Thulium(II) iodide

Thulium(II) iodide
Names
	Other names Thulium diiodide
Identifiers
CAS Number	60864-26-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.151.436
CompTox Dashboard (EPA)	DTXSID40411818 ;
	SMILES I[Tm]I;
Properties
Chemical formula	TmI2
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[edit]

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 HgI₂ → 2 TmI₃ + 3 Hg

Tm + HgI₂ → TmI₂ + Hg

Tm + 2 TmI₃ → 3 TmI₂

^ ^a ^b 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.
^ 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.
^ 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.