Holmium(III) iodide

Names
Other names

Holmium iodide
Holmium triiodide

Identifiers

CAS Number

* 13813-41-7 Y

3D model (JSmol)

* Interactive image

EC Number |

* 237-470-3

PubChem CID

* 83748

InChI

* InChI=1S/Ho.3HI/h;3*1H/q+3;;;/p-3

Key: KXCRAPCRWWGWIW-UHFFFAOYSA-K

SMILES

* [Ho+3].[I-].[I-].[I-]

Properties

Chemical formula

| HoI3
Appearance  | Pale-yellow solid[1][2]
Density | 5.4 g/cm3[3]
Melting point | 994 °C[2]
Boiling point | 1300 °C[4]

Solubility in water

| 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

1. ↑ 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. ↑ 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. ↑ 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. ↑ 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.
5. ↑ 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.
6. ↑ 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/.
7. ↑ "Holmium triiodide". WebElements. http://www.webelements.com/compounds/holmium/holmium_triiodide.html.

* v
* t
* e

Holmium compounds

* HoBr3
* HoCl3
* Ho2O3
* Ho2Ti2O7

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

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