Some aspects of the radiolysis of cobalt(II) iminodiacetate in aqueous solution

Abstract

The radiolysis of cobalt(II) iminodiacetate has been studied. Both pulse radiolysis and product analysis after γ-irradiation indicate that OH attack proceeds 55% at the metal ion in the complex and 45% at the ligand. The rate constant for the overall reaction is 5.8 × 10⁸ dm³ mol^–1 s^–1; that for metal-ion oxidation is 3.2 × 10⁸ dm³ mol^–1 s^–1 and for hydrogen abstraction from the ligand is 2.6 × 10⁸ dm³ mol^–1 s^–1. The ions Br₂^– and O₂^– react with the complex wholly via oxidation of the metal ion, with rate constants of 8.9 × 10⁷ and 3.0 × 10⁷ dm³ mol^–1 s^–1 respectively.