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.^[3]

Manganese(II) perchlorate

Names
Other names Manganous perchlorate Manganese diperchlorate
Identifiers
CAS Number	13770-16-6
3D model (JSmol)	Interactive image
ChemSpider	146029
EC Number	237-390-9
PubChem CID	166899
InChI InChI=1S/2ClHO4.Mn/c2*2-1(3,4)5;/h2*(H,2,3,4,5);/q;;+2/p-2
SMILES [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Mn+2]
Properties
Chemical formula	Mn(ClO4)2
Molar mass	253.84 g/mol
Appearance	White solid (anhydrous) Rose-colored solid (hexahydrate)
Density	2.10 g/cm3
Melting point	150 °C (302 °F; 423 K)[1] (decomposes, hexahydrate)
Solubility in water	292 g/100 mL (25 °C)[2]
Hazards
GHS labelling:
Pictograms
Signal word	Danger
NFPA 704 (fire diamond)	1 0 2 OX
Related compounds
Other cations	Iron(II) perchlorate Cobalt(II) perchlorate Nickel(II) perchlorate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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.^[4][1]

To produce the anhydrous form, manganese(II) nitrate is reacted with dichlorine hexoxide at 5 °C:^[3]

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.^[3]

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.^[3]

The hexahydrate consists of discrete [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.^[4][5]