 | |
| Names | |
|---|---|
| IUPAC name Europium(II) iodide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.040.641 |
| EC Number |
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| |
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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 inTHF | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Europium(II) iodide is theiodide salt of divalenteuropium cation.
Europium(II) iodide can be prepared in a handful of ways, including:
Reduction ofeuropium(III) iodide withhydrogen gas at 350 °C:[1]
Thermal decomposition ofeuropium(III) iodide at 200 °C:[1]
Reaction of europium withmercury(II) iodide:[1]
Reaction of europium withammonium iodide:[1]
Europium(II) iodide has severalpolymorphs.[2] It adopts amonocliniccrystal structure inspace group P 21/c (no. 14).[3][4]
It also adopts anorthorhombic polymorph inspace groupPbca (no. 61). This form isisostructural withstrontium 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) inliquid ammonia. This low-temperature phase isorthorhombic and inspace groupPnma (no. 62). This is the same structure as modification IV of strontium iodide.[6]
