Oxygen-18 exchange of µ-peroxo-dicobalt(III) complexes

Abstract

The rate of exchange of oxygen-18 in [(tren)-(MeNH₂)Co(µ-¹⁸O₂)Co(tren)(MeNH₂)]⁴⁺(1b)(t_½ca. 700 s)[tren = tris-(2-aminoethyl)amine] has been found to be the same as both the rate of decomposition by acids to cobalt (II) and O₂, and the rate of formation of [(tren)Co-]µ-O₂,µ-OH(Co(tren)]³⁺ from (1b) in neutral or alkaline solution, indicating that a cobalt(II) compelx is a common intermediate; the rate of exchange of [(tren)Co(µ-O₂,-µ-OH)Co(tren)]³⁺ is very much slower.