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 Sulfur, S; Bromine, Br | |
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| Names | |
|---|---|
| IUPAC names Disulfur dibromide Dibromodisulfane | |
| Systematic IUPAC name Bromosulfanyl thiohypobromite | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.032.821 |
| EC Number |
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| UNII | |
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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 atsulfur 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 | |
Related compounds | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Disulfur dibromide is theinorganic compound with the formulaS2Br2. 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 fromdisulfur dichloride and 50% aqueoushydrobromic 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 compounddisulfur dichloride, although acidicalcoholysis is "an excellent synthesis ofalkyl bromides."[1]
The molecular structure isBr−S−S−Br, akin to that ofdisulfur dichloride (S2Cl2). According toelectron diffraction measurements, the angle between theBra−S−S andS−S−Brb planes is 84° and theBr−S−S angle is 107°. TheS−S distance is 198.0pm, circa 5.0 pm shorter than forS2Cl2.[4]
