Tellurium dichloride

Tritellurium dichloride

Identifiers
CAS Number	12526-08-8 N
Properties
Chemical formula	Te3Cl2
Molar mass	453.71 g/mol
Hazards
EU classification (DSD) (outdated)	not listed
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N (what is YN ?)
Infobox references

Tritellurium dichloride is the inorganic compound with the formula Te₃Cl₂. It is one of the more stable lower chlorides of tellurium.

Te₃Cl₂ is a gray solid. Its structure consists of a long chain of Te atoms, with every third Te center carrying two chloride ligands for the repeat unit -Te-Te-TeCl₂-. It is a semiconductor with a band gap of 1.52 eV, which is larger than that for elemental Te (0.34 eV). It is prepared by heating Te with the appropriate stoichiometry of chlorine.

Te₂Cl₂ is a yellow liquid prepared by reaction of lithium polytellurides with TeCl₄. Te₂Cl, also a polymer, is a metastable gray solid, tending to convert to Te₃Cl₂ and TeCl₄. Being unstable with respect to disproportionation, tellurium dichloride has not been isolated as a solid, but has been characterised as the main component of the vapor formed with TeCl₄ and hot Te.