Selenium Oxydichloride

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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
CAS Number
  • 7791-23-3 ☑Y
3D model (JSmol)
  • Interactive image
ChemSpider
  • 23049 ☑Y
EC Number
  • 232-244-0
PubChem CID
  • 24647
RTECS number
  • VS7000000
UNII
  • 1G57T5401W ☑Y
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
Hazards
GHS pictograms GHS05: CorrosiveGHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
GHS Signal word Warning
GHS hazard statements
 H301, H314, H331, H373, H410
GHS precautionary statements
 P260, P261, P264, P270, P271, P273, P280, P301+310, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P311, P314, P321, P330, P363, P391, P403+233, P405, P501
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 codeNFPA 704 four-colored diamond
0
3
1
Lethal dose or concentration (LD, LC):
LDLo (lowest published)
 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).
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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 common one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:[3]

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

  • Selenium oxybromide SeOBr2
  • Selenous acid H2SeO3

References

  1. ↑ "Selenium compounds (as Se)". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/7782492.html. 
  2. ↑ "Selenium oxychloride" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/24647#section=Safety-and-Hazards. 
  3. ↑ 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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Categories: [Oxychlorides] [Inorganic solvents]

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