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Ball-and-stick model of fluoronium
Spacefill model of fluoronium
IUPAC name
Systematic IUPAC name
  • 12206-67-6 ?N
3D model (JSmol)
  • InChI=1S/FH2/h1H2/q+1 checkY
  • InChI=1/FH2/h1H2/q+1
  • [FH2+]
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 . It is one of the cations found in fluoroantimonic acid.[1] The structure of the salt with the anion, has been determined.[2][3] 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.[4]


A Cs-symmetrical fluoronium ion characterized by Lectka and coworkers
  1. ^ Esteves, Pierre M.; Ramírez-Solís, Alejandro; Mota, Claudio J. A. (March 2002). "The Nature of Superacid Electrophilic Species in HF/SbF5: A Density Functional Theory Study". Journal of the American Chemical Society. 124 (11): 2672-2677. doi:10.1021/ja011151k. ISSN 0002-7863. PMID 11890818.
  2. ^ Mootz, Dietrich; Bartmann, Klemens (1988). "The Fluoronium Ions H2F+ and : Characterization by Crystal Structure Analysis". Angewandte Chemie. 27 (3): 391-392. doi:10.1002/anie.198803911.
  3. ^ Diercksen, G. H. F.; von Niessen, W.; Kraemer, W. P. (1973). "SCF LCGO MO studies on the fluoronium ion and its hydrogen bonding interaction with hydrogen fluoride FH". Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta). 31 (3): 205-214. doi:10.1007/BF00526510. S2CID 98637994.
  4. ^ Pitts, Cody Ross; Holl, Maxwell Gargiulo; Lectka, Thomas (2018-02-12). "Spectroscopic Characterization of a [C-F-C]+ Fluoronium Ion in Solution". Angewandte Chemie International Edition. 57 (7): 1924-1927. doi:10.1002/anie.201712021. PMID 29316122.

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