Selenium oxydichloride

Selenium oxydichloride

Names
IUPAC name Selenium oxychloride
Other names Seleninyl chloride
Identifiers
CAS Number	7791-23-3 Y
ChemSpider	23049 N
EC Number	232-244-0
Jmol 3D model	Interactive image
PubChem	24647
RTECS number	VS7000000
InChI InChI=1S/Cl2OSe/c1-4(2)3 N Key: LIRMPIXWGWLNND-UHFFFAOYSA-N N InChI=1/Cl2OSe/c1-4(2)3 Key: LIRMPIXWGWLNND-UHFFFAOYAX
SMILES O=[Se](Cl)Cl
Properties
Chemical formula	SeOCl2
Molar mass	165.87 g/mol
Appearance	colorless liquid
Density	2.43 g/cm3, liquid
Melting point	10.9 °C (51.6 °F; 284.0 K)
Boiling point	177.2 °C (351.0 °F; 450.3 K)
Refractive index (nD)	1.651 (20 °C)
Structure
Molecular shape	trigonal pyramidal
Vapor pressure	{{{value}}}
Related compounds
Related compounds	SOCl2, POCl3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Selenium oxydichloride is the inorganic compound with the formula SeOCl₂. It is a colorless liquid. With a high dielectric constant (55) and high specific conductance, it is an attractive solvent. Structurally, it is a close chemical relative of thionyl chloride SOCl₂, being a pyramidal molecule.

Preparation and reactions

Selenium oxydichloride can be prepared by several methods, and a popular one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:

SeO₂ + 2 HCl → Se(OH)₂Cl₂

Se(OH)₂Cl₂ → SeOCl₂ + H₂O

The original synthesis involved the redistribution reaction of selenium dioxide and selenium tetrachloride.

The compound hydrolyzes readily.

See also

• Selenium oxybromide SeOBr₂
• Selenous acid H₂SeO₃