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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

• See also

• References

Selenium oxydichloride can be prepared by several methods, and a common one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:cite-ref-3[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.

Pure selenium oxydichloride autoionizes to a dimer:cite-ref-footnoteaudriethkleinberg1953237-4-0[4]

SeOCl2 ↔ (SeO)2Cl+ 3 + Cl−

The SeOCl2 is generally a labile Lewis acid and solutions of sulfur trioxide in SeOCl2 likely form [SeOCl]+[SO3Cl]− the same way.cite-ref-footnoteaudriethkleinberg1953239-242-5-0[5]

The compound hydrolyzes readily to form hydrogen chloride and selenium dioxide, and very few organic compounds dissolve in it without reaction. At elevated temperatures, it is a strong oxidizer, yielding a chloride, selenium dioxide, and diselenium dichloride.cite-ref-6[6]

• Selenium oxybromide (SeOBr2)

• Selenous acid (H2SeO3)

cite-note-11. "Selenium compounds (as Se)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

cite-note-22. "Selenium oxychloride". pubchem.ncbi.nlm.nih.gov. Retrieved 12 December 2021.

cite-note-33. ↑ citerefsmithjackson1950Smith, G. B. L.; Jackson, Julius (1950). "Selenium(IV) Oxychloride". Inorganic Syntheses. Vol. 3. pp. 130–137. doi:10.1002/9780470132340.ch34. ISBN 9780470132340. {{cite book}}: ISBN / Date incompatibility (help)

cite-note-footnoteaudriethkleinberg1953237-44. ↑ Audrieth & Kleinberg 1953, p. 237.

cite-note-footnoteaudriethkleinberg1953239-242-55. ↑ Audrieth & Kleinberg 1953, pp. 239–242.

cite-note-66. ↑ citerefaudriethkleinberg1953Audrieth, Ludwig F.; Kleinberg, Jacob (1953). Non-aqueous solvents. New York: John Wiley & Sons. pp. 235–6. LCCN 52-12057.