomeric species of Fe(II)–TMPyP with a p<I>K</I><SUB>a</SUB> of 11 was observed. In the Fe(III)–TMPyP solution at relatively high concentration, two additional different species, probably dimeric, were found in the pH regions of 5–8 and 9–13, respectively. The consistency of specification of the species with the scheme of redox reactions is discussed.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 55(11), 3515-3519, 1982

    The Chemical Society of Japan

Codes

  • NII Article ID (NAID)
    130001986685
  • Text Lang
    ENG
  • ISSN
    0009-2673
  • Data Source
    J-STAGE 
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