Nickel formate

Nickel formate is the nickel salt of formic acid with the chemical formula Ni(HCOO)₂.

Nickel formate

Names
IUPAC name nickel(2+) diformate
Systematic IUPAC name nickel formate
Other names nickel diformate
Identifiers
CAS Number	3349-06-2[1] 15694-70-9 (Dihydrate) 15843-02-4
3D model (JSmol)	Interactive image
ChemSpider	25597 Y 35294216
ECHA InfoCard	100.020.093
EC Number	222-101-0, 239-946-6
PubChem CID	27506
UNII	Y4YT27N8QN
UN number	3077
CompTox Dashboard (EPA)	DTXSID40890523
InChI InChI=1S/2CH2O2.Ni/c2*2-1-3;/h2*1H,(H,2,3);/q;;+2/p-2 Key: HZPNKQREYVVATQ-UHFFFAOYSA-L
SMILES C(=O)[O-].C(=O)[O-].[Ni+2]
Properties
Chemical formula	C2H2NiO4
Molar mass	148.73[2]
Appearance	Green Solid[2][3]
Odor	odourless
Density	2.154 g/cm3[2]
Melting point	130–140°C[2]
Boiling point	180–200°C (decomposition)[2]
Solubility in water	Slightly soluble in cold water[2]
Solubility	insoluble in organic solvents[4] soluble in acids[3]
Structure
Crystal structure	monoclinic
Hazards
GHS labelling:[2]
Pictograms
Signal word	Danger
Hazard statements	H317, H334, H341, H350i, H360D, H372, H410
Precautionary statements	P260, P285, P302+P352, P321, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis and structure

Nickel formate can be obtained by reacting nickel(II) acetate or nickel(II) hydroxide^[3] with formic acid.^[5]

Ni(OH)₂ + 2HCOOH → Ni(HCOO)₂ + 2 H₂O

Nickel formate can also be synthesized by the reaction of sodium formate with nickel (II) sulphate.^[3]

Characteristics

As a dihydrate, nickel formate is a green, odorless, non-flammable solid that is sparingly soluble in water.^[2] The compound has a monoclinic crystal structure.^[3] The anhydride forms on careful heating at 130–140 °C.^[6] When heated in a vacuum to 300 °C, pure nickel is formed:^[5]

Ni(HCO₂)₂(H₂O)₂ → Ni + 2 CO₂ + 2 H₂O + H₂

Such fine powders are useful as hydrogenation catalysts.^[7]

Use

Nickel formate is used in the production of nickel and other nickel compounds such as nickel catalysts.^[4]