Chemistry:Thulium(II) iodide

Thulium(II) iodide
Names
	Other names Thulium diiodide
Identifiers
CAS Number	60864-26-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	4401179;
EC Number	622-686-6;
PubChem CID	5231385;
	InChI InChI=1S/2HI.Tm/h2*1H;/q;;+2/p-2 Key: XGGRJQVPUOEAEU-UHFFFAOYSA-L;
	SMILES I[Tm]I;
Properties
Chemical formula	I2Tm
Molar mass	422.74316 g·mol−1
Appearance	Dark brown hexagonal crystals
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Thulium diiodide is an inorganic compound with the chemical formula TmI₂.

Preparation and properties

Thulium diiodide 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.^[2] TmI₂ can also react directly with CsI (340 °C) to generate CsTmI₃.^[3]

Thulium iodide can also be prepared by reacting thulium and mercury(I) iodide. The reaction process is as follows:^[1]

2 Tm + 3 HgI
2 → 2 TmI
3 + 3 Hg

Tm + HgI
2 → TmI
2 + Hg

Tm + 2 TmI
3 → 3 TmI
2

↑ ^1.0 ^1.1 Shihua, Wang; Yaping, Gu; Shengbang, Jiang (1987). "FORMATION MECHANISM OF TmI<SUB>2</SUB> IN Tm-HgI<SUB>2 </SUB>SYSTEM". Acta Physico-Chimica Sinica 3 (03): 334–336. doi:10.3866/pku.whxb19870320. ISSN 1000-6818. http://dx.doi.org/10.3866/pku.whxb19870320.
↑ 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. http://dx.doi.org/10.1002/zaac.19926180102.
↑ 罗时敏,王世华.CsTmI₃生成机理及其相转变[J].物理化学学报,1990(01):93-96.

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