Formula TeCl2 Melting point 208 °C Boiling point 328 °C | Molar mass 198.51 g/mol Density 6.9 g/cm³ | |
Tritellurium dichloride is the inorganic compound with the formula Te3Cl2. It is one of the more stable lower chlorides of tellurium.
Contents
Preparation and properties
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.
Other lower tellurium chlorides
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.