• Source: Cobalt(II) perchlorate

Cobalt(II) perchlorate is an inorganic chemical compound with the formula Co(ClO4)2·nH2O (n = 0,6). The pink anhydrous and red hexahydrate forms are both hygroscopic solids.




Preparation and reactions


Cobalt(II) perchlorate hexahydrate is produced by reacting cobalt metal or cobalt(II) carbonate with perchloric acid, followed by the evaporation of the solution:

CoCO3 + 2 HClO4 → Co(ClO4)2 + H2O + CO2
The anhydrous form cannot be produced from the hexahydrate by heating, as it instead decomposes to cobalt(II,III) oxide at 170 °C. Instead, anhydrous cobalt(II) perchlorate is produced from the reaction of dichlorine hexoxide and cobalt(II) chloride, followed by heating in a vacuum at 75 °C.




Structure


The anhydrous form consists of octahedral Co(ClO4)6 centers, with tridentate perchlorate ligands. On the other hand, the orthorhombic hexahydrate consists of isolated [Co(H2O)6]2+ octahedrons and perchlorate anions with lattice constants a = 7.76 Å, b = 13.44 Å and c = 5.20 Å. The hexahydrate undergoes phase transitions at low temperatures.




References

Kata Kunci Pencarian:

• Kamus rumus kimia
• Fluorin
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• Cobalt(II) perchlorate
• Manganese(II) perchlorate
• Iron(II) perchlorate
• Solubility chart
• Transition metal perchlorate complexes
• Nickel(II) perchlorate
• Solubility table
• List of CAS numbers by chemical compound
• List of desiccants
• Glossary of chemical formulae