Thulium(III) iodide
Chemical compound
From Wikipedia, the free encyclopedia
Thulium(III) iodide is an iodide of thulium, with the chemical formula of TmI3. Thulium(III) iodide is used as a component of metal halide lamps.[3]
-iodid.png)
| |
_iodide_crystals_in_glass_ampoule.jpg) | |
| Names | |
|---|---|
| Other names
Thulium iodide Thulium triiodide | |
| Identifiers | |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.034.052 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| TmI3 | |
| Appearance | Yellow hexagonal crystal[1] |
| Melting point | 1015 °C[2] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Preparation
Mercury(II) iodide can be heated with thulium to obtain thulium(III) iodide:[4]
- 2 Tm + 3 HgI2 → 2 TmI3 + 3 Hg
The mercury produced in the reaction can be removed by distillation.[5][4]
The thulium(III) iodide hydrate crystallized from solution can be heated with ammonium iodide to obtain the anhydrous form.[6][4]
Properties
Thulium(III) iodide is a yellow, highly hygroscopic solid with a bismuth(III) iodide-type crystal structure.[4] It forms in the hexagonal crystal system.[6] Its hydrate can be heated in air to obtain TmOI. Its anhydrous form can be heated with thulium to obtain TmI2:[7]
- 2 TmI3 + Tm → 3 TmI2