Disulfur dibromide

Disulfur dibromide
	; Sulfur, S Bromine, Br
Names
	IUPAC names Disulfur dibromide; Dibromodisulfane
	Systematic IUPAC name Bromosulfanyl thiohypobromite
Identifiers
CAS Number	13172-31-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	109902;
ECHA InfoCard	100.032.821
EC Number	236-119-1;
PubChem CID	123296;
UNII	L9DU8F2SHZ ;
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)
Std enthalpy of; formation (ΔfH⦵298)	30.96 kJ/mol
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). verify (what is ?) Infobox references

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

^ ^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.