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Strontium thiocyanate

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Water-soluble salt
Strontium thiocyanate
Sr [N≡C−S]2
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/2CHNS.Sr/c2*2-1-3;/h2*3H;/q;;+2/p-2Key: YNQRWDDCTKWYJP-UHFFFAOYSA-L
SMILES
  • C(#N).C(#N).
Properties
Chemical formula C2N2S2Sr
Molar mass 203.78 g·mol
Appearance white solid
Melting point 331–379 °C (decomposes at 650 °C)
Structure
Crystal structure Monoclinic
Space group C2/c
Point group 2/m
Lattice constant a = 9.86 Å, b = 6.63 Å, c = 8.20 Åα = 90°, β = 91.3°, γ = 90°
Formula units (Z) 4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Strontium thiocyanate refers to the salt Sr(SCN)2. It is a colorless solid. According to X-ray crystallography, it is a coordination polymer. The Sr ions are each coordinated to eight thiocyanate anions in a distorted square antiprismatic molecular geometry where each square face contains two adjacent S atoms and two adjacent N atoms. The motif is reminiscent of the fluorite structure. The same structure is observed for Ca(SCN)2, Ba(SCN)2, and Pb(SCN)2.

Solid Sr(SCN)2 has a complicated polymeric structure as is revealed by this image of a fragment of the lattice. Color code: Sr = turquoise, N = blue, C = gray, S = orange.

References

  1. ^ Mokuolu, J. A. A.; Speakman, J. C. (1975). "The crystal structure of lead(II) thiocyanate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 31: 172–176. doi:10.1107/S0567740875002300.
  2. ^ Wickleder, Claudia (July 2001). "M(SCN)2 (M = Eu, Sr, Ba): Kristallstruktur, thermisches Verhalten, Schwingungsspektroskopie" [M(SCN)2 (M = Eu, Sr, Ba): Crystal structure, thermal behavior, vibrational spectroscopy]. Zeitschrift für anorganische und allgemeine Chemie (in German). 627 (7): 1693–1698. doi:10.1002/1521-3749(200107)627:7<1693::AID-ZAAC1693>3.0.CO;2-U.
  3. Cliffe, Matthew J. (2024). "Inorganic Metal Thiocyanates". Inorganic Chemistry. 63 (29): 13137–13156. doi:10.1021/acs.inorgchem.4c00920. PMC 11271006. PMID 38980309.
Strontium compounds
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