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Distal ligand’s effect on the deprotonation of [MnSalen-H2O2] (a) along with the variant pHs. “b” and “c” show the possible H-bond formation between H2O2 (α-H) and His64 in acidic and basic sides of pKa (5.0) in 1·Mb, respectively. “d” shows the possible H-bond formation between H2O2 (β-O) and Arg64 in 1·Mb(H64R).
