Percobaltate

Template:Chembox Disulfur difluoride is a halide of sulfur, with the chemical formula S₂F₂.

Structure

Disulfur difluoride will undergo intramolecular rearrangement with the existence of alkali elements' fluorides, obtaining the isomer S=SF₂:

$\mathrm{F}\mathrm{S}\mathrm{-}\mathrm{S}\mathrm{F}\stackrel{KF}{\to }\mathrm{S}=\mathrm{S}{\mathrm{F}}_{\mathrm{2}}$

Synthesis

Silver(II) fluoride can fluorinate sulfur in a strictly dry container, and the reaction produces FS-SF:

${\mathrm{S}}_{\mathrm{8}}+\mathrm{8}\mathrm{A}\mathrm{g}{\mathrm{F}}_{\mathrm{2}}\stackrel{398K}{\to }\mathrm{4}{\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}+\mathrm{8}\mathrm{A}\mathrm{g}\mathrm{F}$

S=SF₂ can be synthesized with the reaction of potassium fluorosulfite and disulfur dichloride:

$\mathrm{2}\mathrm{K}\mathrm{S}{\mathrm{O}}_{\mathrm{2}}\mathrm{F}+{\mathrm{S}}_{\mathrm{2}}\mathrm{C}{\mathrm{l}}_{\mathrm{2}}\mathrm{\to }\mathrm{S}=\mathrm{S}{\mathrm{F}}_{\mathrm{2}}+\mathrm{2}\mathrm{K}\mathrm{C}\mathrm{l}+\mathrm{2}\mathrm{S}{\mathrm{O}}_{\mathrm{2}}$

Reactions

• Decomposing to sulfur tetrafluoride and sulfur when heated:

$\mathrm{2}{\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}\stackrel{180^{o}C}{\to }\mathrm{S}{\mathrm{F}}_{\mathrm{4}}+\mathrm{3}\mathrm{S}$

• Treated with water:

$\mathrm{2}{\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}+\mathrm{2}{\mathrm{H}}_{\mathrm{2}}\mathrm{O}\stackrel{}{\to }\mathrm{S}{\mathrm{O}}_{\mathrm{2}}+\mathrm{3}\mathrm{S}+\mathrm{4}\mathrm{H}\mathrm{F}$

• Reacting with sulfuric acid:

${\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}+\mathrm{3}{\mathrm{H}}_{\mathrm{2}}\mathrm{S}{\mathrm{O}}_{\mathrm{4}}\stackrel{80^{o}C}{\to }\mathrm{5}\mathrm{S}{\mathrm{O}}_{\mathrm{2}}+\mathrm{2}\mathrm{H}\mathrm{F}+\mathrm{2}{\mathrm{H}}_{\mathrm{2}}\mathrm{O}$

• Reacting with sodium hydroxide:

$\mathrm{2}{\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}+\mathrm{6}\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}\stackrel{}{\to }\mathrm{N}{\mathrm{a}}_{\mathrm{2}}\mathrm{S}{\mathrm{O}}_{\mathrm{3}}+\mathrm{3}\mathrm{S}+\mathrm{4}\mathrm{N}\mathrm{a}\mathrm{F}+\mathrm{3}{\mathrm{H}}_{\mathrm{2}}\mathrm{O}$

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

$\mathrm{2}{\mathrm{S}}_{\mathrm{2}}{\mathrm{F}}_{\mathrm{2}}+\mathrm{5}{\mathrm{O}}_{\mathrm{2}}\stackrel{N{O}_2}{\to }\mathrm{S}\mathrm{O}{\mathrm{F}}_{\mathrm{4}}+\mathrm{3}\mathrm{S}{\mathrm{O}}_{\mathrm{3}}$

References

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