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Selenium hexasulfide - Revision history
2026-05-10T06:50:14Z
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imported>Bernardirfan: Clarification
2024-01-27T18:56:45Z
<p>Clarification</p>
<p><b>New page</b></p><div>{{chembox<br />
| Watchedfields = changed<br />
| verifiedrevid = 427848433<br />
| Name = Selenium hexasulfide<br />
| OtherNames = {{ubl|Diselenacyclooctasulfane|Diselenaoctathiocane|Diselenium hexasulfide}}<br />
| Reference = <ref name="hand"><br />
{{Citation|last = Lide|first = David R.|author-link =|year = 1998|title = Handbook of Chemistry and Physics|edition = 87|volume =|series =|location = Boca Raton, Florida|publisher = CRC Press|id =|isbn = 0-8493-0594-2|doi =|oclc =|pages = 4–81|url =}}</ref><br />
| ImageFileL1 = 1,2-Selenium hexasulfide.png<br />
| ImageCaptionL1 = 1,2-Selenium<br>hexasulfide<br />
| ImageSizeL1 = 105<!-- allotrope images have unequal widths; we want equal appearance here --><br />
| ImageFileR1 = 1,3-Selenium hexasulfide.png<br />
| ImageCaptionR1 = 1,3-Selenium<br>hexasulfide<br />
| ImageSizeR1 = 114<br />
| ImageFileL2 = 1,4-Selenium hexasulfide.png<br />
| ImageCaptionL2 = 1,4-Selenium<br>hexasulfide<br />
| ImageSizeL2 = 114<br />
| ImageFileR2 = 1,5-Selenium hexasulfide.png<br />
| ImageCaptionR2 = 1,5-Selenium<br>hexasulfide<br />
| ImageSizeR2 = 105<br />
|Section1={{Chembox Identifiers<br />
| index1_label=1,2<br />
| index5_label=1,5<br />
| CASNo_Ref = {{cascite|correct|??}}<br />
| CASNo = 75926-26-0<br />
| ChemSpiderID1 = 9296780<br />
| ChemSpiderID5 = 9057901<br />
| PubChem1 = 11121651<br />
| PubChem5 = 10882632<br />
| InChI1=1S/S6Se2/c1-2-4-6-8-7-5-3-1<br />
| InChIKey1 = GVMSZJKNEHYJTG-UHFFFAOYSA-N<br />
| SMILES1 = S1SSS[Se][Se]SS1<br />
| InChI5=1S/S6Se2/c1-3-7-5-2-6-8-4-1<br />
| InChIKey5 = XHXZYRZXIYIDIG-UHFFFAOYSA-N<br />
| SMILES5 = S1S[Se]SSS[Se]S1<br />
}}<br />
|Section2={{Chembox Properties<br />
| Formula = {{chem2|Se2S6}}<br />
| Se=2|S=6<br />
| Appearance = orange needles<br />
| Density = 2.44 g/cm<sup>3</sup><br />
| Solubility =<br />
| SolubleOther = soluble in [[carbon disulfide]]<br />
| MeltingPtC = 121.5<br />
| BoilingPt =<br />
}}<br />
|Section3={{Chembox Structure<br />
| CrystalStruct =<br />
}}<br />
|Section7={{Chembox Hazards<br />
}}<br />
}}<br />
<br />
'''Selenium hexasulfide''' is a [[chemical compound]] with the [[chemical formula]] {{chem2|Se2S6}}. Its molecular structure is an 8-membered ring, consisting of two [[selenium]] and six [[sulfur]] atoms ('''diselenacyclooctasulfane'''), analogous to the {{chem2|S8}} ring, an [[allotrope]] of sulfur ([[cyclooctasulfur]] or cyclooctasulfane), and other 8-membered rings of selenium [[sulfide]]s with formula {{chem2|Se_{''n''}S_{8−''n''}|}}.<ref name=laitinen/><br />
<br />
There are several [[isomer]]s depending on the relative placement of the selenium atoms in the ring: '''1,2-diselenacyclooctasulfane''' (with the two Se atoms adjacent), '''1,3-diselenacyclooctasulfane''', '''1,4-diselenacyclooctasulfane''', and '''1,5-diselenacyclooctasulfane''' (with the Se atoms opposite).<ref name=maan>Arto Maaninen, Tristram Chivers, Masood Parvez, Jarkko Pietikäinen, and Risto S. Laitinen (1999), "Syntheses of THF Solutions of SeX<sub>2</sub> (X = Cl, Br) and a New Route to Selenium Sulfides Se<sub>''n''</sub>S<sub>8−''n''</sub> (''n'' = 1−5): X-ray Crystal Structures of SeCl<sub>2</sub>(tht)<sub>2</sub> and SeCl<sub>2</sub>·tmtu". ''Inorganic Chemistry'', volume 38, issue 18, pages 4093–4097. {{doi|10.1021/ic981430h}}</ref> It is an oxidizing agent.<br />
<br />
The 1,2 isomer can be prepared by reaction of [[Sulfur chloride|chlorosulfanes]] and [[dichlorodiselane]] with [[potassium iodide]] in [[carbon disulfide]]. The reaction produces also [[cyclooctaselenium]] {{chem2|Se8}} and all other eight-member [[Cyclic compound|cyclic]] selenium sulfides, except selenacyclooctasulfane {{chem2|SeS7}}, and several six- and seven-membered rings.<ref name=laitinen>Risto S. Laitinen, Pentti Pekone, Yrjö Hiltunen and Tapanin A. Pakkanen (1989), "The <sup>77</sup>S NMR spestroscopic Identification of Heterocyclic Selenium Sulfides Prepared by the Reactions of Chlorosulfanes and Dichlorodiselane with Potassium Iodide". ''Acta Chemica Scandinavica'', volume 43, pages 436-440. {{doi|10.3891/acta.chem.scand.43-0436}}</ref><br />
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==References==<br />
{{reflist}}<br />
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{{Selenium compounds}}<br />
<br />
[[Category:Sulfides]]<br />
[[Category:Selenium compounds]]<br />
[[Category:Oxidizing agents]]<br />
[[Category:Interchalcogens]]<br />
<br />
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{{inorganic-compound-stub}}</div>
imported>Bernardirfan