Monomeric dioxygen complex of cobalt(II)substituted cytochrome c peptides in aqueous solution

Abstract

As an artificial oxygen carrier, cobalt-substituted cytochrome c peptide was prepared, reaction of which with dioxygen yielded a stable monomeric oxygenate complex at room temperature; the e.s.r. signal (g_⊥= 2.276) resulting from the deoxygenated form disappeared upon oxygenation and concomitantly a strong axially symmetrical e.s.r. spectrum with g⊥= 2.003 appeared, suggesting the structure Co^IIIO₂˙^–even in aqueous solution.