Terbium(III) iodide
| Names | |
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| Other names
terbium triiodide
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.034.049 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| TbI3 | |
| Molar mass | 539.638 g/mol |
| Appearance | hygroscopic crystals |
| Density | 5.2 g/cm3, solid |
| Melting point | 957 °C (1,755 °F; 1,230 K) |
| Structure | |
| hexagonal | |
| Hazards | |
| GHS labelling:[1] | |
 
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| Warning | |
| H317, H361 | |
| P201, P202, P261, P264, P271, P272, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P332+P313, P333+P313, P337+P313, P362, P363, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Terbium(III) iodide (TbI3) is an inorganic chemical compound.
Preparation[edit]
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]
Structure[edit]
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[edit]
- ^ "Terbium iodide (TbI3)". pubchem.ncbi.nlm.nih.gov.
- ^ WebElements: Chemical reactions of the element Terbium
- ^ a b Asprey, L. B.; Keenan, T. K.; Kruse, F. H. (1964). "Preparation and Crystal Data for Lanthanide and Actinide Triiodides". Inorg. Chem. 3 (8): 1137–1141. doi:10.1021/ic50018a015.
- ^ Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1240–1241. ISBN 978-0-08-037941-8.
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