Cobalt(II) perchlorate

Chemical compound From Wikipedia, the free encyclopedia

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.

Quick facts Names, Identifiers ...
Cobalt(II) perchlorate
Hexahydrate
Names
Systematic IUPAC name
Cobalt(II) diperchlorate
Other names
  • Cobaltous perchlorate
  • Cobalt diperchlorate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.307 Edit this at Wikidata
EC Number
  • 236-653-5
  • InChI=1S/2ClHO4.Co/c2*2-1(3,4)5;/h2*(H,2,3,4,5);/q;;+2/p-2
    Key: BSUSEPIPTZNHMN-UHFFFAOYSA-L
  • hexahydrate: InChI=1S/2ClHO4.Co.6H2O/c2*2-1(3,4)5;;;;;;;/h2*(H,2,3,4,5);;6*1H2/q;;+2;;;;;;/p-2
    Key: KPOBHNYTWJSVKF-UHFFFAOYSA-
  • [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Co+2]
  • hexahydrate: [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Co+2].O.O.O.O.O.O
Properties
Co(ClO4)2
Molar mass 257.83 g/mol
Appearance Pink solid (anhydrous)
Dark-red crystals (hexahydrate)
Density 3.33 g/cm3
Melting point 170 °C (338 °F; 443 K)[1] (decomposition, hexahydrate)
113 g/100 mL (25 °C)
Solubility Insoluble in ethanol and acetone
Hazards
GHS labelling:
GHS03: OxidizingGHS07: Exclamation markGHS08: Health hazard
Danger
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
2
0
1
OX
Safety data sheet (SDS) Fisher SDS
Related compounds
Other cations
 Iron(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).
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Structure

The anhydrous form consists of octahedral Co(ClO4)6 centers, with tridentate perchlorate ligands.[2] 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.[3][4]

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][5]

References

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