Selenium dichloride

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

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.

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

3 SeCl₂ → Se₂Cl₂ + SeCl₄

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