Europium(III) iodide explained

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

Preparation

Europium metal reacts directly with iodine to form europium(III) iodide:^[1]

Hydrated europium(III) iodide can be prepared dissolving europium(III) oxide or europium(III) carbonate in hydroiodic acid:^[2]

Europium powder reacts with iodine in THF to form a THF adduct of europium(III) iodide:^{[3] [4]}

The adduct can be formulated more simply as .

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:^[5]

Reduction with hydrogen gas at 350 °C:

Thermal decomposition at 200 °C, a disproportionation reaction:

Europium(III) iodide nonahydrate, EuI₃·9H₂O, thermally decomposes to europium(II) iodide dihydrate, EuI₂·H₂O.^[6]

Notes and References

1. Book: A. F. . Holleman . E. . Wiberg . Inorganic Chemistry . Academic Press . San Diego . 2001 . 0-12-352651-5 .
2. Emel'yanov . V. I. . Kuznetsova . L. I. . Abramova . L. V. . Ezhov . A. I. . Systems Eu₂O₃-HI-H₂O and EuI₃-HI-H₂O at 25°C . . 1997 . 42 . 8 . 1394–1396 .
3. Rare Earth Starting Materials and Methodologies for Synthetic Chemistry . Fabrizio . Ortu . . 2022 . 122 . 6040–6116 . 10.1021/acs.chemrev.1c00842 . free . 9007467 .
4. Thaige P. . Gompa . Natalie T. . Rice . Dominic R. . Russo . Luis M. . Aguirre Quintana . Brandon J. . Yik . John . Basca . Henry S. . La Pierre . Diethyl ether adducts of trivalent lanthanide iodides . . 48 . 2019 . 8030–8033 . 10.1039/C9DT00775J .
5. Book: Brauer, Georg. Georg Brauer. 1975. Handbook of Preparative Inorganic Chemistry. 3-432-02328-6.
6. Charles M. . Jenden . Samuel J. . Lyle . A Mössbauer spectroscopic study of the lodides of europium . . 1982 . 12 . 2409-2414 . 10.1039/DT9820002409 .