and is also a common ingredient in dry cell batteries. Complexes of Mn(IV), such as in K₂[MnF₆], are known but are rarer than those of manganese in the lower oxidation states. Mn(IV)-OH complexes are an intermediate in some enzymes, including the oxygen-evolving center (OEC) in plants.

Simple derivatives of Mn³⁺ are rarely encountered but can be stabilized by suitably alkaline