Fluoronium

The fluoronium ion is an inorganic cation with the chemical formula H
2F+
. It is one of the cations found in fluoroantimonic acid.[1] The structure of the salt with the Sb
2F−
11 anion, has been determined.[2][3] The fluoronium ion is isoelectronic with the water molecule and the azanide ion.

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 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]–)[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.[5] Recent solvolysis experiments and NMR spectroscopic studies on a metastable [C–F–C]+ fluoronium ion strongly support the divalent 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.[6]

References
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 H
    3    F+
    2    : 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 FH+
    2     and its hydrogen bonding interaction with hydrogen fluoride FH". Theoretical Chemistry Accounts: Theory, Computation, and Modeling. 31 (3): 205–214. doi:10.1007/BF00526510. S2CID 98637994.
  4. Hämmerling, Sebastian; Thiele, Günther; Steinhauer, Simon; Beckers, Helmut; Müller, Carsten; Riedel, Sebastian (2019). "A Very Strong Methylation Agent: [Me2Cl][Al(OTeF5)4]". Angewandte Chemie International Edition. 58 (29): 9807–9810. doi:10.1002/anie.201904007. ISSN 1521-3773. PMID 31050103. S2CID 143434865.
  5. 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.
  6. Hoffmann, Kurt F.; Wiesner, Anja; Müller, Carsten; Steinhauer, Simon; Beckers, Helmut; Kazim, Muhammad; Pitts, Cody Ross; Lectka, Thomas; Riedel, Sebastian (2021-09-06). "Structural proof of a [C–F–C]+ fluoronium cation". Nature Communications. 12 (1): 5275. doi:10.1038/s41467-021-25592-6. ISSN 2041-1723. PMC 8421340. PMID 34489464.
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