Gadolinium(III) iodide

Gadolinium(III) iodide is an iodide of gadolinium, with the chemical formula of GdI₃. It is a yellow, highly hygroscopic solid with a bismuth(III) iodide-type crystal structure. In air, it quickly absorbs moisture and forms hydrates. The corresponding oxide iodide is also readily formed at elevated temperature.^[2]

Gadolinium(III) iodide

Identifiers
CAS Number	13572-98-0 Y
3D model (JSmol)	Interactive image
ChemSpider	75418
ECHA InfoCard	100.033.619
EC Number	236-997-6
PubChem CID	25212328
CompTox Dashboard (EPA)	DTXSID2065543
InChI InChI=1S/Gd.3HI/h;3*1H/q+3;;;/p-3 Key: IZZTUGMCLUGNPM-UHFFFAOYSA-K
SMILES [I-].[I-].[I-].[Gd+3]
Properties
Chemical formula	GdI3
Molar mass	537.96 g/mol−1
Appearance	yellow solid
Melting point	926 °C[1]
Boiling point	1340 °C[2]
Hazards
GHS labelling:
Pictograms
Signal word	Danger[1]
Hazard statements	H317, H360
Precautionary statements	P201, P280, P308+P313[1]
Related compounds
Other anions	Gadolinium(III) fluoride Gadolinium(III) chloride Gadolinium(III) bromide
Other cations	Europium(III) iodide Terbium(III) iodide Samarium(III) iodide
Related compounds	Gadolinium(II) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Gadolinium(III) iodide can be obtained by reacting gadolinium with iodine:^[2]

2 Gd + 3 I₂ → 2 GdI₃

It can also be obtained by reacting gadolinium with mercury(II) iodide in a vacuum at 500 °C:^[2]

2 Gd + 3 HgI₂ → 2 GdI₃ + 3 Hg

Gadolinium(III) iodide can be obtained by the reaction between gadolinium(III) oxide and hydroiodic acid, crystallizing into the hydrate form. The hydrate form can be heated with ammonium iodide to form the anhydrous form.^[2][3]

Gd₂O₃ + 6 HI → 2 GdI₃ + 3 H₂O

Reactions

Gadolinium(III) iodide reacts with gadolinium and zinc in an argon atmosphere heated to 850 °C to obtain Gd₇I₁₂Zn.^[4] It reacts with gadolinium, carbon, and gadolinium nitride in a tantalum tube at 897 °C to obtain nitrocarbide Gd₄I₆CN.^[5]

References

1. Sigma-Aldrich Co., product no. {{{id}}}.
2. Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1077.
3. Kutscher, J.; Schneider, A. Preparation of anhydrous lanthanide halides, especially iodides. Inorganic and Nuclear Chemistry Letters, 1971. 7 (9): 815-819.
4. Mar’yana Lukachuk, Lorenz Kienle, Chong Zheng, Hansjürgen Mattausch, Arndt Simon (2008-06-02). "Gd 7 I 12 Zn: A Group 12 Atom in the Octahedral Gd 6 Cluster". Inorganic Chemistry. 47 (11): 4656–4660. doi:10.1021/ic800024n. ISSN 0020-1669. PMID 18426200. Archived from the original on 2022-04-23. Retrieved 2022-07-08.{{cite journal}}: CS1 maint: multiple names: authors list (link)
5. Mattausch, Hansjurgen; Borrmann, Horst; Eger, Roland; Kremer, R. K.; Simon, Arndt. Gd₄I₆CN: A carbide nitride with chains of Gd₆(C₂) octahedra and Gd₆N₂ double tetrahedra. Zeitschrift fuer Anorganische und Allgemeine Chemie (1994), 620 (11): 1889-1897.

External reading

• Asprey, L. B.; Keenan, T. K.; Kruse, F. H. Preparation and crystal data for lanthanide and actinide triiodides. Inorg. Chem., 1964. 3 (8): 1137-1240