Tellurium dichloride

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Tellurium dichloride
Tellurdichlorid.svg
Tellurium-dichloride-gas-phase-3D-bs-17.png
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
UNII
  • InChI=1S/Cl2Te/c1-3-2
    Key: VXLPBEHPTWIBJR-UHFFFAOYSA-N
  • Cl[Te]Cl
Properties
Cl2Te
Molar mass 198.50 g·mol−1
Appearanceblack solid [1]
Density 6.9 g·cm−3 [1]
Melting point 208 °C [1]
Boiling point 328 °C [1]
reacts [1]
Solubility reacts with diethyl ether, insoluble in tetrachloromethane [1]
Related compounds
Other anions
Ditellurium bromide, Te2Br
Other cations
Dichlorine monoxide, OCl2
Sulfur dichloride, SCl2
Selenium dichloride, SeCl2
Polonium dichloride, PoCl2
Related compounds
 Tritellurium dichloride, Te3Cl2
Tellurium tetrachloride, TeCl4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tellurium dichloride is a chloride of tellurium with the chemical formula TeCl2. It is a lightly characterized material that has attracted little attention.

Contents

Preparation

Tellurium dichloride is claimed as the product of the reactiong of tellurium with difluorodichloromethane. [2] [3] It can also be produced by the comproportionation of tellurium and tellurium tetrachloride. [4]

Properties

Tellurium dichloride is a black solid that reacts with water. It melts into a black liquid and vapourizes into a purple gas. [1] [5] The gas consists of monomeric TeCl2 molecules with Te–Cl bond lengths of 2.329 Å and a Cl–Te–Cl bond angle of 97.0°. [5]

Tellurium dichloride (TeCl2) is unstable with respect to disproportionation. [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).

Although tellurium dichloride is lightly studied, molecular adducts of the title compound are well characterized.

Structure of trans-[TeCl2(SC(NMe2)2)2] (H atoms omitted). Color code: green = Cl, dark gray = Te, yellow = S. ZZZEJK01.png
Structure of trans-[TeCl2(SC(NMe2)2)2] (H atoms omitted). Color code: green = Cl, dark gray = Te, yellow = S.

References

  1. 1 2 3 4 5 6 7 Perry, Dale (2011). Handbook of Inorganic Compounds. Boca Raton, FL: CRC Press. ISBN   978-1-4398-1462-8. OCLC   759865801.
  2. ↑ Gmelin, Leopold (1976). Tellurium (in English and German). Springer-Verlag. OCLC   77834357.
  3. ↑ Aynsley, E. E. (1953). "598. The preparation and properties of tellurium dichloride". Journal of the Chemical Society (Resumed). Royal Society of Chemistry (RSC): 3016. doi:10.1039/jr9530003016. ISSN   0368-1769.
  4. ↑ Haaland, Arne (2008). Molecules and models : the molecular structures of main group element compounds. Oxford New York: Oxford University Press. ISBN   978-0-19-152860-6. OCLC   226969121.
  5. 1 2 3 Fernholt, Liv; Haaland, Arne; Volden, Hans V.; Kniep, Rüdiger (1985). "The molecular structure of tellurium dichloride, TeCl2, determined by gas electron diffraction". Journal of Molecular Structure. 128 (1–3). Elsevier BV: 29–31. Bibcode:1985JMoSt.128...29F. doi: 10.1016/0022-2860(85)85037-7 . ISSN   0022-2860.
  6. ↑ Foss, O.; Maartmann-Moe, K. (1986). "Crystal and Molecular Structures of trans Square–Planar Complexes of Tellurium Dichloride, Dibromide and Diiodide with Tetramethylthiourea, TeL2X2. Bond Lengths in Centrosymmetric Tellurium(II) Complexes". Acta Chemica Scandinavica A. 40: 675. doi: 10.3891/acta.chem.scand.40a-0675 .
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