Tellurium iodide is an

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

with the formula Teiodide, I. Two forms are known. Their structures differ from the other monohalides of tellurium. There are three subhalide, subiodides of tellurium, α-TeI, β-TeI, and Te₂I, and one tellurium tetraiodide.

Preparation and properties

TeI is a gray solid formed by the solvothermal synthesis, solvothermal reaction of tellurium metal and iodine in hydroiodic acid, hydroiodic or chloroaluminate, chloroaluminic acid. When this reaction is conducted near 270 °C gives the α-TeI, which is triclinic. When the same mixture is heated to 150 °C, one obtains the metastable monoclinic phase β-TeI.R. Kniep, D. Mootz, A. Rabenau "Zur Kenntnis der Subhalogenide des Tellurs" Zeitschrift für anorganische und allgemeine Chemie 1976, Volume 422, pages 17–38. The compounds are related structurally to Te₂I (see ditellurium bromide), but the additional iodide groups do not bridge to other Te centers. The corresponding monochloride and monobromide are molecular compounds with the formula Te₂X₂.Zhengtao Xu "Recent Developments in Binary Halogen–Chalcogen Compounds, Polyanions and Polycations" in Handbook of Chalcogen Chemistry: New Perspectives in Sulfur, Selenium and Tellurium, Francesco Devillanova, Editor, 2006, RSC. pp. 381-416. Royal Society

Tellurium diiodide

Although TeI₂ has not been isolated in bulk, complexes of the type TeI₂(thiourea)₂ are well characterized. These complexes precipitate upon treatment of aqueous solutions of the related tellurium dibromide complex with sodium iodide.

References

{{Tellurium compounds Iodides Tellurium halides Tellurium compounds Chalcohalides