Tellurium iodide

Tellurium iodide
Identifiers
CAS Number	12600-42-9;
Properties
Chemical formula	TeI
Appearance	gray solid
Hazards
EU classification (DSD) (outdated)	not listed
Related compounds
Other anions	ditellurium bromide
Other cations	selenium monochloride
Related compounds	tellurium tetraiodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Tellurium iodide is an inorganic compound 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.[1]

Preparation and properties

TeI is a gray solid formed by the hydrothermal reaction of tellurium metal and iodine 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.[2] 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.[1]

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.[3]

Structure of TeI₂(thiourea)₂.[4]

References

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 doi:10.1039/9781847557575-00455
R. Kniep, D. Mootz, A. Rabenau "Zur Kenntnis der Subhalogenide des Tellurs" Zeitschrift für anorganische und allgemeine Chemie 1976, Volume 422, pages 17–38. doi:10.1002/zaac.19764220103
Foss, Olav; Hauge, Sverre (1961). "Complexes of Divalent Tellurium with Thiourea". Acta Chemica Scandinavica. 15: 1615–1616. doi:10.3891/acta.chem.scand.15-1615.CS1 maint: uses authors parameter (link)
Foss, Olav; Maartmann-Moe, Knut (1987). "Complexes of Tellurium Dichloride, Dibromide and Diiodide with Thiourea and Tetramethylselenourea, TeL₂X₂. X-Ray Crystal Structures". Acta Chemica Scandinavica. 41a: 121–129. doi:10.3891/acta.chem.scand.41a-0121.CS1 maint: uses authors parameter (link)

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[Xu-1] 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 doi:10.1039/9781847557575-00455

[2] R. Kniep, D. Mootz, A. Rabenau "Zur Kenntnis der Subhalogenide des Tellurs" Zeitschrift für anorganische und allgemeine Chemie 1976, Volume 422, pages 17–38. doi:10.1002/zaac.19764220103

[3] Foss, Olav; Hauge, Sverre (1961). "Complexes of Divalent Tellurium with Thiourea". Acta Chemica Scandinavica. 15: 1615–1616. doi:10.3891/acta.chem.scand.15-1615.CS1 maint: uses authors parameter (link)

[4] Foss, Olav; Maartmann-Moe, Knut (1987). "Complexes of Tellurium Dichloride, Dibromide and Diiodide with Thiourea and Tetramethylselenourea, TeL₂X₂. X-Ray Crystal Structures". Acta Chemica Scandinavica. 41a: 121–129. doi:10.3891/acta.chem.scand.41a-0121.CS1 maint: uses authors parameter (link)