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Chemical compound From Wikipedia, the free encyclopedia
Cobalt(II) acetate is the cobalt salt of acetic acid. It is commonly found as the tetrahydrate Co(CH3CO2)2·4 H2O, abbreviated Co(OAc)2·4 H2O. It is used as a catalyst.
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Names | |
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IUPAC name
Cobalt(II) acetate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.000.687 |
PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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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 alcohol, dilute acids, pentyl acetate (tetrahydrate) |
+11,000·10−6 cm3/mol | |
Refractive index (nD) |
1.542 (tetrahydrate) |
Hazards | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
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).
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Like many other transition metal acetates, cobalt(II) acetate forms by the reaction of cobalt oxide or hydroxide and acetic acid:
The tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central cobalt centre being coordinated by four water molecules and two acetate ligands.[1] The analogous nickel acetate is isostructural.[2]
Various hydrates are known including Co(CH3CO2)2·H2O and [Co(CH3CO2)2]5·0.5 H2O.[3]
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]
Oxidation of acetic acid solutions of cobalt(II) acetate, e.g. with ozone, gives cobalt(III) acetates, which are strong oxidants.[8]
Cobalt salts are poisonous.[citation needed]
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