Selenium oxydichloride

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.

Selenium oxydichloride
Structure of the selenium oxydichloride molecule
3D model of the selenium oxydichloride molecule
Names
IUPAC name
Selenium oxychloride
Other names
Seleninyl chloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.313
EC Number
  • 232-244-0
RTECS number
  • VS7000000
UNII
Properties
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)
1.651 (20 °C)
Structure
trigonal pyramidal
Hazards
R-phrases (outdated) 14-23/25-33-35-50/53
S-phrases (outdated) 26-36/37/39-45-60-61
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
0
3
1
Lethal dose or concentration (LD, LC):
2 mg/kg (rabbit, dermal)[1]
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

Preparation and reactions

Selenium oxydichloride can be prepared by several methods, and a common one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:[2]

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 to form hydrogen chloride and selenium dioxide.

See also

References
  1. "Selenium compounds (as Se)". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  2. Smith, G. B. L.; Jackson, Julius (1950). "Selenium(IV) Oxychloride". Inorganic Syntheses. Inorganic Syntheses. 3. pp. 130–137. doi:10.1002/9780470132340.ch34. ISBN 9780470132340.
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