Nickel(II) iodide

Nickel(II) iodide
	Hexahydrate
Names
	IUPAC name Nickel(II) iodide
	Other names Nickelous iodide
Identifiers
CAS Number	13462-90-3 ;
3D model (JSmol)	Interactive image; hexahydrate: Interactive image;
ChemSpider	24252; hexahydrate: 32816205;
ECHA InfoCard	100.033.319
EC Number	236-666-6;
PubChem CID	26038; hexahydrate: 138962054;
UNII	AQ9OJ30HDD ;
CompTox Dashboard (EPA)	DTXSID1065479 ;
	InChI Key: BFSQJYRFLQUZKX-UHFFFAOYSA-L; InChI=1S/2HI.Ni/h21H;/q;;+2/p-2; hexahydrate: InChI=1S/2HI.Ni.6H2O/h21H;;6*1H2/q;;+2;;;;;;/p-2 Key: IBSOYFJDSVROOT-UHFFFAOYSA-L;
	SMILES [Ni](I)I; hexahydrate: I[Ni]I.O.O.O.O.O.O;
Properties
Chemical formula	I2Ni
Molar mass	312.5023 g·mol−1
Appearance	iron-black solid (anhydrous) ; bluish-green solid (hexahydrate)
Density	5.384 g/cm3
Melting point	780 °C (1,440 °F; 1,050 K) (anhydrous) ; 43 °C (hexahydrate, loses water)
Solubility in water	124.2 g/100 mL (0 °C) ; 188.2 g/100 mL (100 °C)
Solubility	alcohols
Magnetic susceptibility (χ)	+3875.0·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)	2 0 0
Related compounds
Other anions	nickel(II) chloride, nickel(II) bromide, nickel(II) fluoride
Other cations	cobalt iodide, copper iodide,
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Nickel(II) iodide is an inorganic compound with the formula NiI₂. This paramagnetic black solid dissolves readily in water to give bluish-green solutions, from which crystallizes the aquo complex [Ni(H₂O)₆]I₂ (image above). This bluish-green colour is typical of hydrated nickel(II) compounds. Nickel iodides find some applications in homogeneous catalysis.