Manganese(IV) fluoride hydrofluoric acid. The pentafluoromanganate(1−) salts of potassium, rubidium and caesium, MMnF, can be prepared by fluorination of MMnF or by the reaction of [MnF(py)(HO)] with MF. The lemon-yellow heptafluoromanganate(3−) salts of the same metals, MMnF, have also been prepared. Manganese(IV) fluoride Manganese tetrafluoride, MnF, is the highest fluoride of manganese. It is a powerful oxidizing agent and is used as a means of purifying elemental fluorine. Manganese tetrafluoride was first unequivocally prepared in 1961 by the reaction of manganese(II) fluoride (or other Mn compounds) with a stream of fluorine gas at 550 °C: the MnF sublimes into the gas stream
Manganese dioxide chlorine as a by-product. A third process involves manganese heptoxide and manganese monoxide. The two reagents combine with a 1:3 ratio to form manganese dioxide: Lastly the action of potassium permanganate over manganese sulphate crystals produces the desired oxide. Electrolytic manganese dioxide (EMD) is used in zinc–carbon batteries together with zinc chloride and ammonium chloride. EMD is commonly used in zinc manganese dioxide rechargeable alkaline (Zn RAM) cells also. For these applications, purity is extremely important. EMD is produced in a similar fashion as electrolytic tough pitch (ETP) copper: The manganese dioxide is dissolved in sulfuric acid (sometimes mixed with