Photochemical Oxygenation Reactions of Cobalt(III)-Amine Complexes in Aqueous and Non-Aqueous Solvents: Formation of μ-Peroxo Dinuclear Complexes of Cobalt(II)

Abstract

Steady-state photolysis of a series of cobalt(llI)-amine complexes, dissolved
in neutral air equilibrated aqueous and non-aqueous solvents, with
254 nm penray lamp, leads to the oxygenation of the photoproduced cobalt
(II) amine complexes. The study indicates that the photoproduced cobalt
(II)-amine complexes upon reaction with molecular oxygen form a
superoxo complex that reacts with the starting complex to give a  μ-superoxo
dinuclear complex. Subsequently the μ-superoxo complex gives the
final product, the  μ-peroxo dinuclear complex at room temperature. But
in aqueous acidic solution the final photoproduct is cobalt(lI) aqua complex.