Selenium tetrachloride

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Selenium tetrachloride
SeCl4-from-alpha-xtal-1981-CM-3D-ellipsoids.png
TeCl4structure.jpg
IUPAC name Selenium tetrachloride
Identifiers
CAS number 10026-03-6
PubChem 66205
RTECS number VS7875000
SMILES Cl[Se](Cl)(Cl)Cl
Properties
Molecular formula SeCl4
Molar mass 220.771 g/mol
Appearance white to yellow crystals
Density 2.6 g/cm³, solid
Melting point

sublimes at 191.4°C[1]

Solubility in water decomposes in water
Structure
Crystal structure Monoclinic, mS80
Space group C12/c1, No. 15
Molecular shape Seesaw (gas phase)
Hazards
EU classification Toxic (T), Dangerous for the environment (N)
NFPA 704

NFPA 704.svg

0
3
0
 
R-phrases Template:R23/25, R33, R50/53
S-phrases Template:S20/21, S28, S45, S60, S61[2]
Flash point non-flammable
Related compounds
Other anions Selenium tetrafluoride
Selenium tetrabromide
Selenium dioxide
Other cations Dichlorine monoxide
Sulfur tetrachloride
Tellurium tetrachloride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Selenium tetrachloride, also selenious chloride, selenous chloride, or selenium(IV) chloride, is a chemical compound. Its chemical formula is SeCl4. It contains selenium in its +4 oxidation state. It also contains chloride ions.

Properties[change | change source]

Selenium tetrachloride is a yellow or white solid. It evaporates easily. It reacts with water to make hydrochloric acid and selenous acid. It reacts with selenium dioxide to make selenium oxychloride, a mixture of selenium dioxide and selenium tetrachloride bonded together.

Preparation[change | change source]

It is made by heating a mixture of selenium and chlorine. The selenium tetrachloride escapes as a gas. This can be used to purify selenium. Impure selenium can be placed in the flask, reacted with chlorine. Only selenium tetrachloride escapes. This is reduced to selenium again, making pure selenium.

Uses[change | change source]

It is used to purify selenium. It is used to make other selenium compounds.

Related pages[change | change source]

References[change | change source]

  1. Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 487. ISBN 0849305942. http://books.google.com/?id=lFjg0L-uOxoC&pg=PT872. Retrieved 2008-07-02
  2. "323527 Selenium tetrachloride". Sigma-Aldrich. http://www.sigmaaldrich.com/catalog/search/ProductDetail/ALDRICH/323527/. Retrieved 2008-07-02.