Tuning the MnII2/MnIII2 redox cycle of a phenoxo-bridged diMn catalase mimic with terminal carboxylate donors

The phenoxo-bridged complex Na[Mn2L(OH)2(H2O)2], where L5− = 5‑methyl‑2‑hydroxo‑1,3‑xylene‑α,α‑diamine‑N,N,N′,N′‑tetraacetato, catalyzes H2O2 disproportionation involving a MnIII2/MnII2 redox cycle, a behavior that distinguishes this catalyst from other phenoxo-bridged diMn complexes with terminal pyridyl or pyridyl/carboxylato donors that cycle between MnIIMnIII/MnIIIMnIV species.60