Disulfur difluoride
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Names | |||
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IUPAC name fluorosulfanyl thiohypofluorite | |||
Other names Difluorodisulfane[1] | |||
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Properties | |||
Chemical formula | S2F2 | ||
Molar mass | 102.127 g/mol | ||
Melting point | −133 °C (−207 °F; 140 K) | ||
Boiling point | 15 °C (59 °F; 288 K) | ||
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Disulfur difluoride is an inorganic compound with the chemical formula S2F2. It is a halide of sulfur.
Structure
Disulfur difluoride has a chain structure F−S−S−F. The angle between the Fa−S−S and S−S−Fb planes is 87.9°, while the angles of Fa−S−S and S−S−Fb are equivalent, and are equal to 108.3°. Both S−F bonds are equivalent and their length is 163.5 pm, while the length of the S−S bond is 189 pm. This structure is referred to as gauche, and is similar to H2O2.
There is a branched isomer of disulfur difluoride, thiothionyl fluoride, with the structure S=SF2.
Synthesis
Silver(II) fluoride can fluorinate sulfur in a strictly dry container at 125 °C (257 °F; 398 K), and the reaction produces FS−SF:[2]
- S8 + 8 AgF2 → 4 S2F2 + 8 AgF
Reactions
Disulfur difluoride undergoes intramolecular rearrangement in the presence of fluorides of alkali metals, yielding the isomer S=SF2:[3]
- FS−SF → S=SF2
- Decomposing to sulfur tetrafluoride and sulfur when heated to 180 °C:
- 2 S2F2 → SF4 + 3 S
- 2 S2F2 + 2 H2O → SO2 + 3 S + 4 HF
- Reacting with sulfuric acid at 80 °C:
- S2F2 + 3 H2SO4 → 5 SO2 + 2 HF + 2 H2O
- Reacting with sodium hydroxide:
- 2 S2F2 + 6 NaOH → Na2SO3 + 3 S + 4 NaF + 3 H2O
- Reacting with oxygen at high pressure, using nitrogen dioxide as a catalyst:
- 2 S2F2 + 5 O2 → SOF4 + 3 SO3[4][5][6]
References
- ^ "Difluorodisulfane".
- ^ Davis, R.Wellington; Firth, Steven (1991). "The microwave spectrum of the chain isomer of disulfur difluoride: FS-SF". Journal of Molecular Spectroscopy. 145 (2): 225. doi:10.1016/0022-2852(91)90109-N.
- ^ Davis, R.Wellington (1986). "The microwave spectrum of the pyramidal isomer of disulfur difluoride: S=SF2". Journal of Molecular Spectroscopy. 116 (2): 371–383. doi:10.1016/0022-2852(86)90134-7.
- ^ Справочник химика / Редкол.: Никольский Б.П. и др.. — 3-е изд., испр. — Л.: Химия, 1971. — Т. 2. — 1168 с. (in Russian)
- ^ Химическая энциклопедия / Редкол.: Кнунянц И.Л. и др.. — М.: Советская энциклопедия, 1995. — Т. 4. — 639 с. — ISBN 978-5-85270-092-6 (in Russian)
- ^ Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов. — 3-е изд., испр. — М.: Химия, 2000. — 480 с. — ISBN 978-5-7245-1163-6 (in Russian)
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2) and polysulfides
H2S2 | He | ||||||||||||||||||||
Li | Be | B | RS2R' | N | S2O | S2F2 | Ne | ||||||||||||||
Na2Sx | Mg | Al | Si | P | S3 | S2Cl2 | Ar | ||||||||||||||
K | Ca | Sc | TiS3 | VS4 | Cr | MnS2 | FeS2 | CoS2 | NiS2 | "CuS" | Zn | Ga | Ge | As | Se | S2Br2 | Kr | ||||
Rb | Sr | Y | Zr | Nb | Mo | Tc | RuS2 | Rh | Pd | Ag | Cd | In | Sn | Sb2S5? | Te | S2I2 | Xe | ||||
Cs | Ba | * | Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn | |||
Fr | Ra | ** | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |||
* | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | |||||||
** | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No |