Disulfur dibromide

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
CAS Number	13172-31-1  Y
3D model (JSmol)	Interactive image
ChemSpider	109902
ECHA InfoCard	100.032.821
EC Number	236-119-1
PubChem CID	123296
UNII	L9DU8F2SHZ  Y
CompTox Dashboard (EPA)	DTXSID00157189
InChI InChI=1S/Br2S2/c1-3-4-2 Key: JIRDGEGGAWJQHQ-UHFFFAOYSA-N
SMILES S(SBr)Br
Properties
Chemical formula	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)
Solubility in water	hydrolyzes
Structure
Point group	C2
Coordination geometry	2 at sulfur atoms
Molecular shape	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:
Pictograms
Signal word	Danger
Safety data sheet (SDS)	ICSC 1661
Related compounds
Related	Sulfur dibromide Thionyl bromide Sulfuryl bromide
Related compounds	Hydrogen disulfide Disulfur difluoride Disulfur dichloride Disulfur diiodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y  verify  (what is  YN ?) Infobox references

Disulfur dibromide is the inorganic compound with the formula S ₂ Br ₂. 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 Br^a−S−S and S−S−Br^b 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

1. 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. 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.