Cobalt(II) perchlorate

Source: Wikipedia, the free encyclopedia.
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
  • [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Co+2]
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).

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:[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]

Structure

The anhydrous form consists of octahedral Co(ClO4)6 centers, with tridentate perchlorate ligands.

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

  1. ^
    doi:10.1007/bf01909967
    .
  2. doi:10.1039/DT9850000297
    .
  3. doi:10.1021/ic00196a026
    .
  4. doi:10.1016/0009-2614(83)80311-X
    .
  5. doi:10.1088/0022-3719/8/12/013
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Cobalt(II)_perchlorate&oldid=1217835414"