Chemistry:Holmium(III) iodide
-iodid.png)
| |
| Names | |
|---|---|
| Other names
Holmium iodide
Holmium triiodide | |
| Identifiers | |
3D model (JSmol)
|
|
| EC Number |
|
PubChem CID
|
|
| |
| |
| Properties | |
| HoI3 | |
| Appearance | Pale-yellow solid[1][2] |
| Density | 5.4 g/cm3[3] |
| Melting point | 994 °C[2] |
| Boiling point | 1300 °C[4] |
| soluble in water[2] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Holmium(III) iodide is an iodide of holmium, with the chemical formula of HoI3. It is used as a component of metal halide lamps.[5]
Preparation
Holmium(III) iodide can be obtained by directly reacting holmium and iodine:[4]
- 2 Ho + 3 I2 → 2 HoI3
Holmium(III) iodide can also be obtained via the direct reaction between holmium and mercury(II) iodide:
- 2 Ho + 3 HgI2 → 2 HoI3 + 3 Hg
The mercury produced in the reaction can be removed by distillation.[6]
Holmium(III) iodide hydrate can be converted to the anhydrous form by dehydration with a large excess of ammonium iodide (since the compound is prone to hydrolysis).[4]
Properties
Holmium(III) iodide is a highly hygroscopic substance that dissolves in water.[7][3][2] It forms yellow hexagonal crystals with a crystal structure similar to bismuth(III) iodide.[4] In air, it quickly absorbs moisture and forms hydrates. The corresponding oxide iodide is also readily formed at elevated temperature.[4]
References
- ↑ Jantsch, G.; Jawurek, H.; Skalla, N.; Gawalowski, H. (1932). "Zur Kenntnis der Halogenide der seltenen Erden. VI. Über die Halogenide der Terbin- und Erbinerdengruppe". Zeitschrift für Anorganische und Allgemeine Chemie 207 (4): 353–367. doi:10.1002/zaac.19322070404.
- ↑ 2.0 2.1 2.2 2.3 "13635 Holmium(III) iodide, ultra dry, 99.99% (REO)". Alfa Aesar. https://www.alfa.com/en/catalog/013635.
- ↑ 3.0 3.1 Carl L. Yaws (2015) (in en). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Gulf Professional Publishing. p. 301. ISBN 978-0128011461. https://books.google.com/books?id=mr7zb-LJvO4C&pg=PA301. Retrieved 2017-08-28.
- ↑ 4.0 4.1 4.2 4.3 4.4 Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1077.
- ↑ Flesch, Peter G. (2007). [[[:Template:Google books URL]] Light and Light Sources: High-Intensity Discharge Lamps]. Springer. p. 45. ISBN 978-3540326854. Template:Google books URL.
- ↑ Asprey, L. B.; Keenan, T. K.; Kruse, F. H. (1964). "Preparation and crystal data for lanthanide and actinide triiodides". Inorganic Chemistry 3 (8): 1137–1141. doi:10.1021/ic50018a015. https://digital.library.unt.edu/ark:/67531/metadc867868/.
- ↑ "Holmium triiodide". WebElements. http://www.webelements.com/compounds/holmium/holmium_triiodide.html.
| HI | He | ||||||||||||||||
| LiI | BeI2 | BI3 | CI4 | NI3 | I2O4, I2O5, I4O9 |
IF, IF3, IF5, IF7 |
Ne | ||||||||||
| NaI | MgI2 | AlI3 | SiI4 | PI3, P2I4 |
S | ICl, ICl3 |
Ar | ||||||||||
| KI | CaI2 | Sc | TiI4 | VI3 | CrI3 | MnI2 | FeI2 | CoI2 | NiI2 | CuI | ZnI2 | Ga2I6 | GeI2, GeI4 |
AsI3 | Se | IBr | Kr |
| RbI | SrI2 | YI3 | ZrI4 | NbI5 | Mo | Tc | Ru | Rh | Pd | AgI | CdI2 | InI3 | SnI4, SnI2 |
SbI3 | TeI4 | I | Xe |
| CsI | BaI2 | HfI4 | TaI5 | W | Re | Os | Ir | Pt | AuI | Hg2I2, HgI2 |
TlI | PbI2 | BiI3 | Po | AtI | Rn | |
| Fr | RaI2 | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |
| ↓ | |||||||||||||||||
| La | Ce | Pr | Nd | Pm | SmI2 | Eu | Gd | TbI3 | Dy | Ho | Er | Tm | Yb | Lu | |||
| Ac | ThI4 | Pa | UI3, UI4 |
Np | Pu | Am | Cm | Bk | Cf | EsI3 | Fm | Md | No | Lr | |||
 |  |
