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Ytterbium(III) iodide

Ytterbium(III) iodide is one of ytterbium's iodides, with the chemical formula of YbI<sub>3</sub>.

Preparation

Ytterbium(III) iodide can be prepared by reacting metallic ytterbium with iodine at 500°C with a 30 atm pressure:

2 Yb + 3 I<sub>2</sub> → 2 YbI<sub>3</sub>

Ytterbium(III) oxide, ytterbium(III) hydroxide or ytterbium(III) carbonate can react with hydroiodic acid to obtain ytterbium(III) iodide in aqueous solution:

Yb<sub>2</sub>O<sub>3</sub> + 6 HI → 2 YbI<sub>3</sub> + 3 H<sub>2</sub>O
Yb(OH)<sub>3</sub> + 3 HI → YbI<sub>3</sub> + 3 H<sub>2</sub>O
Yb<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> + 6 HI → 2 YbI<sub>3</sub> + 3 H<sub>2</sub>O + 3 CO<sub>2</sub>

The ytterbium(III) iodide hydrate crystallized from the solution can be heated with ammonium iodide to obtain the anhydrous form.

Reactions

Ytterbium(III) iodide decomposes to ytterbium(II) iodide upon heating:

2 YbI<sub>3</sub> → 2 YbI<sub>2</sub> + I<sub>2</sub>

References