Manganese tetrafluoride, MnF4, is the highest fluoride of manganese and is a powerful oxidizing agent that is used as a means of purifying elemental fluorine.
Preparation
Through the reaction of MnF2 (or other Mn(II) compounds) with a stream of fluorine gas at 550℃: the MnF4 sublimed into the gas stream and was condensed onto a cold finger.