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Terbium(III) iodide

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Terbium(III) iodide
Names
Other names terbium triiodide
Identifiers
CAS Number	13813-40-6^Y
3D model (JSmol)	Interactive image
ChemSpider	75569
ECHA InfoCard	100.034.049
EC Number	237-469-8
PubChem CID	83747
CompTox Dashboard (EPA)	DTXSID0065644
InChI Key: OJXRJPFRTRETRN-UHFFFAOYSA-K InChI=1S/3HI.Tb/h3*1H;/q;;;+3/p-3
SMILES I[Tb](I)I
Properties
Chemical formula	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
Crystal structure	hexagonal
Hazards
GHS labelling:^[1]
Pictograms
Signal word	Warning
Hazard statements	H317, H361
Precautionary statements	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). N verify (what is ^YN ?) Infobox references

Terbium(III) iodide (Tb I₃) 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 hydroxideorterbium 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]

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]

^ ^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.

Terbium(III)

Terbium(III,IV)

Terbium(IV)

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