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Terbium(III) iodide

Chemical compound From Wikipedia, the free encyclopedia

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Terbium(III) iodide (TbI3) is an inorganic chemical compound.

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Preparation

Terbium(III) iodide can be produced by reacting terbium and iodine.[2]

2 Tb + 3 I2 → 2 TbI3

Terbium iodide hydrate can be crystallized from solution by reacting hydriodic acid with terbium, terbium(III) oxide, terbium hydroxide or terbium carbonate:

2 Tb + 6 HI → 2 TbI3 + 3 H2
Tb2O3 + 6 HI → 2 TbI3 + 3 H2O
2 Tb(OH)3 + 6 HI → 2 TbI3 + 3 H2O
Tb2(CO3)3 + 6 HI → 2 TbI3 + 3 H2O + 3 CO2

An alternative method is reacting terbium and mercury(II) iodide at 500 °C.[3]

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Structure

Terbium(III) iodide adopts the bismuth(III) iodide (BiI3) crystal structure type,[4][3] with octahedral coordination of each Tb3+ ion by 6 iodide ions.[5]

References

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