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Thulium(II) iodide

Names
Other names Thulium diiodide
Identifiers
CAS Number	60864-26-8
3D model (JSmol)	Interactive image
ChemSpider	4401179
ECHA InfoCard	100.151.436
EC Number	622-686-6
PubChem CID	5231385
CompTox Dashboard (EPA)	DTXSID40411818
InChI InChI=1S/2HI.Tm/h2*1H;/q;;+2/p-2Key: XGGRJQVPUOEAEU-UHFFFAOYSA-L
SMILES II
Properties
Chemical formula	I2Tm
Molar mass	422.74316 g·mol
Appearance	Dark brown hexagonal crystals
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Thulium(II) iodide is an inorganic compound with the chemical formula TmI₂.

Preparation and properties

Thulium(II) iodide can be obtained by reacting thulium(III) iodide and alkali metals in a tantalum container at 700~800°C. TmI₂ can be obtained by using lithium and sodium as reducing agents, while potassium, rubidium and caesium can generate the perovskite structure MTmI₃. TmI₂ can also react directly with CsI (340 °C) to generate CsTmI₃.

Thulium(II) iodide can also be prepared by reacting thulium and mercury(I) iodide. The reaction process is as follows:

2 Tm + 3 HgI₂ → 2 TmI₃ + 3 Hg

Tm + HgI₂ → TmI₂ + Hg

Tm + 2 TmI₃ → 3 TmI₂

References

1. ^ Shihua, Wang; Yaping, Gu; Shengbang, Jiang (1987). "FORMATION MECHANISM OF TmI₂ IN Tm-HgI₂ SYSTEM". Acta Physico-Chimica Sinica. 3 (03): 334–336. doi:10.3866/pku.whxb19870320. ISSN 1000-6818.
2. Schilling, Gaby; Kunert, Christine; Schleid, Thomas; Meyer, Gerd (Dec 1992). "Metallothermische Reduktion der Tribromide und -iodide von Thulium und Ytterbium mit Alkalimetallen". Zeitschrift für anorganische und allgemeine Chemie. 618 (12): 7–12. doi:10.1002/zaac.19926180102. ISSN 0044-2313.
3. 罗时敏,王世华.CsTmI₃生成机理及其相转变.物理化学学报,1990(01):93-96.

• Thulium compounds
• Iodides
• Lanthanide halides