1. Thermodynamics of the Reversible Oxygenation of Bis (Acetylacetone)-Ethylenediiminecobalt (II) in Pyridine
- Author
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G. Costa, Maurizio Brunori, G. Tauzher, Gino Amiconi, and Eraldo Antonini
- Subjects
Multidisciplinary ,Myoglobin ,Pyridines ,Ligand ,Acetylacetone ,chemistry.chemical_element ,Cobalt ,Photochemistry ,Oxygen ,Reversible reaction ,Acetone ,Hemoglobins ,chemistry.chemical_compound ,Models, Chemical ,chemistry ,Pyridine ,Thermodynamics ,Molecule ,Oxidation-Reduction ,Stoichiometry ,Oxygen binding ,Chelating Agents - Abstract
THE reversible reaction of certain cobalt chelates with molecular oxygen can be considered as a simple model of the reversible oxygen binding by haemoglobin and myoglobin1,2. It was recently pointed out3–6 that in suitable experimental conditions synthetic oxygen carriers show a reaction stoichiometry corresponding to one oxygen molecule per metal atom. In both cases the six-coordinated complex with oxygen can be formed by an equatorial tetradentate chelating agent and a donor ligand in the axial position trans to oxygen4. The reversibility of oxygenation seems to depend on a non-polar environment of the metal provided by the aprotic solvents in the simple complexes and by the hydrophobic pocket accommodating the haem in haemoglobin7.
- Published
- 1970
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