Selenium hexasulfide

Selenium hexasulfide^[1]
1,2-Selenium; hexasulfide	1,3-Selenium; hexasulfide
1,4-Selenium; hexasulfide	1,5-Selenium; hexasulfide
Names
	Other names Diselenacyclooctasulfane; Diselenaoctathiocane; Diselenium hexasulfide;
Identifiers
CAS Number	75926-26-0 ;
3D model (JSmol)	1,2: Interactive image; 1,5: Interactive image;
ChemSpider	1,2: 9296780; 1,5: 9057901;
PubChem CID	1,2: 11121651; 1,5: 10882632;
	InChI 1,2: InChI=1S/S6Se2/c1-2-4-6-8-7-5-3-1 Key: GVMSZJKNEHYJTG-UHFFFAOYSA-N; 1,5: InChI=1S/S6Se2/c1-3-7-5-2-6-8-4-1 Key: XHXZYRZXIYIDIG-UHFFFAOYSA-N;
	SMILES 1,2: S1SSS[Se][Se]SS1; 1,5: S1S[Se]SSS[Se]S1;
Properties
Chemical formula	Se2S6
Molar mass	350.30 g·mol−1
Appearance	orange needles
Density	2.44 g/cm3
Melting point	121.5 °C (250.7 °F; 394.6 K)
Solubility	soluble in carbon disulfide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Selenium hexasulfide is a chemical compound with the chemical formula Se₂S₆. Its molecular structure is an 8-membered ring, consisting of two selenium and six sulfur atoms (diselenacyclooctasulfane), analogous to the S₈ ring, an allotrope of sulfur (cyclooctasulfur or cyclooctasulfane), and other 8-membered rings of selenium sulfides with formula Se_nS_8−n.^[2]

There are several isomers 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).^[3] It is an oxidizing agent.

The 1,2 isomer can be prepared by reaction of chlorosulfanes and dichlorodiselane with potassium iodide in carbon disulfide. The reaction produces also cyclooctaselenium Se₈ and all other eight-member cyclic selenium sulfides, except selenacyclooctasulfane SeS₇, and several six- and seven-membered rings.^[2]

References

^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–81, ISBN 0-8493-0594-2
^ ^a ^b Risto S. Laitinen, Pentti Pekone, Yrjö Hiltunen and Tapanin A. Pakkanen (1989), "The ⁷⁷S 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
^ Arto Maaninen, Tristram Chivers, Masood Parvez, Jarkko Pietikäinen, and Risto S. Laitinen (1999), "Syntheses of THF Solutions of SeX₂ (X = Cl, Br) and a New Route to Selenium Sulfides Se_nS_8−n (n = 1−5): X-ray Crystal Structures of SeCl₂(tht)₂ and SeCl₂·tmtu". Inorganic Chemistry, volume 38, issue 18, pages 4093–4097. doi:10.1021/ic981430h

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[hand-1] Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–81, ISBN 0-8493-0594-2

[laitinen-2] Risto S. Laitinen, Pentti Pekone, Yrjö Hiltunen and Tapanin A. Pakkanen (1989), "The ⁷⁷S 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

[maan-3] Arto Maaninen, Tristram Chivers, Masood Parvez, Jarkko Pietikäinen, and Risto S. Laitinen (1999), "Syntheses of THF Solutions of SeX₂ (X = Cl, Br) and a New Route to Selenium Sulfides Se_nS_8−n (n = 1−5): X-ray Crystal Structures of SeCl₂(tht)₂ and SeCl₂·tmtu". Inorganic Chemistry, volume 38, issue 18, pages 4093–4097. doi:10.1021/ic981430h

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