• Source: Europium(II) iodide

Europium(II) iodide is the iodide salt of divalent europium cation.




Preparation


Europium(II) iodide can be prepared in a handful of ways, including:
Reduction of europium(III) iodide with hydrogen gas at 350 °C:

2 EuI3 + H2 → 2 EuI2 + 2 HI
Thermal decomposition of europium(III) iodide at 200 °C:

2 EuI3 → 2 EuI2 + 2 I2
Reaction of europium with mercury(II) iodide:

Eu + HgI2 → Eu I2 + Hg
Reaction of europium with ammonium iodide:

Eu + 2 NH4I → EuI2 + 2 NH3 + H2




Structure


Europium(II) iodide has several polymorphs. It adopts a monoclinic crystal structure in space group P 21/c (no. 14).
It also adopts an orthorhombic polymorph in space group Pbca (no. 61). This form is isostructural with strontium iodide.
A third polymorph of europium(II) iodide is formed if it is prepared from europium and ammonium iodide at low temperatures (200 K) in liquid ammonia. This low-temperature phase is orthorhombic and in space group Pnma (no. 62). This is the same structure as modification IV of strontium iodide.




References

Kata Kunci Pencarian:

• Europium(II) iodida
• Europium(III) iodida
• Neodimium(II) iodida
• Samarium(II) iodida
• Gadolinium(III) iodida
• Samarium(III) klorida
• Bilangan oksidasi
• Iterbium
• Fosforus
• Iodin
• Europium(II) iodide
• Europium iodide
• Europium(III) iodide
• Europium
• Samarium(II) iodide
• Europium halide
• Europium compounds
• Strontium iodide
• List of CAS numbers by chemical compound
• Europium(III) chloride