Cobalt(II) acetate

Cobalt(II) acetate

Cobalt(II) acetate
Names
IUPAC name Cobalt(II) acetate
Identifiers
CAS Number	71-48-7 (anhydrous) Y 6147-53-1 (tetrahydrate) N
ChemSpider	6041 Y
Jmol 3D model	Interactive image
PubChem	6277
UNII	3XC4P44U7E Y
InChI InChI=1S/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Y Key: QAHREYKOYSIQPH-UHFFFAOYSA-L Y InChI=1/2C2H4O2.Co/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Key: QAHREYKOYSIQPH-NUQVWONBAX
SMILES [Co+2].[O-]C(=O)C.[O-]C(=O)C
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/cm3 (tetrahydrate)
Melting point	140 °C (284 °F; 413 K) (tetrahydrate)
Solubility in water	Soluble
Solubility	soluble in alcohol, dilute acids, pentyl acetate (tetrahydrate)
Refractive index (nD)	1.542 (tetrahydrate)
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Cobalt(II) acetate is the cobalt(II) salt of acetic acid. It is commonly found as the tetrahydrate Co(C₂H₃O₂)₂·4 H₂O or Co(CH₃COO)₂·4 H₂O also abbreviated Co(OAc)₂·4 H₂O. It is used as an industrial catalyst.

Synthesis and structure

It may be formed by the reaction between cobalt oxide or hydroxide and acetic acid:

CoO + 2 HC₂H₃O₂ + 3 H₂O → Co(C₂H₃O₂)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.

Reactions and uses

Cobalt acetate is a precursor to various oil drying agents, catalysts that allow paints and varnishes to harden. Cobalt(II) acetate reacts with salenH₂ to give salcomine, a transition metal dioxygen complex:

Co(OAc)₂ + salenH₂ → Co(salen) + 2 HOAc

Safety

Cobalt salts are poisonous.

References

Salts and the ester of the Acetate ion
AcOH																	He
LiOAc	Be(OAc)2 BeAcOH											B(OAc)3	ROAc	NH4OAc	AcOAc	FAc	Ne
NaOAc	Mg(OAc)2											Al(OAc)3 ALSOL Al(OAc)2OH	Si	P	S	ClAc	Ar
KOAc	Ca(OAc)2	Sc(OAc)3	Ti(OAc)4	VO(OAc)3	Cr(OAc)2	Mn(OAc)2 MnAc3	Fe(OAc)2 FeAc3	Co(OAc)2, CoAc3	Ni(OAc)2	Cu(OAc)2	Zn(OAc)2	Ga(OAc)3	Ge	As	Se	BrAc	Kr
RbOAc	Sr(OAc)2	Y(OAc)3	Zr(OAc)4	Nb	Mo(OAc)2	Tc	Ru(OAc)2 Ru(OAc)3 Ru(OAc)4	Rh2(OAc)4	Pd(OAc)2	AgOAc	Cd(OAc)2	In	Sn(OAc)2 SnAc4	Sb(OAc)3	Te	IAc	Xe
CsOAc	Ba(OAc)2		Hf	Ta	W	Re	Os	Ir	Pt(OAc)2	Au	Hg2(OAc)2, HgAc2	TlOAc Tl(OAc)3	Pb(OAc)2 Pb(OAc)4	Bi(OAc)3	Po	At	Rn
Fr	Ra		Rf	Db	Sg	Bh	Hs	Mt	Ds	Rg	Cn	Uut	Fl	Uup	Lv	Uus	Uuo
		↓
		La(OAc)3	Ce(OAc)x	Pr	Nd	Pm	Sm(OAc)3	Eu(OAc)3	Gd(OAc)3	Tb	Dy(OAc)3	Ho(OAc)3	Er	Tm	Yb(OAc)3	Lu(OAc)3
		Ac	Th	Pa	UO2(OAc)2	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr