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Holmium(III) iodide

From Wikipedia, the free encyclopedia
Holmium(III) iodide
Names
Other names
Holmium iodide
Holmium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.034.050Edit this at Wikidata
EC Number
  • 237-470-3
  • InChI=1S/Ho.3HI/h;3*1H/q+3;;;/p-3
    Key: KXCRAPCRWWGWIW-UHFFFAOYSA-K
  • [Ho+3].[I-].[I-].[I-]
Properties
HoI3
Molar mass545.6437 g/mol
AppearancePale-yellow solid[1][2]
Density5.4 g/cm3[3]
Melting point994 °C[2]
Boiling point1300 °C[4]
soluble inwater[2]
Hazards
GHS labelling:[1]
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 theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Holmium(III) iodide is aniodide ofholmium, with thechemical formula of HoI3. It is used as a component ofmetal halide lamps.[5]

Preparation

[edit]

Holmium(III) iodide can be obtained by directly reactingholmium andiodine:[4]

2 Ho + 3 I2 → 2 HoI3

Holmium(III) iodide can also be obtained via the direct reaction between holmium andmercury(II) iodide:

2 Ho + 3 HgI2 → 2 HoI3 + 3 Hg

Themercury produced in the reaction can be removed bydistillation.[6]

Holmium(III) iodide hydrate can be converted to theanhydrous form by dehydration with a large excess ofammonium iodide (since the compound is prone tohydrolysis).[4]

Properties

[edit]

Holmium(III) iodide is a highlyhygroscopic substance that dissolves in water.[7][3][2] It forms yellow hexagonal crystals with a crystal structure similar tobismuth(III) iodide.[4] In air, it quickly absorbs moisture and formshydrates. The corresponding oxide iodide is also readily formed at elevated temperature.[4]

References

[edit]
  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. ^abcd"13635 Holmium(III) iodide, ultra dry, 99.99% (REO)". Alfa Aesar. Retrieved2022-08-20.
  3. ^abCarl L. Yaws (2015).The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Gulf Professional Publishing. p. 301.ISBN 978-0128011461. Retrieved2017-08-28.
  4. ^abcdeGeorg Brauer (Hrsg.), unter Mitarbeit vonMarianne 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. Retrieved2022-08-20.
Salts and covalent derivatives of theiodide ion
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