Protonation of [{Mn IV (saltn)(µ-O)} 2 ] results in significant modification of structure and catalase-like reactivity

Protonation of an {MnIV(µ2-O)}2 core to form {(MNIV)2(µ2-O)(µ2-OH)} leads to perturbations of the physical properties of this unit including an increase in metal–metal separation (ca. 0.1 Å) and loss of catalase reactivity.