Chemistry:Tellurium dichloride
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3D model (JSmol)
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| 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
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Ditellurium bromide, Te 2Br |
Other cations
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Dichlorine monoxide, OCl 2 Sulfur dichloride, SCl 2 Selenium dichloride, SeCl 2 Polonium dichloride, PoCl 2 |
Related compounds
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Tritellurium dichloride, Te 3Cl 2 Tellurium tetrachloride, TeCl 4 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Tellurium dichloride is a chloride of tellurium with the chemical formula TeCl2. It is a lightly characterized material that has attracted little attention.
Preparation
Tellurium dichloride is claimed as the product of the reaction 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.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Perry, Dale (2011). Handbook of Inorganic Compounds. Boca Raton, FL: CRC Press. ISBN 978-1-4398-1462-8. OCLC 759865801.
- ↑ Gmelin, Leopold (1976) (in en, de). Tellurium. 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.
- ↑ 5.0 5.1 5.2 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 (Elsevier BV) 128 (1–3): 29–31. doi:10.1016/0022-2860(85)85037-7. ISSN 0022-2860. Bibcode: 1985JMoSt.128...29F.
- ↑ 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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