Sulfuryl fluoride

Sulfuryl Fluoride

Sulfuryl fluoride

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Sulfuryl fluoride is the inorganic compound with the formula SO<sub>2</sub>F<sub>2</sub>. This easily condensed gas has properties more similar to sulfur hexafluoride than sulfuryl chloride, being resistant to hydrolysis even up to 150 °C. So inert is this material that suspended molten "sodium metal retains its shiny metallic appearance."

Structure and preparation

The molecule is tetrahedral with C<sub>2v</sub> symmetry. The S-O distance is 140.5 pm, S-F is 153.0 pm. As predicted by VSEPR, the O-S-O angle is more open than the F-S-F angle, 124° and 97°, respectively.

It is prepared by direct reaction of fluorine with sulfur dioxide:
SO<sub>2</sub> + F<sub>2</sub> → SO<sub>2</sub>F<sub>2</sub>

A laboratory-scale synthesis begins with the preparation of potassium fluorosulfite:
SO<sub>2</sub> + KF → KSO<sub>2</sub>F
This salt is then chlorinated to give sulfuryl chloride fluoride:
KSO<sub>2</sub>F + Cl<sub>2</sub> → SO<sub>2</sub>ClF + KCl
Further heating (180 °C) of potassium fluorosulfite with the sulfuryl...
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