Selenium oxydichloride
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| Template:Longitem | SeOCl2 |
| Molar mass | 165.87 g/mol |
| Appearance | colorless liquid |
| Density | 2.43 g/cm3, liquid |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Template:Longitem | 1.651 (20 °C) |
| Template:Longitem | trigonal pyramidal |
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| Template:Longitem | SOCl2, POCl3 |
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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
Selenium oxydichloride can be prepared by several methods, and a common 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.
Pure selenium oxydichloride autoionizes to a dimer:Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
- SeOCl2 ↔ (SeO)2ClScript error: No such module "Su". + Cl−
The SeOCl2 is generally a labile Lewis acid and solutions of sulfur trioxide in SeOCl2 likely form [SeOCl]+[SO3Cl]− the same way.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
The compound hydrolyzes readily to form hydrogen chloride and selenium dioxide,Script error: No such module "Unsubst". 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.[3]
See also
- Selenium oxybromide SeOBr2
- Selenous acid H2SeO3
References
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