• Source: Thiothionyl fluoride

Thiothionyl fluoride is a chemical compound of fluorine and sulfur, with the chemical formula S=SF2. It is an isomer of disulfur difluoride (difluorodisulfane) F−S−S−F.




Preparation


Thiothionyl fluoride can be obtained from the reaction between disulfur dichloride with potassium fluoride at about 150 °C or with mercury(II) fluoride at 20 °C.

S2Cl2 + 2 KF → S=SF2 + 2 KCl
Another possible preparation is by the reaction of nitrogen trifluoride with sulfur.

NF3 + 3 S → S=SF2 + NSF
It also forms from disulfur difluoride when in contact with alkali metal fluorides.
S=SF2 can also be synthesized with the reaction of potassium fluorosulfite and disulfur dichloride:

2 KSO2F + S2Cl2 → S=SF2 + 2 KCl + 2 SO2




Properties


Thiothionyl fluoride is a colorless gas. At high temperatures and pressures, it decomposes into sulfur tetrafluoride and sulfur.

2 S=SF2 → SF4 + 3 S
With hydrogen fluoride, it forms sulfur tetrafluoride and hydrogen sulfide.

S=SF2 + 2 HF → SF4 + H2S
It condenses with sulfur difluoride at low temperatures to yield 1,3-difluoro-trisulfane-1,1-difluoride.

S=SF2 + SF2 → FS−S−SF3




References

Kata Kunci Pencarian:

• Kamus rumus kimia
• Thiothionyl fluoride
• Sulfur fluoride
• Thiosulfoxide
• Disulfur difluoride
• S2F2
• List of gases
• Glossary of chemical formulae
• Difluorodisulfanedifluoride