Thiothionyl fluoride is a

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

fluorine Fluorine is a chemical element; it has Chemical symbol, symbol F and atomic number 9. It is the lightest halogen and exists at Standard temperature and pressure, standard conditions as pale yellow Diatomic molecule, diatomic gas. Fluorine is extre ...

and

sulfur Sulfur ( American spelling and the preferred IUPAC name) or sulphur ( Commonwealth spelling) is a chemical element; it has symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms ...

, with the

chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...

. It is an

isomer In chemistry, isomers are molecules or polyatomic ions with identical molecular formula – that is, the same number of atoms of each element (chemistry), element – but distinct arrangements of atoms in space. ''Isomerism'' refers to the exi ...

disulfur difluoride 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 ...

(difluorodisulfane) .

Preparation

Thiothionyl fluoride can be obtained from the reaction between

disulfur dichloride Disulfur dichloride (or disulphur dichloride by the British English spelling) is the inorganic compound of sulfur and chlorine with the Chemical formula, formula . It is an amber oily liquid. Sometimes, this compound is incorrectly named ''sulfur ...

with

potassium fluoride Potassium fluoride is the chemical compound with the formula KF. After hydrogen fluoride, KF is the primary source of the fluoride ion for applications in manufacturing and in chemistry. It is an alkali halide salt and occurs naturally as the ...

at about 150 °C or with

mercury(II) fluoride Mercury(II) fluoride has the molecular formula HgF2 as a chemical compound of one atom of mercury with 2 atoms of fluorine. Synthesis Mercury(II) fluoride is most commonly produced by the reaction of mercury(II) oxide and hydrogen fluoride: :HgO ...

at 20 °C. : Another possible preparation is by the reaction of

nitrogen trifluoride Nitrogen trifluoride is the inorganic compound with the formula (). It is a colorless, non-flammable, toxic gas with a slightly musty odor. In contrast with ammonia, it is nonbasic. It finds increasing use within the manufacturing of flat-panel ...

with

. : It also forms from disulfur difluoride when in contact with alkali metal fluorides. can also be synthesized with the reaction of potassium fluorosulfite and disulfur dichloride: :

Properties

Thiothionyl fluoride is a colorless gas. At high temperatures and pressures, it decomposes into

sulfur tetrafluoride Sulfur tetrafluoride is a chemical compound with the formula S F4. It is a colorless corrosive gas that releases dangerous hydrogen fluoride gas upon exposure to water or moisture. Sulfur tetrafluoride is a useful reagent for the preparation o ...

and sulfur. : With

hydrogen fluoride Hydrogen fluoride (fluorane) is an Inorganic chemistry, inorganic compound with chemical formula . It is a very poisonous, colorless gas or liquid that dissolves in water to yield hydrofluoric acid. It is the principal industrial source of fluori ...

, it forms

and

hydrogen sulfide Hydrogen sulfide is a chemical compound with the formula . It is a colorless chalcogen-hydride gas, and is toxic, corrosive, and flammable. Trace amounts in ambient atmosphere have a characteristic foul odor of rotten eggs. Swedish chemist ...

. : It condenses with

sulfur difluoride Sulfur difluoride is an inorganic compound with the chemical formula SF2. It can be generated by the reaction of sulfur dichloride and potassium fluoride or mercury(II) fluoride at low pressures: :SCl2 + 2 KF → SF2 + 2 KCl :SCl2 + HgF2 → SF2 + ...

at low temperatures to yield 1,3-difluoro-trisulfane-1,1-difluoride. :{{cite journal, last1=Lösking, first1=O., last2=Willner, first2=H., last3=Baumgärtel, first3=H., last4=Jochims, first4=H. W., last5=Rühl, first5=E., title=Chalkogenfluoride in niedrigen Oxydationsstufen. X Thermochemische Daten und Photoionisations-Massenspektren von SSF2, FSSF, SF3SF und SF3SSF, journal=Zeitschrift für anorganische und allgemeine Chemie, date=November 1985, volume=530, issue=11, pages=169–177, doi=10.1002/zaac.19855301120

References

Sulfur compounds Fluorides