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Nickel(II) acetate

Chemical compound From Wikipedia, the free encyclopedia

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.

Quick facts Names, Identifiers ...
Nickel(II) acetate
Names
Systematic IUPAC name
Nickel(2+) diacetate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.006.147 Edit this at Wikidata
EC Number
  • 239-086-1
UNII
UN number 2811
  • Key: AIYYMMQIMJOTBM-UHFFFAOYSA-L
  • InChI=1S/2C2H4O2.Ni/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
  • (tetrahydrate): InChI=1S/2C2H4O2.Ni.4H2O/c2*1-2(3)4;;;;;/h2*1H3,(H,3,4);;4*1H2/q;;+2;;;;/p-2
    Key: OINIXPNQKAZCRL-UHFFFAOYSA-L
  • ionic form: [Ni+2].[O-]C(=O)C.[O-]C(=O)C
  • (tetrahydrate): CC(=O)[O-].CC(=O)[O-].O.O.O.O.[Ni+2]
  • coordination form (anhydrate): O=C(C)O[Ni]OC(C)=O
Properties
C4H6NiO4
Molar mass 176.781 g·mol−1
Appearance Mint-green Solid
Odor slight acetic acid
Density 1.798 g/cm3 (anhydrous)
1.744 g/cm3 (tetrahydrate)
Melting point decomposes when heated [1][2]
Easily soluble in cold water, hot water
Solubility Soluble in methanol
insoluble in diethyl ether, n-octanol
+4,690.0·10−6 cm3/mol
Structure
monoclinic
P21/c
a = 4.764, b = 11.771, c = 8.425 Å
α = 90°, β = 93.6°, γ = 90°[3]
tetrahydrate
471.5
2
distorted octahedral
Hazards
GHS labelling:
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GHS07: Exclamation mark
‹ The template below (GHS health hazard) is being considered for merging with GHS pictogram. See templates for discussion to help reach a consensus. ›
GHS08: Health hazard
‹ The template below (GHS environment) is being considered for merging with GHS pictogram. See templates for discussion to help reach a consensus. ›
GHS09: Environmental hazard
Danger
H302, H317, H332, H334, H341, H350, H360, H372, H410
P203, P233, P260, P264, P270, P271, P272, P273, P280, P284, P301+P317, P302+P352, P304+P340, P317, P318, P319, P321, P330, P333+P317, P342+P316, P362+P364, P391, P403, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 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
2
0
0
Lethal dose or concentration (LD, LC):
350 mg/kg (rat, oral)
410 mg/kg (mouse, oral)[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[5] It may be dehydrated in vacuo, by reaction with acetic anhydride[6] or by heat.[7]

Safety

Nickel salts are toxic, carcinogenic and irritate the skin.

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