Europium(II) chloride

Europium(II) chloride is an inorganic compound with a chemical formula EuCl₂. When it is irradiated by ultraviolet light, it has bright blue fluorescence.^[3]

Europium(II) chloride

Names
Other names Europium dichloride
Identifiers
CAS Number	13769-20-5 dry Y 70442-98-7 dihydrate Y
3D model (JSmol)	Interactive image
ChemSpider	75541
ECHA InfoCard	100.033.973
EC Number	237-386-7
PubChem CID	83719
CompTox Dashboard (EPA)	DTXSID2065620
InChI InChI=1S/2ClH.Eu/h2*1H;/q;;+2/p-2 Key: BMANZYKPCBPZFG-UHFFFAOYSA-L
SMILES Cl[Eu]Cl
Properties
Chemical formula	Cl2Eu
Molar mass	222.86 g·mol−1
Appearance	white solid
Density	4.86 g·cm−3[1]
Melting point	738 °C (1,011 K)[2]
Boiling point	2,190 °C (2,460 K)[2]
Related compounds
Other anions	europium difluoride europium dibromide europium diiodide
Other cations	samarium dichloride thulium dichloride
Related compounds	europium trichloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Europium dichloride can be produced by reducing europium trichloride with hydrogen gas at high temperature:^[4]

2 EuCl₃ + H₂ → 2 EuCl₂ + 2 HCl

If dry europium trichloride reacts with lithium borohydride in THF, it can also produce europium dichloride:^[5]

2 EuCl₃ + 2 LiBH₄ → 2 EuCl₂ + 2 LiCl + H₂↑ + B₂H₆↑

Properties

Europium dichloride can form yellow ammonia complexes:EuCl₂•8NH₃, and can dissolve to pale yellowish EuCl₂•NH₃.^[4] Europium dichloride can react with europium hydride at 120-bar H₂, producing EuClH that fluoresces green.^[6]