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^Y

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).

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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]

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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

v t e Selenium compounds
Se(−II)	Se²⁻ H₂Se Al₂Se₃ Sb₂Se₃ As₂Se₃ Bi₂Se₃ CdSe CaSe CSe₂ OCSe CrSe CoSe CuSe (CH₃)₂Se GaSe Ga₂Se₃ GeSe In₂Se₃ FeSe PbSe MgSe MnSe MnSe₂ HgSe MoSe₂ NiSe NbSe₂ NbSe₃ P_xSe_y PuSe ReSe₂ Sm₂Se₃ Ag₂Se Na₂Se SnSe TiSe₂ WSe₂ USe₂ ZnSe
Se(0,I)	Se₃S₅
Se(I)	Se₂S₆ Se₂Cl₂ C₃H₇NO₂Se
Se(II)	SeBr₂ SeCl₂ SeS₂
Se(IV)	SeO2−3 SeBr₄ SeCl₄ SeF₄ SeO₂ SeS₂ SeOBr₂ SeOCl₂ H₂SeO₃
Se(VI)	SeO2−4 SeF₆ SeO₃ SeO₂F₂ H₂SeO₄
Se(IV,VI)	SeO2−4 + SeO2−3

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