Europium dichloride

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Europium dichloride
Cotunnite structure.png
Anode precipitate of EuCl2.jpg
Other names
Europium(II) chloride
3D model (JSmol)
ECHA InfoCard 100.033.973 Edit this at Wikidata
EC Number
  • 237-386-7
  • InChI=1S/2ClH.Eu/h2*1H;/q;;+2/p-2
  • Cl[Eu]Cl
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).

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


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


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]


  1. ^ Roger Blachnik (Hrsg.): Taschenbuch für Chemiker und Physiker. Band III: Elemente, anorganische Verbindungen und Materialien, Minerale. begründet von Jean d’Ans, Ellen Lax. 4., neubearbeitete und revidierte Auflage. Springer, Berlin 1998, ISBN 3-540-60035-3, S. 446–447
  2. ^ a b Polyachenok, O. G.; Novikov, G. I. Saturated vapor pressures of SmCl2, EuCl2, YbCl2. Zhurnal Neorganicheskoi Khimii, 1963. 8 (12): 2631–2634. ISSN 0044-457X.
  3. ^ Howell, J.K.; Pytlewski, L.L. (August 1969). "Synthesis of divalent europium and ytterbium halides in liquid ammonia". Journal of the Less Common Metals. 18 (4): 437–439. doi:10.1016/0022-5088(69)90017-4.
  4. ^ a b Klemm, Wilhelm; Doll, Walter. Measurements on the bivalent and the quadrivalent compounds of the rare earths. VI. The halides of bivalent europium. Zeitschrift für Anorganische und Allgemeine Chemie, 1939. 241: 233–238. ISSN 0044-2313.
  5. ^ Rossmanith, K.; Muckenhuber, E. Reaction of rare earth chlorides with lithium borohydride. II. Monatshefte fuer Chemie, 1961. 92: 600–604. ISSN 0026-9247.
  6. ^ Kunkel, Nathalie; Rudolph, Daniel; Meijerink, Andries; Rommel, Stefan; Weihrich, Richard; Kohlmann, Holger; Schleid, Thomas (2015). "Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl". Zeitschrift für anorganische und allgemeine Chemie. 641 (7): 1220–1224. doi:10.1002/zaac.201400531. ISSN 0044-2313.