Nickel(II) thiocyanate

Sample of nickel(II) thiocyanate

Crystal structure of nickel(II) thiocyanate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.808 Edit this at Wikidata
EC Number
  • 237-205-1
  • InChI=1S/2CHNS.Ni/c2*2-1-3;/h2*3H;/q;;+2/p-2
    Key: ALYMILAYQDOMFU-UHFFFAOYSA-L
  • C(#N)[S-].C(#N)[S-].[Ni+2]
Properties
Ni(SCN)2
Molar mass 174.86 g/mol[1]
Appearance green-brown powder
Density 2.59 g/cm3[1]
Melting point decomposes[1]
5×10−3 cm3/mol[2]
Structure
Hg(SCN)2 structure
Octahedral
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard
Danger
H317, H334, H341, H350i, H360D, H372, H410
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).

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]

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 salt metathesis using the reaction of methanolic solutions of KSCN and nickel(II) perchlorate hexahydrate, filtering off the precipitated KClO4 to yield a solution of Ni(SCN)2. On removal of the methanol, a pure microcrystalline powder of Ni(SCN)2 can be obtained.

Magnetism

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

References

  1. ^ a b c d e f Dubler, Erich; Relier, Armin; Oswald, H. R. (1982-01-01). "Intermediates in thermal decomposition of nickel(II) complexes: The crystal structures of Ni(SCN)2(NH3)2 and Ni(SCN)2". Zeitschrift für Kristallographie – Crystalline Materials. 161 (1–4): 265–278. doi:10.1524/zkri.1982.161.14.265. ISSN 2196-7105. S2CID 201671776.
  2. ^ a b DeFotis, G. C.; Dell, K. D.; Krovich, D. J.; Brubaker, W. W. (1993-05-15). "Antiferromagnetism of Ni(SCN)2". Journal of Applied Physics. 73 (10): 5386–5388. Bibcode:1993JAP....73.5386D. doi:10.1063/1.353740. ISSN 0021-8979.
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