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Disulfur dibromide

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Disulfur dibromide
Ball-and-stick model of sulfur dibromide
Disulfur-dibromide-3D-vdW.png
  Sulfur, S
  Bromine, Br
Names
IUPAC names
Disulfur dibromide
Dibromodisulfane
Systematic IUPAC name
Bromosulfanyl thiohypobromite
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.821 Edit this at Wikidata
EC Number
  • 236-119-1
UNII
  • InChI=1S/Br2S2/c1-3-4-2
    Key: JIRDGEGGAWJQHQ-UHFFFAOYSA-N
  • S(SBr)Br
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
350.52 J/(mol·K)[2]
30.96 kJ/mol[2]
Hazards
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation markGHS09: Environmental hazard
Danger
Safety data sheet (SDS) ICSC 1661
Related compounds
Related
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]

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]
  1. ^ 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.
  2. ^ 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.
  3. ^ F. Fehér (1963). "Dibromodisulfane". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. pp. 377–378.
  4. ^ 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.