Terbium(III) iodide

Terbium(III) iodide
Names
Other names
terbium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.049 Edit this at Wikidata
EC Number
  • 237-469-8
  • Key: OJXRJPFRTRETRN-UHFFFAOYSA-K
  • InChI=1S/3HI.Tb/h3*1H;/q;;;+3/p-3
  • I[Tb](I)I
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]
GHS07: Exclamation markGHS08: Health hazard
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

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

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

  1. ^ "Terbium iodide (TbI3)". pubchem.ncbi.nlm.nih.gov.
  2. ^ WebElements: Chemical reactions of the element Terbium
  3. ^ 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.
  4. ^ Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
  5. ^ 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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