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.
Preparation and properties
TeI is a gray solid formed by the solvothermal reaction of tellurium metal and iodine in hydroiodic or 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. The compounds are related structurally to Te2I, but the additional iodide groups do not bridge to other Te centers.The corresponding monochloride and monobromide are molecular compounds with the formula Te2X2.