Nickel(II) thiocyanate

Nickel(II) thiocyanate is a coordination polymer with formula Ni(SCN)₂.^[1] It is a green-brown solid and its crystal structure was determined first in 1982.^[1]

Nickel(II) thiocyanate

Sample of nickel(II) thiocyanate
Crystal structure of nickel(II) thiocyanate
Identifiers
CAS Number	13689-92-4
3D model (JSmol)	Interactive image
ChemSpider	4318849
ECHA InfoCard	100.033.808
EC Number	237-205-1
PubChem CID	5145251
CompTox Dashboard (EPA)	DTXSID30929573
InChI InChI=1S/2CHNS.Ni/c2*2-1-3;/h2*3H;/q;;+2/p-2 Key: ALYMILAYQDOMFU-UHFFFAOYSA-L
SMILES C(#N)[S-].C(#N)[S-].[Ni+2]
Properties
Chemical formula	Ni(SCN)2
Molar mass	174.86 g/mol[1]
Appearance	green-brown powder
Density	2.59 g/cm3[1]
Melting point	decomposes[1]
Magnetic susceptibility (χ)	5×10−3 cm3/mol[2]
Structure
Crystal structure	Hg(SCN)2 structure
Coordination geometry	Octahedral
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H317, H334, H341, H350i, H360D, H372, H410
Precautionary statements	P201, P202, P260, P261, P264, P270, P272, P273, P280, P281, P285, P302+P352, P304+P341, P308+P313, P314, P321, P333+P313, P342+P311, P363, P391, P405, P501
Related compounds
Other anions	Nickel(II) bromide, Nickel(II) chloride, Nickel(II) iodide
Other cations	Copper(I) thiocyanate, Cobalt(II) thiocyanate, Mercury(II) thiocyanate, Ammonium thiocyanate Potassium thiocyanate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Structure

The structure of Ni(SCN)₂ was determined via single-crystal X-ray diffraction and consists of two-dimensional sheets held together through Van der Waals forces. It belongs to mercury thiocyanate structure-type and can be considered a distorted form of the NiBr₂ (CdI₂) structure. Each nickel is octahedrally coordinated by four sulfurs and two nitrogens. The sulfur end of the SCN⁻ ligand is doubly bridging.^[1]

Synthesis

Nickel(II) thiocyanate can be prepared via the reaction of barium thiocyanate and nickel sulfate solutions. After removal of the precipitated barium sulfate]], the solution is allowed to evaporate leaving microcrystalline Ni(SCN)₂.^[3][4]

Magnetism

Nickel(II) thiocyanate, like nickel(II) iodide, nickel(II) bromide and nickel(II) chloride, is an antiferromagnet at low temperatures.^[2]