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Cobalt(II) acetate

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Cobalt(II) acetate
Names
IUPAC name Cobalt(II) acetate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.000.687 Edit this at Wikidata
PubChem CID
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2Key: QAHREYKOYSIQPH-UHFFFAOYSA-L
  • InChI=1/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2Key: QAHREYKOYSIQPH-NUQVWONBAX
SMILES
  • ionic form: .C(=O)C.C(=O)C
  • coordination form (anhydrate): O=C(C)OOC(C)=O
  • coordination form (tetrahydrate): O=C(C)O()()()()OC(C)=O
Properties
Chemical formula 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/cm (tetrahydrate)
Melting point 140 °C (284 °F; 413 K) (tetrahydrate)
Solubility in water Soluble
Solubility soluble in alcohol, dilute acids, pentyl acetate (tetrahydrate)
Magnetic susceptibility (χ) +11,000·10 cm/mol
Refractive index (nD) 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):
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 , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

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.

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 X-ray crystallography to adopt an octahedral structure, the central cobalt centre being coordinated by four water molecules and two acetate ligands. The analogous nickel acetate is isostructural.

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

Reactions and uses

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

Anhydrous cobalt acetate is a widely used source of cobalt in the synthesis of materials, catalyst, and complexes.

Oxidation of acetic acid solutions of cobalt(II) acetate, e.g. with ozone, gives cobalt(III) acetates, which are strong oxidants.

Safety

Cobalt salts are poisonous.

References

  1. Sobolev, Alexandre N.; Miminoshvili, Elguja B.; Miminoshvili, Ketevan E.; Sakvarelidze, Tamara N. (2003). "Cobalt diacetate tetrahydrate". Acta Crystallographica Section E. 59 (10): m836 – m837. doi:10.1107/S1600536803019093.
  2. Van Niekerk, J. N.; Schoening, F. R. L. (1953). "The crystal structures of nickel acetate, Ni(CH3COO)2·4H2O, and cobalt acetate, Co(CH3COO)2·4H2O". Acta Crystallogr. 6 (7): 609–612. doi:10.1107/S0365110X5300171X.
  3. Zhang, Gao; Lin, Jian; Guo, Dong-Wei; Yao, Shi-Yan; Tian, Yun-Qi (2010). "Infinite Coordination Polymers of One- and Two-dimensional Cobalt Acetates". Zeitschrift für Anorganische und Allgemeine Chemie. 636 (7): 1401–1404. doi:10.1002/zaac.200900457.
  4. John Dallas Donaldson, Detmar Beyersmann, "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a07_281.pub2
  5. Rodenas, Tania; Luz, Ignacio; Prieto, Gonzalo; Seoane, Beatriz; Miro, Hozanna; Corma, Avelino; Kapteijn, Freek; Llabrés i Xamena, Francesc X.; Gascon, Jorge (2015). "Metal–organic framework nanosheets in polymer composite materials for gas separation". Nature Materials. 14 (1): 48–55. Bibcode:2015NatMa..14...48R. doi:10.1038/nmat4113. PMC 4270742. PMID 25362353.
  6. Schultz, Mitchell J.; Sigman, Matthew S. (2006). "Recent advances in homogeneous transition metal-catalyzed aerobic alcohol oxidations". Tetrahedron. 62 (35): 8227–8241. doi:10.1016/j.tet.2006.06.065.
  7. Appleton, T. G. (1977). "Oxygen Uptake by a Cobalt(II) Complex". J. Chem. Educ. 54 (7): 443. doi:10.1021/ed054p443.
  8. Periasamy, Mariappan; Radhakrishnan, Ukkiramapandian (2001). "Cobalt(III) Acetate". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rc188. ISBN 0-471-93623-5.
Cobalt compounds
Cobalt(I)
Cobalt(II)
Cobalt(0,III)
Cobalt(II,III)
Cobalt(III)
Cobalt(III,IV)
Cobalt(IV)
Cobalt(V)
Acetyl halides and salts of the acetate ion
AcOH He
LiOAc Be(OAc)2
Be4O(OAc)6 		B(OAc)3
B2O(OAc)4 		AcOAc
ROAc 		NH4OAc AcOOH FAc
FOAc 		Ne
NaOAc
NaH(OAc)2 		Mg(OAc)2 Al(OAc)3
ALSOL
Al(OAc)2OH
Al(OH)2OAc
Al2SO4(OAc)4 		Si P S ClAc
ClOAc 		Ar
KOAc Ca(OAc)2 Sc(OAc)3 Ti(OAc)4 VO(OAc)3 Cr(OAc)2
Cr(OAc)3 		Mn(OAc)2
Mn(OAc)3 		Fe(OAc)2
Fe(OAc)3 		Co(OAc)2 Ni(OAc)2 CuOAc
Cu(OAc)2 		Zn(OAc)2 Ga(OAc)3 Ge As(OAc)3 Se BrAc
BrOAc 		Kr
RbOAc Sr(OAc)2 Y(OAc)3 Zr(OAc)4 Nb Mo(OAc)2 Tc Ru2(OAc)4Cl
Ru(OAc)3 		Rh2(OAc)4 Pd(OAc)2 AgOAc Cd(OAc)2 In(OAc)3 Sn(OAc)2
Sn(OAc)4 		Sb(OAc)3 Te IAc
IOAc
I(OAc)3 		Xe
CsOAc Ba(OAc)2 * Lu(OAc)3 Hf Ta W Re Os Ir Pt(OAc)2 Au(OAc)3 Hg2(OAc)2
Hg(OAc)2 		TlOAc
Tl(OAc)3 		Pb(OAc)2
Pb(OAc)4 		Bi(OAc)3 Po At Rn
Fr Ra ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
* La(OAc)3 Ce(OAc)3 Pr(OAc)3 Nd(OAc)3 Pm Sm(OAc)3 Eu(OAc)3 Gd(OAc)3 Tb(OAc)3 Dy(OAc)3 Ho(OAc)3 Er(OAc)3 Tm(OAc)3 Yb(OAc)3
** Ac(OAc)3 Th(OAc)4 Pa UO2(OAc)2 Np Pu Am Cm Bk Cf Es Fm Md No
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