Selenium oxydichloride

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Selenium oxydichloride
Structure of the selenium oxydichloride molecule
3D model of the selenium oxydichloride molecule
IUPAC name
Selenium oxychloride
Other names
Seleninyl chloride
3D model (Jmol)
ECHA InfoCard 100.029.313
EC Number 232-244-0
RTECS number VS7000000
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)
trigonal pyramidal
R-phrases (outdated) 14-23/25-33-35-50/53
S-phrases (outdated) 26-36/37/39-45-60-61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
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).
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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[edit]

Selenium oxydichloride can be prepared by several methods, and a popular 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.

See also[edit]


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