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]
 Sample of nickel(II) thiocyanate
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 Crystal structure of nickel(II) thiocyanate
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| Identifiers | |
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.808 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| 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: | |
  
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| 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
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Nickel(II) bromide, Nickel(II) chloride, Nickel(II) iodide |
Other cations
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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).
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Structure
editThe 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
editNickel(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
editNickel(II) thiocyanate, like nickel(II) iodide, nickel(II) bromide and nickel(II) chloride, is an antiferromagnet at low temperatures.[2]
References
edit- ^ 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.
- ^ 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.