Manganese(II) perchlorate

Manganese(II) perchlorate is an inorganic chemical compound with the formula Mn(ClO4)2. It forms a white-colored anhydrous and a rose-colored hexahydrate, both of which are hygroscopic. As a perchlorate, it is a strong oxidizing agent.

Production and reactions
The hexahydrate can be produced by reacting manganese metal or manganese(II) carbonate with perchloric acid, followed by the evaporation of the solution. The hexahydrate does not dehydrate when heating but instead oxidizes to manganese dioxide at 150 °C.

To produce the anhydrous form, manganese(II) nitrate is reacted with dichlorine hexoxide at 5 °C:
 * Mn(NO3)2 + 4 Cl2O6 → NO2Mn(ClO4)3 + NO2ClO4 + 4 ClO2 + O2

The resulting nitryl salt is subsequently heated at 105 °C in a vacuum to produce the anhydrous perchlorate.
 * NO2Mn(ClO4)3 → Mn(ClO4)2 + NO2ClO4

Structure
The anhydrous form is predicted to be isostructural with cobalt(II) perchlorate, based on the IR spectrum and the Raman spectrum of the compound.

The hexahydrate consists of discreet [Mn(H2O)6]2+ octahedrons and perchlorate anions with lattice constants a = 7.85 Å, b = 13.60 Å and c = 5.30 Å. The hexahydrate undergoes phase transitions at low temperatures.