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Nickel(II) acetate

Names
Systematic IUPAC name Nickel(2+) diacetate
Identifiers
CAS Number	373-02-4 6018-89-9 (tetrahydrate)
3D model (JSmol)	ionic form: Interactive image coordination form (anhydrate): Interactive image coordination form (tetrahydrate): Interactive image
ECHA InfoCard	100.006.147
EC Number	239-086-1
PubChem CID	9756
UNII	99QP4ELX96 6SOA8L0560 (tetrahydrate)
CompTox Dashboard (EPA)	DTXSID7020926
InChI InChI=1S/2C2H4O2.Ni/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
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	C4H6NiO4
Molar mass	176.781 g·mol
Appearance	Mint-green Solid
Odor	slight acetic acid
Density	1.798 g/cm (anhydrous) 1.744 g/cm (tetrahydrate)
Melting point	decomposes when heated
Solubility in water	Easily soluble in cold water, hot water
Solubility	Soluble in methanol insoluble in diethyl ether, n-octanol
Magnetic susceptibility (χ)	+4,690.0·10 cm/mol
Structure
Crystal structure	monoclinic
Space group	P21/c
Lattice constant	a = 4.764, b = 11.771, c = 8.425 Åα = 90°, β = 93.6°, γ = 90°tetrahydrate
Lattice volume (V)	471.5
Formula units (Z)	2
Coordination geometry	distorted octahedral
Hazards
NFPA 704 (fire diamond)	2 0 0
Lethal dose or concentration (LD, LC):
LD50 (median dose)	350 mg/kg (rat, oral) 410 mg/kg (mouse, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Nickel(II) acetate is the name for the coordination compounds with the formula Ni(CH₃CO₂)₂·x H₂O where x can be 0, 2, and 4. The mint-green tetrahydrate Ni(CH₃CO₂)₂·4 H₂O is most common. It is used for electroplating.

Synthesis and structure

The compound can be prepared by treating nickel or nickel(II) carbonate with acetic acid:

NiCO₃ + 2 CH₃CO₂H + 3 H₂O → Ni(CH₃CO₂)₂·4 H₂O + CO₂

The mint-green tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central nickel centre being coordinated by four water molecules and two acetate ligands. It may be dehydrated in vacuo, by reaction with acetic anhydride or by heat.

Safety

Nickel salts are toxic, carcinogenic and irritate the skin.

References

1. M. A. Mohamed, S. A. Halawy, M. M. Ebrahim: "Non-isothermal decomposition of nickel acetate tetrahydrate", in: Journal of Analytical and Applied Pyrolysis, 1993, 27 (2), S. 109–110. doi:10.1016/0165-2370(93)80002-H.
2. G. A. M. Hussein, A. K. H. Nohman, K. M. A. Attyia: "Characterization of the decomposition course of nickel acetate tetrahydrate in air", in: Journal of Thermal Analysis and Calorimetry, 1994, 42, S. 1155–1165; doi:10.1007/BF02546925.
3. Downie, T. C.; Harrison, W.; Raper, E. S.; Hepworth, M. A. (15 March 1971). "A three-dimensional study of the crystal structure of nickel acetate tetrahydrate". Acta Crystallographica Section B. 27 (3): 706–712. Bibcode:1971AcCrB..27..706D. doi:10.1107/S0567740871002802.
4. "Nickel metal and other compounds (as Ni)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
5. 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.
6. Lascelles, Keith; Morgan, Lindsay G.; Nicholls, David; Beyersmann, Detmar (2005). "Nickel Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a17_235.pub2. ISBN 978-3527306732.
7. Tappmeyer, W. P.; Davidson, Arthur W. (1963). "Cobalt and Nickel Acetates in Anhydrous Acetic Acid". Inorg. Chem. 2 (4): 823–825. doi:10.1021/ic50008a039.

• Nickel compounds
• Acetates