Thermodynamics of Ligand and Oxygen Binding to Cobalt Protoporphyrin IX Dimethyl Ester in Toluene Solution

Dennis V. Stynes, H. Cleary Stynes, R. Brian, James A Ibers

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Thermodynamic data for the binding of ligands to cobalt(II) protoporphyrin IX dimethyl ester (CoP) are presented. Data for formation of the five-coordinate complex LCoP are compared with thermodynamic data for the reversible binding of oxygen (1:1) to LCoP. Enhanced oxygen binding to LCoP for L = imidazole, 1-methylimidazole, and N,N-dimethylformamide is discussed in terms of the π-donor properties of these ligands. Spectral data for the formation of five- and six-coordinate Co(II) complexes are presented, as well as data for the 1:1 oxygen adducts and peroxo-bridged complexes.

Original languageEnglish (US)
Pages (from-to)1796-1801
Number of pages6
JournalJournal of the American Chemical Society
Issue number6
Publication statusPublished - Mar 1 1973


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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