Samarium(II) chloride

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Samarium(II) chloride
Samarium(I) chloride Cotunnite structure.png
Samarium(I) chloride
Anode precipitate of SmCl2.jpg
Names
IUPAC name
Samarium(I) chloride
Other names
Samarium dichloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.196 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 237-631-8
PubChem CID
  • InChI=1S/2ClH.Sm/h2*1H;/q;;+2/p-2 Yes check.svgY
    Key: VPRJMFJPKMESHB-UHFFFAOYSA-L Yes check.svgY
  • InChI=1/2ClH.Sm/h2*1H;/q;;+2/p-2
    Key: VPRJMFJPKMESHB-NUQVWONBAS
  • Cl[Sm]Cl
Properties
SmCl2
Molar mass 221.27 g/mol
Appearancedark 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)
 ?
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).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

Samarium(II) chloride (Sm Cl2) is a chemical compound, used as a radical generating agent in the ketone-mediated intraannulation reaction.

Contents

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. 1 2 Brauer, Georg; Baudler, Marianne (1975). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. ISBN   3-432-02328-6.
  2. 1 2 3 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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