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 HClSamarium(II) chloride can also be prepared by reducing samarium(III) chloride with lithium metal/naphthalene in THF:2
SmCl3 + Li → SmCl2 + LiClA similar reaction has been observed with sodium.3
Structure
Samarium(II) chloride adopts the PbCl2 (cotunnite) structure.4
Physical properties
The compound co-crystallises with fermium dichloride (FmCl2).5
References
Brauer, Georg; Baudler, Marianne (1975). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. ISBN 3-432-02328-6. 3-432-02328-6 ↩
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. /wiki/Doi_(identifier) ↩
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. /wiki/Doi_(identifier) ↩
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. /wiki/Doi_(identifier) ↩
Бекман, Игорь (2 November 2020). Неорганическая химия. Радиоактивные элементы 2-е изд., испр. и доп. Учебник для СПО (in Russian). Litres. p. 365. ISBN 978-5-04-309059-1. Retrieved 27 March 2025. 978-5-04-309059-1 ↩