Samarium(II) chloride

Samarium(II) chloride
Samarium(II) chloride
Names
IUPAC name
Samarium(II) chloride
Other names
Samarium dichloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.196 Edit this at Wikidata
EC Number
  • 237-631-8
  • InChI=1S/2ClH.Sm/h2*1H;/q;;+2/p-2 checkY
    Key: VPRJMFJPKMESHB-UHFFFAOYSA-L checkY
  • InChI=1/2ClH.Sm/h2*1H;/q;;+2/p-2
    Key: VPRJMFJPKMESHB-NUQVWONBAS
  • Cl[Sm]Cl
Properties
SmCl2
Molar mass 221.27 g/mol
Appearance dark brown crystals[1]
Density 3.69 g/cm3, solid
Melting point 855 °C (1,571 °F; 1,128 K)
Boiling point 1,310 °C (2,390 °F; 1,580 K)
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Structure
Orthorhombic
Pbnm, No. 62[2]
Related compounds
Other anions
 Samarium(II) bromide
Samarium(II) iodide
Other cations
 Samarium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Samarium(II) chloride (SmCl2) is a chemical compound, used as a radical generating agent in the ketone-mediated intraannulation reaction.

Preparation

Reduction of samarium(III) chloride with samarium metal in a vacuum at a temperature of 800 °C to 900 °C, or with hydrogen gas at 350 °C yields samarium(II) chloride:[1]

2 SmCl3 + Sm → 3 SmCl2
2 SmCl3 + H2 → 2 SmCl2 + 2 HCl

Samarium(II) chloride can also be prepared by reducing samarium(III) chloride with lithium metal/naphthalene in THF:[3]

SmCl3 + Li → SmCl2 + LiCl

A similar reaction has been observed with sodium.[2]

Structure

Samarium(II) chloride adopts the PbCl2 (cotunnite) structure.[2]

References

  1. ^ a b Brauer, Georg; Baudler, Marianne (1975). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. ISBN 3-432-02328-6.
  2. ^ a b c Meyer, Gerd; Schleid, Thomas (1986-02-01). "The metallothermic reduction of several rare-earth trichlorides with lithium and sodium". Journal of the Less Common Metals. 116 (1): 187–197. doi:10.1016/0022-5088(86)90228-6.
  3. ^ Rossmainth, Kurt (1979-01-01). "Herstellung der klassischen Seltenerd(II)-chloride in Lösung" [Preparation of the classical rare earth(II) chlorides in solution]. Anorganische, Struktur- und Physikalische Chemie. 110 (4): 109–114. doi:10.1007/BF00903752. S2CID 91731356.


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