Tellurium monoiodide

Tellurium iodide is an inorganic compound with the formula TeI. 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.^[2]

Tellurium iodide

Identifiers
CAS Number	12600-42-9 Y
3D model (JSmol)	Interactive image
ChemSpider	103867644 TeI2: 9146156
PubChem CID	92025674 TeI2: 10970946
InChI InChI=1S/ITe/c1-2 Key: PNRYLQGKCSQOGH-UHFFFAOYSA-N
SMILES [Te]I
Properties
Chemical formula	TeI
Appearance	gray solid
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H332
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P312, P304+P340, P312, P322, P330, P363, P501
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

Preparation and properties

TeI is a gray solid formed by the solvothermal reaction of tellurium metal and iodine in hydroiodic^[3] or chloroaluminic acid.^[4] 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.^[3] 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.^[2]

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.^[5]

Structure of TeI₂(thiourea)₂.^[6]