Dysprosium(II) iodide

Dysprosium(II) iodide
Identifiers
CAS Number	36377-94-3;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.151.507
EC Number	622-765-5;
PubChem CID	71431174;
CompTox Dashboard (EPA)	DTXSID20849397 ;
	InChI InChI=1S/Dy.2HI/h;2*1H/p-2 Key: SSDFPWIJYIKUFK-UHFFFAOYSA-L;
	SMILES [I-].[I-].[Dy+2];
Properties
Chemical formula	DyI2
Molar mass	416.309 g·mol−1
Appearance	dark purple-black solid
Melting point	659 °C
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
Related compounds
Other anions	dysprosium(II) chloride; dysprosium(II) bromide
Related compounds	dysprosium(III) iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dysprosium(II) iodide is an iodide of dysprosium with the chemical formula DyI₂.

Preparation

Dysprosium(II) iodide can be produced by reducing dysprosium(III) iodide with metallic dysprosium under a vacuum at 800 to 900 °C:^[1]

Dy + 2 DyI₃ → 3 DyI₂

It can also be formed by the reaction of dysprosium and mercury(II) iodide:^[1]

Dy + HgI₂ → DyI₂ + Hg

It can also be formed by the direct reaction of dysprosium and iodine.^[3]

Dy + I₂ → DyI₂

Properties

Dysprosium(II) iodide is a dark purple-black solid that is easily deliquescent and can only be stored in a dry inert gas or a vacuum. In the air, it will absorb moisture and become a hydrate, but they are unstable and will quickly convert into iodide oxides and release hydrogen gas. This process occurs faster in the presence of water. This compound has the same crystal structure as cadmium chloride.^[1] It can form complexes with tetrahydrofuran, butanol and phenol.^[3]

Uses

The reaction between dysprosium(II) iodide and silicon tetrachloride produces trichlorosilyl radicals, which can catalyze the trimerization of alkynes.^[4]^[5]

References

^ ^a ^b ^c ^d ^e Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
^ "Dysprosium(II) iodide". pubchem.ncbi.nlm.nih.gov.
^ ^a ^b Karl A. Jr. Gschneidner, Jean-Claude Bunzli, Vitalij K. Pecharsky (2009). Handbook on the Physics and Chemistry of Rare Earths. Elsevier. p. 247. ISBN 978-008093257-6.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ Sigma-Aldrich Co., product no. 652423.
^ Zhu, Zhenyu; Wang, Chuanfeng; Xiang, Xu; Pi, Chengfu; Zhou, Xigeng (2006). "DyI2 initiated mild and highly selective silyl radical-catalyzed cyclotrimerization of terminal alkynes and polymerization of MMA". Chemical Communications (19): 2066–2068. doi:10.1039/b602883g. ISSN 1359-7345. PMID 16767277.