Holmium(III) iodide

The article presented below will address the topic of Holmium(III) iodide, which currently arouses great interest and curiosity. Holmium(III) iodide has been the subject of debate and reflection in different areas, from the academic to the social. Throughout history, Holmium(III) iodide has played a significant role in the evolution of society, influencing not only individual decisions, but also the culture and values ​​of an era. Through this article, we aim to deepen the knowledge and understanding of Holmium(III) iodide, exploring its different dimensions and its impact on daily life.

Holmium(III) iodide
Names
Other names
Holmium iodide
Holmium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.050 Edit this at Wikidata
EC Number
  • 237-470-3
  • InChI=1S/Ho.3HI/h;3*1H/q+3;;;/p-3
    Key: KXCRAPCRWWGWIW-UHFFFAOYSA-K
  • ...
Properties
HoI3
Molar mass 545.6437 g/mol
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]
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazard
Danger
H315, H319, H335, H360
P203, P233, P260, P261, P264, P264+P265, P271, P272, P280, P284, P302+P352, P304+P340, P305+P351+P338, P318, P319, P321, P332+P317, P333+P317, P337+P317, P342+P316, P362+P364, P403, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).

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" [Halides of the rare earths. VI. Halides of the terbium and erbium earth groups]. Zeitschrift für Anorganische und Allgemeine Chemie (in German). 207 (4): 353–367. doi:10.1002/zaac.19322070404.
  2. ^ a b c d "13635 Holmium(III) iodide, ultra dry, 99.99% (REO)". Alfa Aesar. Retrieved 2022-08-20.
  3. ^ a b Carl L. Yaws (2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Gulf Professional Publishing. p. 301. ISBN 978-0128011461. Retrieved 2017-08-28.
  4. ^ a b c d e 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). Light and Light Sources: High-Intensity Discharge Lamps. Springer. p. 45. ISBN 978-3540326854.
  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.
  7. ^ "Holmium triiodide". WebElements. Retrieved 2022-08-20.