Английская Википедия:Holmium(III) iodide

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Holmium(III) iodide is an iodide of holmium, with the chemical formula of HoI3. It is used as a component of metal halide lamps.[1]

Preparation

Holmium(III) iodide can be obtained by directly reacting holmium and iodine:[2]

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.[3]

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).[2]

Properties

Holmium(III) iodide is a highly hygroscopic substance that dissolves in water.[4][5][6] It forms yellow hexagonal crystals with a crystal structure similar to bismuth(III) iodide.[2] In air, it quickly absorbs moisture and forms hydrates. The corresponding oxide iodide is also readily formed at elevated temperature.[2]

References

Шаблон:Reflist

Шаблон:Holmium compounds Шаблон:Iodides Шаблон:Lanthanide halides

  1. Шаблон:Cite book
  2. 2,0 2,1 2,2 2,3 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.
  3. Шаблон:Cite journal
  4. Шаблон:Cite web
  5. Шаблон:Cite book
  6. Шаблон:Cite web