Disulfur difluoride explained

Disulfur difluoride is an inorganic compound with the chemical formula . It is a halide of sulfur.

Structure

Disulfur difluoride has a chain structure . The angle between the and planes is 87.9°, while the angles of and are equivalent, and are equal to 108.3°. Both bonds are equivalent and their length is 163.5 pm, while the length of the bond is 189 pm. This structure is referred to as gauche, and is similar to .

There is a branched isomer of disulfur difluoride, thiothionyl fluoride, with the structure .

Synthesis

Silver(II) fluoride can fluorinate sulfur in a strictly dry container at, and the reaction produces :^[1]

Reactions

Disulfur difluoride undergoes intramolecular rearrangement in the presence of fluorides of alkali metals, yielding the isomer S=SF₂:^[2]

• Decomposing to sulfur tetrafluoride and sulfur when heated to 180 °C:

• Hydrolysis:

• Reacting with sulfuric acid at 80 °C:

• Reacting with sodium hydroxide:

• Reacting with oxygen at high pressure, using nitrogen dioxide as a catalyst:

^{[3] [4] [5]}

Notes and References

1. 10.1016/0022-2852(91)90109-N. The microwave spectrum of the chain isomer of disulfur difluoride: FS-SF. 1991. Davis. R.Wellington. Firth. Steven. Journal of Molecular Spectroscopy. 145. 2. 225.
2. 10.1016/0022-2852(86)90134-7. The microwave spectrum of the pyramidal isomer of disulfur difluoride: S=SF2. 1986. Davis. R.Wellington. Journal of Molecular Spectroscopy. 116. 2. 371–383.
3. Справочник химика / Редкол.: Никольский Б.П. и др.. — 3-е изд., испр. — Л.: Химия, 1971. — Т. 2. — 1168 с.
4. Химическая энциклопедия / Редкол.: Кнунянц И.Л. и др.. — М.: Советская энциклопедия, 1995. — Т. 4. — 639 с. —
5. Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов. — 3-е изд., испр. — М.: Химия, 2000. — 480 с. —