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Cobalt(II) perchlorate

Chemical compound From Wikipedia, the free encyclopedia

Cobalt(II) perchlorate
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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.

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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:[1]

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.[1][2]

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Structure

The anhydrous form consists of octahedral Co(ClO4)6 centers, with tridentate perchlorate ligands.[3] 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.[4][5]

References

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