Samarium(II) chloride

Samarium(II) chloride
Names
	IUPAC name Samarium(II) chloride
	Other names Samarium dichloride
Identifiers
CAS Number	13874-75-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	4908199 ;
ECHA InfoCard	100.034.196
EC Number	237-631-8;
PubChem CID	6393953;
CompTox Dashboard (EPA)	DTXSID30930205 ;
	InChI InChI=1S/2ClH.Sm/h21H;/q;;+2/p-2 Key: VPRJMFJPKMESHB-UHFFFAOYSA-L ; InChI=1/2ClH.Sm/h21H;/q;;+2/p-2 Key: VPRJMFJPKMESHB-NUQVWONBAS;
	SMILES Cl[Sm]Cl;
Properties
Chemical formula	SmCl2
Molar mass	221.27 g/mol
Appearance	dark brown crystals
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)
Solubility in water	?
Structure
Crystal structure	Orthorhombic
Space group	Pbnm, No. 62
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). verify (what is ?) Infobox references

Samarium(II) chloride (Sm Cl₂) 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

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

[Less_Common-2] 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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