Disulfur dibromide is the inorganic compound with the formula S2Br2. It is a yellow-brown liquid that fumes in air. It is prepared by direct combination of the elements and purified by vacuum distillation.[3] Higher yields can be obtained from disulfur dichloride and 50% aqueous hydrobromic acid, but the product must be promptly removed from water, lest it hydrolyze.[1] The compound has no particular application,[citation needed] unlike the related sulfur compound disulfur dichloride, although acidic alcoholysis is "an excellent synthesis of alkyl bromides."[1]
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 Sulfur, S Bromine, Br | |
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| Names | |
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| IUPAC names
Disulfur dibromide
Dibromodisulfane | |
| Systematic IUPAC name
Bromosulfanyl thiohypobromite | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.032.821 |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| S2Br2 | |
| Molar mass | 223.93 g·mol−1 |
| Appearance | Orange/yellow liquid |
| Density | 2.703 g/cm3 |
| Melting point | −46 °C (−51 °F; 227 K)[1] |
| Boiling point | 46–48 °C (115–118 °F; 319–321 K) (0.1 mmHg) |
| hydrolyzes | |
| Structure | |
| C2 | |
| 2 at sulfur atoms | |
| gauche | |
| Thermochemistry | |
Std molar
entropy (S⦵298) |
350.52 J/(mol·K)[2] |
Std enthalpy of
formation (ΔfH⦵298) |
30.96 kJ/mol[2] |
| Hazards | |
| GHS labelling: | |
  
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| Danger | |
| Safety data sheet (SDS) | ICSC 1661 |
| Related compounds | |
Related
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Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The molecular structure is Br−S−S−Br, akin to that of disulfur dichloride (S2Cl2). According to electron diffraction measurements, the angle between the Bra−S−S and S−S−Brb planes is 84° and the Br−S−S angle is 107°. The S−S distance is 198.0 pm, circa 5.0 pm shorter than for S2Cl2.[4]
References
edit- ^ a b c Magee, Philip S. (1971). "The Sulfur–Bromine Bond". In Senning, Alexander (ed.). Sulfur in Organic and Inorganic Chemistry. Vol. 1. New York: Marcel Dekker. pp. 264–267. ISBN 0-8247-1615-9. LCCN 70-154612.
- ^ a b Thermodynamic Properties of Inorganic Materials · Pure Substances. Part 2 _ Compounds from BeBr_g to ZrCl2_g. Springer-Verlag Berlin Heidelberg. 1999. p. 99. ISBN 978-3-540-49411-9.
- ^ F. Fehér (1963). "Dibromodisulfane". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. pp. 377–378.
- ^ Zysman-Colman, Eli; Harpp, David (2004). "Comparison of the Structural Properties of Compounds Containing the XSSX Moiety (X = H, Me, R, Cl, Br, F, OR)". Journal of Sulfur Chemistry. 25 (4): 291-316. doi:10.1080/17415990410001710163. S2CID 95468251.