Pentafluorosulfur hypofluorite
Pentafluorosulfur hypofluorite is an inorganic compound with the chemical formula. In standard conditions it is a colorless gas. It is an oxyfluoride of sulfur, where sulfur is in the +6 oxidation state, with a fluorine atom attached to oxygen.
Synthesis
can be made by reacting thionyl fluoride with fluorine at 200 °C with a silver difluoride catalyst.The synthesis can also be performed from fluorine and thionyl fluoride or thionyl tetrafluoride using caesium fluoride as catalyst at room temperature.
Properties
The molecular shape has five fluorine and one oxygen atom arranged around a sulfur atom in an octahedral arrangement. Another fluorine atom is attached to the oxygen in almost a straight line with the S-O connection. So the molecular formula can also be written as. The average S-F distance is 1.53 Å. The angles ∠FSF and ∠FSO are 90°.The neat 19F nuclear magnetic resonance spectrum of was reported using [Sulfur hexafluoride|] as internal standard. With this reference, a -131.5 ppm shift for the hypofluorite fluorine, a +1.75 ppm shift for Fax and a +3.64 ppm shift for the four Feq was observed. A 17.4 Hz 19F-19Feq spin coupling and a 155 Hz coupling constant was measured for 19Fax-19Feq in OSF5. No coupling was observed between the hypofluorite and the Fax.
A neat refined 19F nuclear magnetic resonance spectrum of SOF6 was recorded at -80°C. A first order quintet was observed for F-OSF5 at 183.9 ppm with a 3J coupling of 17.5 Hz. A high order AB4 system was observed for both the Feq and Fax of the OSF5 moiety. The S–Fax shift is 52.2 ppm and the S–Feq is 50.3 ppm with a measured 2J of 153.5 Hz.
Reactions
Iodide is oxidised to iodineAlkalis such as potassium hydroxide react
Alkenes react to add to a double bond, with on one carbon, and on the other.
boils at 15°C.
Thermal decomposition produces sulfur hexafluoride and oxygen.
Some reactions of result in fluorination of other molecules