Selenium tetrachloride

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

Selenium tetrachloride

Names
IUPAC name Selenium tetrachloride
Identifiers
CAS Number	10026-03-6 Y
3D model (JSmol)	Interactive image
ChemSpider	59590 Y
ECHA InfoCard	100.030.036
PubChem CID	66205
RTECS number	VS7875000
CompTox Dashboard (EPA)	DTXSID6064903
SMILES Cl[Se](Cl)(Cl)Cl
Properties
Chemical 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	0 3 0
R-phrases	R23/25, R33, R50/53
S-phrases	S20/21, S28, S45, S60, S61[2]
Flash point	non-flammable
Related compounds
Other anions	{{{value}}}
Other cations	{{{value}}}
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

Properties

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

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

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

Related pages

• Selenium monochloride
• Selenium tetrafluoride