Selenium dichloride

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Selenium dichloride
3D model (JSmol)
  • InChI=1S/Cl2Se/c1-3-2
  • Cl[Se]Cl
Molar mass 149.87 g·mol−1
Related compounds
Other anions
Selenium dibromide, SeBr2
Other cations
Sulfur dichloride, SCl2
Tellurium dichloride, TeCl2
Polonium dichloride, PoCl2
Related compounds
Selenium tetrachloride, SeCl4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Selenium dichloride is the inorganic compound with the formula SeCl2. It forms red-brown solutions in ethers. Selenium dichloride has been prepared by treating gray selenium with sulfuryl chloride. Adducts of selenium dichloride with thioethers and thioureas are well characterized. Related complexes of tellurium dichloride are known.

Structure of SeCl2(tetrahydrothiophene)2.[1]

Solutions of selenium dichloride are unstable at room temperature, forming selenium monochloride after several minutes at room temperature:[2]

3 SeCl2 → Se2Cl2 + SeCl4


  1. ^ Jolleys, A.; Levason, W.; Reid, G. (2013). "Thioether Coordination to Divalent Selenium Halide Acceptors – Synthesis, Properties and Structures". Dalton Transactions. 42 (8): 2963–2972. doi:10.1039/C2DT32665E. PMID 23250231.
  2. ^ Maaninen, Arto; Chivers, Tristram; Parvez, Masood; Pietikäinen, Jarkko; Laitinen, Risto S. (1999). "Syntheses of THF Solutions of SeX2 (X = Cl, Br) and a New Route to Selenium Sulfides SenS8−n (n = 1-5): X-Ray Crystal Structures of SeCl2(tht)2 and SeCl2·tmtu". Inorganic Chemistry. 38: 4093–4097. doi:10.1021/ic981430h.