MU-LIGAND-MU-PEROXO-DICOBALT(III) CATIONS

Potentiometric, ultraviolet-visible, and nuclear magnetic resonance studies of the oxygenation of aqueous solutions of 5: 2 and 3: 1 molar ratios of ethylenediamine (en) to Co(II) indicate that the equilibrium product is tetrakis(ethylenediamine)-³-(ethylenediamine)-³-peroxo-dicobalt(III) (I). The log of the overall formation constant of I is 37.1 (M6atm1). Studies also indicate the oxygenation of 2: 2: 1 and 2: 1: 3 Co(II) to triethylenetetramine (trien) to ethylenediamine solutions results in the formation of [Co2trien(en)(O2)4+] (II) and of I and II, respectively. © 1979, American Chemical Society. All rights reserved.