Selenium dichloride

Selenium dichloride is the inorganic compound with the formula SeCl₂. It forms red-brown solutions in ethers. Selenium dichloride has been prepared by treating gray selenium with sulfuryl chloride. Adducts of selenium dichloride with thioethers and thioureas are well characterized. Related complexes of tellurium dichloride are known.

Structure of SeCl₂(tetrahydrothiophene)₂.^[1]

Selenium dichloride

Identifiers
CAS Number	14457-70-6
3D model (JSmol)	Interactive image
ChemSpider	123257
PubChem CID	139762
UNII	PDE7WQS0XY
CompTox Dashboard (EPA)	DTXSID80162756
InChI InChI=1S/Cl2Se/c1-3-2 Key: SWAKCLHCWHYEOW-UHFFFAOYSA-N
SMILES Cl[Se]Cl
Properties
Chemical formula	Cl2Se
Molar mass	149.87 g·mol−1
Related compounds
Other anions	Selenium dibromide, SeBr2
Other cations	Sulfur dichloride, SCl2 Tellurium dichloride, TeCl2 Polonium dichloride, PoCl2
Related compounds	Selenium tetrachloride, SeCl4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Solutions of selenium dichloride are unstable at room temperature, forming selenium monochloride after several minutes at room temperature:^[2]

3 SeCl₂ → Se₂Cl₂ + SeCl₄