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Samarium(II) chloride

Samarium(II) chloride (SmCl<sub>2</sub>) 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&nbsp;°C to 900&nbsp;°C, or with hydrogen gas at 350&nbsp;°C yields samarium(II) chloride:

2 SmCl<sub>3</sub> + Sm → 3 SmCl<sub>2</sub>
2 SmCl<sub>3</sub> + H<sub>2</sub> → 2 SmCl<sub>2</sub> + 2 HCl

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

SmCl<sub>3</sub> + Li → SmCl<sub>2</sub> + LiCl

A similar reaction has been observed with sodium.

Structure

Samarium(II) chloride adopts the PbCl<sub>2</sub> (cotunnite) structure.

Physical properties

The compound co-crystallises with fermium dichloride ().

References