Tritellurium dichloride

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Tritellurium dichloride
Identifiers
CAS number 12526-08-8 N
Properties
Molecular formula Te3Cl2
Molar mass 453.71 g/mol
Hazards
EU classification not listed
 N
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

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

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-.[1] It is a semiconductor with a band gap of 1.52 eV, which is larger than that for elemental Te (0.34 eV).[2] It is prepared by heating Te with the appropriate stoichiometry of chlorine.[3]

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.[2] 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.[4]

References

  1. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419. 
  2. ↑ 2.0 2.1 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
  3. ↑ 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
  4. ↑ Liv Fernholt, Arne Haaland , Hans V. Volden, Rüdiger Kniep "The molecular structure of tellurium dichloride, TeCl2, determined by gas electron diffraction" Journal of Molecular Structure 1985, volume 128, pages 29-31.doi:10.1016/0022-2860(85)85037-7
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