Selenium tetrachloride

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Selenium tetrachloride
IUPAC name
Selenium tetrachloride
3D model (JSmol)
ECHA InfoCard 100.030.036
RTECS number
  • VS7875000
  • Cl[Se](Cl)(Cl)Cl
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]
decomposes in water
Monoclinic, mS80
C12/c1, No. 15
Seesaw (gas phase)
EU classification Toxic (T), Dangerous for the environment (N)
NFPA 704

NFPA 704.svg

R-phrases R23/25, R33, R50/53
S-phrases 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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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. p. 487. ISBN 0849305942. Retrieved 2008-07-02.
  2. "323527 Selenium tetrachloride". Sigma-Aldrich. Retrieved 2008-07-02.[permanent dead link]