Tellurium iodide is an

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

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

tellurium tetraiodide Tellurium tetraiodide ( Te I4) is an inorganic chemical compound. It has a tetrameric structure which is different from the tetrameric solid forms of TeCl4 and TeBr4. In TeI4 the Te atoms are octahedrally coordinated and edges of the octahedra a ...

Preparation and properties

TeI is a gray solid formed by the

hydrothermal reaction Hydrothermal synthesis includes the various techniques of crystallizing substances from high-temperature aqueous solutions at high vapor pressures; also termed "hydrothermal method". The term "hydrothermal" is of Geology, geologic origin. Geochemi ...

of tellurium metal and

iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...

in hydroiodic 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. The compounds are related structurally to Te₂I (see

ditellurium bromide Ditellurium bromide is the inorganic compound with the formula Te2 Br. It is one of the few stable lower bromides of tellurium. Unlike sulfur and selenium Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmet ...

), 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 Sodium iodide (chemical formula NaI) is an ionic compound formed from the chemical reaction of sodium metal and iodine. Under standard conditions, it is a white, water-soluble solid comprising a 1:1 mix of sodium cations (Na+) and iodide anions (I ...

References

{{Tellurium compounds Iodides Tellurium halides Tellurium compounds Chalcohalides