1,3-Difluoro-trisulfane-1,1-difluoride

1,3-Difluoro-trisulfane-1,1-difluoride is an inorganic compound with the chemical formula S₃F₄. It has the structure F₃S−S−SF. It is a molecular compound, consisting of sulfur in valences of 2 and 4 and fluorine. The compound consists of a chain of three sulfur atoms, with three fluorine atoms bonded to the sulfur on one end and the fourth fluorine bonded to the sulfur on the other end. It has a melting point of −62 Â°C and a boiling point of 94 Â°C. As a gas, it is unstable and breaks up to form SSF₂ and SF₄.^[1]

Quick facts Names, Identifiers ...

1,3-Difluoro-trisulfane-1,1-difluoride

Names
IUPAC name (Trifluoro-λ4-sulfanyl)sulfanyl thiohypofluorite
Identifiers
CAS Number	93440-84-7
3D model (JSmol)	Interactive image
ChemSpider	128145
PubChem CID	145268
CompTox Dashboard (EPA)	DTXSID80239432
InChI InChI=1S/F4S3/c1-5-6-7(2,3)4 Key: YHBRMHFGIJPWAT-UHFFFAOYSA-N
SMILES FSSS(F)(F)F
Properties
Chemical formula	F3S−S−SF
Molar mass	172.17 g·mol−1
Melting point	−62 Â°C (−80 Â°F; 211 K)
Boiling point	94 Â°C (201 Â°F; 367 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 Â°C [77 Â°F], 100 kPa). Infobox references

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F₃S−S−SF is produced by the condensation of sulfur difluoride and an isomer of SSF₂.^[2] The reaction

S₃F₄ ⇌ SSF₂ + SF₂

uses 6 kJ/mol.^[3]

Possible isomers of its F₃S−S−SF molecular formula include FS−SF₂−SF, which has a spontaneous fluorine migration to yield F₂S^−−S−⁺SF₂, which in turn spontaneously fragments to give SF₂ and SSF₂.^[4]