Contents

Disulfur dibromide

Disulfur dibromide

Sulfur, S   Bromine, Br
Names
IUPAC name Dibromodisulfane
Other names Bromosulfanyl thiohypobromite Disulfur dibromide
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
Boiling point	46–48 °C (115–118 °F; 319–321 K) (0.1 mmHg)
Structure
Point group	C2
Coordination geometry	2 at sulfur atoms
Molecular shape	gauche
Thermochemistry
Std molar entropy (S⦵298)	350.52 J/(mol·K)[1]
Std enthalpy of formation (ΔfH⦵298)	30.96 kJ/mol[1]
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

Chemical compound

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.^[2] The compound has no particular application, unlike the related sulfur compound disulfur dichloride.

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.^[3]

References[edit]