Dysprosium(II) iodide

Dysprosium(II) iodide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.151.507 Edit this at Wikidata
EC Number
  • 622-765-5
  • InChI=1S/Dy.2HI/h;2*1H/p-2
    Key: SSDFPWIJYIKUFK-UHFFFAOYSA-L
  • [I-].[I-].[Dy+2]
Properties
DyI2
Molar mass 416.309 g·mol−1
Appearance dark purple-black solid[1]
Melting point 659 °C[1]
Hazards
GHS labelling:[2]
GHS07: Exclamation mark
Warning
H315, H319, H335
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).

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

  1. ^ a b c d e Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
  2. ^ "Dysprosium(II) iodide". pubchem.ncbi.nlm.nih.gov.
  3. ^ 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)
  4. ^ Sigma-Aldrich Co., product no. 652423.
  5. ^ 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.

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