Fluoronium

Fluoronium
Ball-and-stick model of fluoronium
Ball-and-stick model of fluoronium
Spacefill model of fluoronium
Spacefill model of fluoronium
Names
IUPAC name
Fluoronium
Systematic IUPAC name
Fluoranium
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
  • InChI=1S/FH2/h1H2/q+1 checkY
    Key: YNESUKSMQODWNS-UHFFFAOYSA-N checkY
  • InChI=1/FH2/h1H2/q+1
    Key: YNESUKSMQODWNS-UHFFFAOYAK
  • [FH2+]
Properties
H2F+
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).
checkY verify (what is checkY☒N ?)
Infobox references

The fluoronium ion is an inorganic cation with the chemical formula H
2
F+
. It is one of the cations found in fluoroantimonic acid. The structure of the salt with the Sb
2
F
11
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–+F–R, R–+F–R, or R2C=F+. In contrast to the heavier halogens, which have long been known to form open-chain halonium ions (such as [Me2Cl]+[Al(OTeF5)4]) as well as cyclic haliranium ions, fluorine was not believed to form fluoronium ions of type R–+F–R until the recent characterization of a fluoronium ion locked in a designed cage structure by Lectka and coworkers. Recent solvolysis experiments and NMR spectroscopic studies on a metastable [C–F–C]+ fluoronium ion strongly support the dicoordinated fluoronium structure over the alternative rapidly equilibrating classical carbocation. Definitive structural proof of the symmetrical [C–F–C]+ was reported by Riedel, Lectka, and coworkers by single crystal X-ray diffraction analysis. Besides its synthesis and crystallographic characterization as the [Sb2F11] salt, vibrational spectra could be recorded and a detailed analysis concerning the nature of the bonding situation in this fluoronium ion and its heavier halonium homologues was reported.


This page was last updated at 2024-04-23 14:16 UTC. Update now. View original page.

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