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Sulfur difluoride

Sulfur difluoride is an inorganic compound with the chemical formula SF<sub>2</sub>. It can be generated by the reaction of sulfur dichloride and potassium fluoride or mercury(II) fluoride at low pressures:

SCl<sub>2</sub> + 2 KF → SF<sub>2</sub> + 2 KCl
SCl<sub>2</sub> + HgF<sub>2</sub> → SF<sub>2</sub> + HgCl<sub>2</sub>

The F−S−F bond angle is 98°, and the length of S−F bond is 159 pm. The compound is highly unstable, dimerising to FSSF<sub>3</sub>. This unsymmetrical isomer of S<sub>2</sub>F<sub>4</sub> is proposed to arise via insertion of SF<sub>2</sub> into the S−F bond of a second molecule SF<sub>2</sub>:

It can also be formed from oxygen difluoride and hydrogen sulfide:

OF<sub>2</sub> + H<sub>2</sub>S → SF<sub>2</sub> + H<sub>2</sub>O

References