• Source: Europium(III) iodide

Europium(III) iodide is an inorganic compound containing europium and iodine with the chemical formula EuI3.




Preparation


Europium metal reacts directly with iodine to form europium(III) iodide:

2 Eu + 3 I2 → 2 EuI3
Hydrated europium(III) iodide can be prepared dissolving europium(III) oxide or europium(III) carbonate in hydroiodic acid:

Eu2O3 + 6 HI + 6 H2O → 2 EuI3·9H2O
Europium powder reacts with iodine in THF to form a THF adduct of europium(III) iodide:

2 Eu + 3 I2 + 7 THF → [EuI2(THF)5][EuI4(THF)2]
The adduct can be formulated more simply as EuI3(THF)3.5.




Structure


Europium(III) iodide adopts the bismuth(III) iodide (BiI3) crystal structure type, with octahedral coordination of each Eu3+ ion by 6 iodide ions.




Reactivity


Europium(III) iodide is used as the starting material for two of the main ways of preparing europium(II) iodide:
Reduction with hydrogen gas at 350 °C:

2 EuI3 + H2 → 2 EuI2 + 2 HI
Thermal decomposition at 200 °C, a disproportionation reaction:

2 EuI3 → 2 EuI2 + 2 I2
Europium(III) iodide nonahydrate, EuI3·9H2O, thermally decomposes to europium(II) iodide dihydrate, EuI2·H2O.




References

Kata Kunci Pencarian:

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