Europium(II) iodide
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| IUPAC name
Europium(II) iodide
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| Identifiers | |
3D model (
JSmol ) |
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| ChemSpider | |
ECHA InfoCard
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100.040.641 |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| EuI 2 | |
| Molar mass | 405.77 g/mol |
| Appearance | Tea yellow powder |
| Melting point | 510 °C (950 °F; 783 K) |
| Boiling point | 1,120 °C (2,050 °F; 1,390 K) |
| Soluble in THF | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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:[1]
- 2 EuI3 + H2 → 2 EuI2 + 2 HI
Thermal decomposition of europium(III) iodide at 200 °C:[1]
- 2 EuI3 → 2 EuI2 + 2 I2
Reaction of europium with mercury(II) iodide:[1]
- Eu + HgI2 → Eu I2 + Hg
Reaction of europium with ammonium iodide:[1]
- Eu + 2 NH4I → EuI2 + 2 NH3 + H2
Structure
Europium(II) iodide has several
It also adopts an orthorhombic polymorph in space group Pbca (no. 61). This form is isostructural with strontium iodide.[5]
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.[6]
References
- ^ ISBN 3-432-02328-6.
- ISBN 978-0-19-965763-6.
- Z. Kristallogr.128: 430.
- .
- ^ Bärnighausen, H.; Beck, H. P.; Grueninger, H. W. (1971). "Search Results - Access Structures". Rare Earths Mod. Sci. Technol. 9: 74–.
- .
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