Tellurium dichloride
From Wikipedia the free encyclopedia
 | |
 | |
| Identifiers | |
|---|---|
3D model (JSmol) | |
| ChemSpider | |
PubChem CID | |
| UNII | |
CompTox Dashboard (EPA) | |
| |
| |
| Properties | |
| Cl2Te | |
| Molar mass | 198.50 g·mol−1 |
| Appearance | black 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.
Preparation
[edit]Tellurium dichloride can be produced by reacting tellurium with difluorodichloromethane.[2][3]
It can also be produced by the comproportionation of tellurium and tellurium tetrachloride.[4]
Properties
[edit]Tellurium dichloride is a black solid that reacts with water. It will melt into a black liquid and vapourize 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).
Reactions
[edit]Tellurium dichloride reacts with barium chloride in water to form barium tellurite.[6]
References
[edit]- ^ a b c d e f g Perry, Dale (2011). Handbook of Inorganic Compounds. Boca Raton, FL: CRC Press. ISBN 978-1-4398-1462-8. OCLC 759865801.
- ^ Gmelin, Leopold (1976). Tellurium (in English and German). Springer-Verlag. OCLC 77834357.
- ^ 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.
- ^ 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.
- ^ a b c 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.
- ^ Ropp, Richard C. (2012-12-31). Encyclopedia of the Alkaline Earth Compounds. Newnes. p. 193. ISBN 978-0-444-59553-9.