Cobalt(II) acetate

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Cobalt(II) acetate
Names
IUPAC name
Cobalt(II) acetate
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.000.687 Edit this at Wikidata
UNII
  • InChI=1S/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 checkY
    Key: QAHREYKOYSIQPH-UHFFFAOYSA-L checkY
  • InChI=1/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
    Key: QAHREYKOYSIQPH-NUQVWONBAX
  • ionic form: [Co+2].[O-]C(=O)C.[O-]C(=O)C
  • coordination form (anhydrate): O=C(C)O[Co]OC(C)=O
  • coordination form (tetrahydrate): O=C(C)O[Co-4]([O+H2])([O+H2])([O+H2])([O+H2])OC(C)=O
Properties
Co(C2H3O2)2
Molar mass 177.02124 g/mol (anhydrous)
249.08 g/mol (tetrahydrate)
Appearance Pink crystals (anhydrous)
intense red crystals (tetrahydrate)
Odor vinegar (tetrahydrate)
Density 1.705 g/cm3 (tetrahydrate)
Melting point 140 °C (284 °F; 413 K) (tetrahydrate)
Soluble
Solubility soluble in
pentyl acetate
(tetrahydrate)
+11,000·10−6 cm3/mol
1.542 (tetrahydrate)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Lethal dose or concentration (LD, LC):
503 mg/kg (oral, rat)
Safety data sheet (SDS) J.T. Baker MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Cobalt(II) acetate is the

tetrahydrate Co(CH3CO2)2·4 H2O, abbreviated Co(OAc)2·4 H2O. It is used as a catalyst
.

Synthesis and structure

Like many other

transition metal acetates
, cobalt(II) acetate forms by the reaction of cobalt oxide or hydroxide and acetic acid:

CoO + 2 CH3CO2H + 3 H2O → Co(CH3CO2)2·4 H2O

The tetrahydrate has been shown by

nickel acetate is isostructural.[2]

Various hydrates are known including Co(CH3CO2)2·H2O and [Co(CH3CO2)2]5·0.5 H2O.[3]

Reactions and uses

Cobalt acetate is a precursor to various oil drying agents, catalysts that allow paints and varnishes to harden.[4]

Anhydrous cobalt acetate is a widely used source of cobalt in the synthesis of materials,[5] catalyst,[6] and complexes.[7]

Safety

Cobalt salts are poisonous.[8]

References

  1. doi:10.1107/S1600536803019093
    .
  2. doi:10.1107/S0365110X5300171X
    .
  3. doi:10.1002/zaac.200900457
    .
  4. doi:10.1002/14356007.a07_281.pub2
  5. PMID 25362353
    .
  6. doi:10.1016/j.tet.2006.06.065
    .
  7. doi:10.1021/ed054p443
    .
  8. ^ MallBaker MSDS[permanent dead link]

External Links

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