Dysprosium(III) iodide

Dysprosium(III) iodide is a binary inorganic compound of dysprosium and iodine with the chemical formula DyI
₃.^[1]

Dysprosium(III) iodide

Names
Other names Dysprosium triiodide, triiododysprosium
Identifiers
CAS Number	15474-63-2
3D model (JSmol)	Interactive image
ChemSpider	76618
ECHA InfoCard	100.035.888
EC Number	239-493-4
PubChem CID	519122
CompTox Dashboard (EPA)	50935055
InChI InChI=1S/Dy.3HI/h;3*1H/q+3;;;/p-3 Key: RZQFCZYXPRKMTP-UHFFFAOYSA-K
SMILES I[Dy](I)I
Properties
Chemical formula	DyI3
Molar mass	543.213 g·mol−1
Appearance	yellow-green flaky solid
Density	g/cm3
Melting point	955 °C (1,751 °F; 1,228 K)
Boiling point	1,320 °C (2,410 °F; 1,590 K)
Solubility in water	soluble
Structure
Crystal structure	trigonal
Related compounds
Related compounds	Ytterbium(III) iodide
Hazards
GHS labelling:
Pictograms
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Dysprosium(III) iodide can be obtained by reacting dysprosium with iodine.

2Dy + 3I → 2DyI₃

Dysprosium(III) iodide can be obtained using the effect of mercury diiodide on dysprosium filings:

2Dy + 3HgI₂ → 2DyI₃ + 3Hg

Physical properties

Dysprosium(III) iodide is a hygroscopic yellow-green flaky solid^[2] that is soluble in water.^[3] The compound has a trigonal crystal structure of the bismuth(III) iodide type with the space group R3.

Uses

Dysprosium(III) iodide is used in gas discharge lamps to generate white light.^[4]

References

1. "dysprosium triiodide". NIST. Retrieved 5 April 2023.
2. Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3117. ISBN 978-0-412-30120-9. Retrieved 5 April 2023.
3. "Dysprosium(III) iodide, ultra dry, 99.99% (REO), Thermo Scientific Chemicals". fishersci.com. Retrieved 5 April 2023.
4. Emsley, John (2003). Nature's Building Blocks: An A-Z Guide to the Elements. Oxford University Press. p. 131. ISBN 978-0-19-850340-8. Retrieved 5 April 2023.