Reaktivität von Koordinationsverbindungen, XXI: Zur Reversibilität der Bindung von molekularem Sauerstoff an Kobalt(II)-Chelate

Abstract

The dissociation of a binuclear cobalt(II)-chelate of triethylenetetramine (trien) with O₂ and OH⁻ as bridging ligands has been studied in different salt media. At pH 2 in the presence of Cl⁻ the O₂-adduct dissociates reversibly to Co²⁺, trien and O₂. On the contrary, SO₄²⁻ causes partial irreversible oxidation to Co^III(trien)³⁺. In the latter case formation of a highly reactive cobalt(III)peroxo intermediate has been proved. Ion pair formation must be accounted for the different behaviour in Cl⁻ and SO₄²⁻-solutions.