|Systematic IUPAC name
3D model (JSmol)
|Molar mass||21.01374 g mol-1|
|Conjugate base||Hydrogen fluoride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
The fluoronium ion is an inorganic cation with the chemical formula . It is one of the cations found in fluoroantimonic acid. The structure of the salt with the anion, has been determined. The fluoronium ion is isoelectronic with the water molecule and the azanide ion.
The term can also refer to organyl substituted species of type H--R, R--R, or R2C=F+. In contrast to the heavier halogens, which have long been known to form open-chain halonium ions (such as ) as well as cyclic haliranium ions, fluorine was not believed to form fluoronium ions of type R--R until the recent characterization of a fluoronium ion locked in a designed cage structure by Lectka and coworkers.