Samarium(III) iodide

Samarium(III) iodide
Names
	Other names Triiodosamarium, Samarium triiodide
Identifiers
CAS Number	13813-25-7 ; 75179-64-5 (nonahydrate) ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.034.048
EC Number	237-468-2;
PubChem CID	83746;
CompTox Dashboard (EPA)	DTXSID5065643 ;
	InChI InChI=1S/3HI.Sm/h3*1H;/q;;;+3/p-3 Key: XQKBFQXWZCFNFF-UHFFFAOYSA-K;
	SMILES I[Sm](I)I;
Properties
Chemical formula	SmI; 3
Molar mass	531.1
Appearance	orange-yellow crystals
Melting point	850 °C (1,560 °F; 1,120 K)
Solubility in water	decomposes in water
Hazards
	GHS labelling:
Signal word	Danger
Related compounds
Related compounds	Samarium(II) iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Samarium(III) iodide is an inorganic compound, a salt of samarium and hydroiodic acid with the chemical formula SmI
₃.^[1]^[2]

Synthesis

Samarium(III) iodide is prepared by the reaction of metallic samarium and iodine:^[3]

2 Sm + 3 I₂ → 2 SmI₃

Properties

Samarium(III) iodide is a yellow powder that is unstable in air and decomposes in water (hydrolysis).^[1] When heated with metallic samarium, it forms samarium diiodide:^[4]

2SmI₃ + Sm → 3 SmI₂

Reduction by hydrogen also affords samarium diiodide upon heating:

2 SmI₃ + H₂ → 2 SmI₂ + 2 HI

Applications

The compound is commercially available and used in organic reactions as a catalyst.^[1]

References

^ ^a ^b ^c Zhang, Yuanmin (6 November 2011). "Samarium Triiodide". Synlett. 2011 (11): 1638–1639. doi:10.1055/s-0030-1260781.
^ "Samarium(III) Iodide". American Elements. American Elements. Retrieved 8 August 2021.
^ Molodkin, A. K.; Karagodina, A. M.; Tupolev, V. S.; Dudareva, A. G.; Prokhina, A. G. (1984). "Iodination of samarium and reaction of samarium triiodide with lithium iodide". Zhurnal Neorganicheskoj Khimii (in Russian). 29 (4): 1069–1072. ISSN 0044-457X. Retrieved 8 August 2021.
^ Imamoto, Tsuneo; Ono, Mitsumasa (5 March 1987). "The Reaction of Samarium(III) Iodide with Samarium Metal in Tetrahydrofuran, A New Method for the Preparation of Samarium(II) Iodide". Chemistry Letters. 16 (3): 501–502. doi:10.1246/cl.1987.501. ISSN 0366-7022.

[SL-1] Zhang, Yuanmin (6 November 2011). "Samarium Triiodide". Synlett. 2011 (11): 1638–1639. doi:10.1055/s-0030-1260781.

[2] "Samarium(III) Iodide". American Elements. American Elements. Retrieved 8 August 2021.

[3] Molodkin, A. K.; Karagodina, A. M.; Tupolev, V. S.; Dudareva, A. G.; Prokhina, A. G. (1984). "Iodination of samarium and reaction of samarium triiodide with lithium iodide". Zhurnal Neorganicheskoj Khimii (in Russian). 29 (4): 1069–1072. ISSN 0044-457X. Retrieved 8 August 2021.

[4] Imamoto, Tsuneo; Ono, Mitsumasa (5 March 1987). "The Reaction of Samarium(III) Iodide with Samarium Metal in Tetrahydrofuran, A New Method for the Preparation of Samarium(II) Iodide". Chemistry Letters. 16 (3): 501–502. doi:10.1246/cl.1987.501. ISSN 0366-7022.

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