Fluorosulfite
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Fluorosulfite is an ion with the formula SO2F. The term is also used for compounds or salts containing this group. Fluorosulfite was discovered in 1953 by F Seel and H Meier. Organic compounds with the name "fluorosulfite" contain the group -OS(O)F.


Preparation

(CH3)2N)3SOSO2F] can be prepared from Thionyl tetrafluoride, OSF4 and Me3SiNMe2. Alkali metal fluorosulfites can be made by soaking the metal fluoride in liquid
sulfur dioxide Sulfur dioxide (IUPAC-recommended spelling) or sulphur dioxide (traditional Commonwealth English) is the chemical compound with the formula . It is a colorless gas with a pungent smell that is responsible for the odor of burnt matches. It is r ...
for a few days. β-CsSO2F converts to α-CsSO2F when heated to 110 °C for a couple of days but remains stable below 50 °C.


Properties

The fluorosulfite ion is tetrahedral, with
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 ...
at the top. The oxygen to sulfur bonds are 147.8  pm and the fluorine to sulfur bond is >169.0 pm long. In solid ionic fluorosulfites, the ion is not fixed in orientation and continuously turns around resulting in dynamic disorder. At room temperature this turning rate is from 2×105 to 107 Hz. When cooled the rate of rotation slows, and can be frozen in place, resulting in static disorder. Fluorosulfite is
isoelectronic Isoelectronicity is a phenomenon observed when two or more molecules have the same structure (positions and connectivities among atoms) and the same electronic configurations, but differ by what specific elements are at certain locations in th ...
with
chloryl fluoride Chloryl fluoride is the chemical compound with the formula . This compound is a gas boiling at −6 °C. It is commonly encountered as side-product in reactions of chlorine fluorides with oxygen sources. It is the acyl fluoride of chloric ac ...
(ClO2F) and in compounds it resembles
chlorate Chlorate is the common name of the anion, whose chlorine atom is in the +5 oxidation state. The term can also refer to chemical compounds containing this anion, with Chlorate#Compounds (salts), chlorates being the salt (chemistry), salts of chlo ...
(ClO3). The heat of formation from fluoride (F) and sulfur dioxide (SO2) is 50 kcal mol−1.


Reactions

Fluorosulfites can react with chlorophosphazenes to make fluorophosphazenes: :(NPCl2)n + 2n KSO2F (NPF2)n + 2n KCl + 2nSO2 n=3 or 4


Related

Fluorosulfite is in the category of halosulfite ions which include chlorosulfite, bromosulfite and iodosulfite. Related ions include cyanosulfite SO2CN.


List


References

{{Sulfites Sulfites Fluorine compounds