Fluorosulfite is an ion with the formula SO
2F
−. 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)3SOSO
2F] can be prepared from
Thionyl tetrafluoride, OSF4 and Me
3SiNMe
2.
Alkali metal fluorosulfites can be made by soaking the metal fluoride in liquid sulfur dioxide for a few days.
β-CsSO
2F converts to α-CsSO
2F 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 (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula ...
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 2×10
5 to 10
7 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 the ...
with
chloryl fluoride
Chloryl fluoride is the chemical compound with the formula ClO2F. It is commonly encountered as side-product in reactions of chlorine fluorides with oxygen sources. It is the acyl fluoride of chloric acid.
Preparation
ClO2F was first reported by ...
(ClO
2F) and in compounds it resembles
chlorate
The chlorate anion has the formula ClO3-. In this case, the chlorine atom is in the +5 oxidation state. "Chlorate" can also refer to chemical compounds containing this anion; chlorates are the salts of chloric acid. "Chlorate", when followed by ...
(ClO
3−).
The heat of formation from fluoride (F
−) and sulfur dioxide (SO
2) is 50 kcal mol
−1.
Reactions
Fluorosulfites can react with chlorophosphazenes to make fluorophosphazenes:
:(NPCl
2)
n + 2n KSO
2F
→ (NPF
2)
n + 2n KCl + 2nSO
2 n=3 or 4
Related
Fluorosulfite is in the category of halosulfite ions which include chlorosulfite, bromosulfite and iodosulfite. Related ions include cyanosulfite SO
2CN
−.
List
References
{{Reflist
Sulfites
Fluorine compounds