Dysprosium(II) chloride

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Dysprosium(II) chloride
IUPAC names
Dysprosium(II) chloride
Dysprosium dichloride
3D model (JSmol)
PubChem CID
  • InChI=1S/2ClH.Dy/h2*1H;/p-2
  • [Cl-].[Cl-].[Dy]
Molar mass 233.406 g/mol
Related compounds
Other cations
NdCl2, SmCl2, EuCl2, TmCl2, YbCl2
Related compounds
Dysprosium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Dysprosium(II) chloride (DyCl2), also known as dysprosium dichloride, is an ionic chemical compound of dysprosium and chlorine. This salt is a reduced compound, as the normal oxidation state of dysprosium in dysprosium compounds is +3.


Dysprosium dichloride is glossy black in appearance. The salt is damaged by oxidation on exposure to air. It is an electrical insulator. [2]

The structure is the same as for strontium bromide, ytterbium dichloride, and terbium dichloride. There are two forms. The low temperature form is below 652 °C. It is orthorhombic with unit cell dimensions a=6.69, b=6.76, and c=7.06 Å. [3]


Dysprosium dichloride can be prepared by heating molten dysprosium trichloride with dysprosium metal, and rapidly quenching. Molybdenum, niobium or tantalum crucibles are required to avoid alloy formation with the dysprosium. [4]


Dysprosium dichloride is capable of reducing titanium dichloride to titanium metal in a potassium chloride, sodium chloride flux. [5]

Ti2+ + 2Dy2+ Ti (solid) + 2Dy3+

A ternary dysprosium(II) chloride compound is known with lithium: LiDy2Cl5. This is produced by heating lithium metal and dysprosium trichloride together at 700 °C. This compound is also black. The crystal system of LiDy2Cl5 is monoclinic with space group C2/c 4 formulae per unit cell which has dimensions ; a = 16.45.6(; b = 6.692; and c = 7.267; with β = 95.79°. [6]

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  1. "Dysprosium dichloride". webbook.nist.gov.
  2. Macintyre, Jane E. (1992-07-23). Dictionary of Inorganic Compounds. CRC Press. p. 2867. ISBN   978-0-412-30120-9.
  3. Corbett, John D.; McCollum, Bill C. (May 1966). "Rare Earth Metal-Metal Halide Systems. IX. The Dysprosium-Dysprosium(III) Chloride System and the Preparation of Dysprosium(II) Chloride". Inorganic Chemistry. 5 (5): 938–940. doi:10.1021/ic50039a050.
  4. Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 1977-09-01. p. 8. ISBN   978-0-08-057869-9.
  5. Yasuda, Kouji; Saegusa, Kunio; Okabe, Toru H. (January 2011). "Aluminum Subhalide as a Reductant for Metallothermic Reduction". High Temperature Materials and Processes. 30 (4–5). doi:10.1515/htmp.2011.063. Open Access logo PLoS transparent.svg
  6. Meyer, Gerd (September 1983). "Reduced ternary rare earth halides: State of the art". Journal of the Less Common Metals. 93 (2): 371–380. doi:10.1016/0022-5088(83)90190-X.