Selenium monochloride

chemical compound

Selenium monochloride, also known as selenium(I) chloride or diselenium dichloride, is a chemical compound. Its chemical formula is Se2Cl2. It contains selenium in its +1 oxidation state. It also contains chloride ions.

Selenium monochloride
IUPAC name
Selenium monochloride
Other names
Dichlorodiselenide, Diselenium dichloride, Selenium chloride, 1,2-dichlorodiselane
ECHA InfoCard 100.030.022
PubChem {{{value}}}
Molar mass 228.83 g/mol
Appearance Reddish-brown oily liquid
Density 2.7741 g/cm3
Melting point -85 °C (223.15 K)
Boiling point 127 °C at 0.997 atm (400.15 K at 0.997 atm)
insoluble; sol in CHCl3, CS2, MeCN
Solubility Soluble in dry chloroform and carbon disulfide
R-phrases 23/24/25-34
S-phrases 22-26-36/37/39-45
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


It is a reddish brown oily liquid.


It can be made by reacting selenium, selenium dioxide, and hydrochloric acid. It can be made though by just reacting chlorine with selenium. Another way to make it is reacting oleum and hydrochloric acid with selenium.


It can be used to add selenium to other chemical compounds.

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