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Selenium oxydichloride Structure of the selenium oxydichloride molecule 3D model of the selenium oxydichloride molecule Names IUPAC nameSelenium oxychloride
Other namesSeleninyl chloride
Identifiers CAS Number3D model (
JSmol)
ChemSpiderInChI=1S/Cl2OSe/c1-4(2)3
NKey: LIRMPIXWGWLNND-UHFFFAOYSA-N
NInChI=1/Cl2OSe/c1-4(2)3
Key: LIRMPIXWGWLNND-UHFFFAOYAX
O=[Se](Cl)Cl
(
nD)
1.651 (20 °C) Structure Molecular shape trigonal pyramidal Hazards GHS labelling:[2] Pictograms Signal word Warning Hazard statements H301, H314, H331, H373, H410 Precautionary statements P260, P261, P264, P270, P271, P273, P280, P301+P310, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P311, P314, P321, P330, P363, P391, P403+P233, P405, P501 NFPA 704 (fire diamond) 3 0 1 Lethal dose or concentration (LD, LC):LD
Lo(
lowest published)
2 mg/kg (rabbit, dermal)[1] Related compoundsRelated compounds
SOCl2, POCl3Except where otherwise noted, data are given for materials in their
standard state(at 25 °C [77 °F], 100 kPa).
N verify(
what is YN?)
Infobox referencesChemical compound
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 common one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:[3]
The original synthesis involved the redistribution reaction of selenium dioxide and selenium tetrachloride.
Pure selenium oxydichloride autoionizes to a dimer:
The SeOCl2 is generally a labile Lewis acid and solutions of sulfur trioxide in SeOCl2 likely form [SeOCl]+[SO3Cl]− the same way.
The compound hydrolyzes readily to form hydrogen chloride and selenium dioxide,[citation needed] 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.[6]
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