Mn(V)(O) versus Cr(V)(O) Porphyrinoid Complexes: Structural Characterization and Implications for Basicity Controlling H‑Atom Abstraction

Isomorphous
crystals of MnV(O) and CrV(O)
corrolazines were characterized by single crystal X-ray diffraction.
Reactivity studies with H atom donors and separated PCET reagents
show a dramatic difference in H atom abstracting abilities for these
two complexes. The implied large difference in driving force is opposite
the trend in redox potentials, indicating that basicity is a key factor
in determining the striking difference in reactivity for two metal-oxo
species in identical ligand environments.