Tritellurium dichloride

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Tritellurium dichloride
Identifiers
3D model (
JSmol
)
  • InChI=1S/Cl2Te3/c1-5(2)4-3
    Key: TWWCHESXRMILGP-UHFFFAOYSA-N
  • Cl[Te](=[Te])(=[Te])Cl
Properties
Te3Cl2
Molar mass 453.71 g/mol
Appearance Gray solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N (what is checkY☒N ?)
Structure of trans-[TeCl2(SC(NMe2)2)2] (H atoms omitted).[1]

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-.[2] It is a semiconductor with a band gap of 1.52 eV, which is larger than that for elemental Te (0.34 eV).[3] It is prepared by heating Te with the appropriate stoichiometry of chlorine.[4]

Other lower tellurium chlorides

Te2Cl2 (ditellurium dichloride) 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.[3]

Tellurium dichloride (TeCl2) is unstable with respect to disproportionation, and has not been isolated as a solid, but has been characterised as the main component of the vapor formed with TeCl4 and hot Te.[5] Several complexes of it are known and well characterized. They are prepared by treating tellurium dioxide with hydrochloric acid in the presence of thioureas. The thiourea serves both as a ligand and as a reductant, converting Te(IV) to Te(II).

References

  1. doi:10.3891/acta.chem.scand.40a-0675
    .
  2. ISBN 978-0-08-037941-8
    .
  3. ^
    doi:10.1039/9781847557575-00455
    .
  4. doi:10.1002/zaac.19764220103
    .
  5. doi:10.1016/0022-2860(85)85037-7
    .
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