Article · Wikipedia archive · Last revised Jul 17, 2026

Fluoroanion

In chemistry, a fluoroanion or fluorometallate anion is a polyatomic anion that contains one or more fluorine atoms. The ions and salts form from them are also known as complex fluorides. They can occur in salts, or in solution, but seldom as pure acids. Fluoroanions often contain elements in higher oxidation states. They mostly can be considered as fluorometallates, which are a subclass of halometallates. However some fluoroanions contain non-metals.

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Fluoroanion
source ↗
Hexafluoroaluminate
Identifiers
ChEBI
Related compounds
Other anions
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

In chemistry, a fluoroanion or fluorometallate anion is a polyatomic anion that contains one or more fluorine atoms. The ions and salts form from them are also known as complex fluorides. They can occur in salts, or in solution, but seldom as pure acids. Fluoroanions often contain elements in higher oxidation states. They mostly can be considered as fluorometallates, which are a subclass of halometallates.12 However some fluoroanions contain non-metals.

Anions that contain both fluorine and oxygen can be called "oxofluoroanions"3 (or rarely "fluorooxoanions").4

List of fluoroanions

The following is a list of fluoroanions in atomic number order.

  • trifluoroberyllate5
  • tetrafluoroberyllate6
  • tetrafluoroborate7
  • magnesium tetrafluoride
  • trifluoroaluminate AlOF2−3
  • tetrafluoroaluminate
  • pentafluoroaluminate
  • hexafluoroaluminate (fluoroaluminate)8
  • heptafluoroaluminate
  • hexafluorosilicate9
  • hexafluorophosphate10
  • Sulfur trifluoride anion
  • pentafluorosulfate(IV) aka pentafluorosulfite or Sulfur pentafluoride ion or sulfur pentafluoride anion [SF5]− gives off SF4 vapour.11
  • tetrafluorochlorate12
  • trifluoroscandate(II)?
  • tetrafluoroscandate?
  • hexafluoroscandate13
  • pentafluorotitanite [TiF5]2−14
  • hexafluorotitanite [TiF6]3−14
  • hexafluorotitanate [TiF6]2−14
  • tetrafluorovanadate(III)15
  • pentafluorovanadate(III)15
  • hexafluorovanadate(III)15
  • hexafluorovanadate(IV)16
  • hexafluorovanadate(V)16 unstable in water
  • hexafluorochromite [CrF6]3−17
  • hexafluorochromate [CrF6]2−17
  • trifluoromanganate MnF−3
  • hexafluoromanganate(III)
  • hexafluoromanganate(IV)
  • heptafluoromanganate IV
  • Tetrafluoroferrate 1− and 2−
  • hexafluoroferrate 4− and 3−
  • tetrafluorocobaltate II
  • Hexafluorocobaltate III and IV18
  • Heptafluorocobaltate IV18
  • Tetrafluoronickelate
  • Hexafluoronickelate II, III and IV
  • hexafluorocuprate
  • tetrafluorozincate
  • Hexafluorogallate19
  • hexafluorogermanate20
  • hexafluoroarsenate21
  • tetrafluorobromate
  • hexafluorobromate
  • tetrafluoroyttrate
  • pentafluorozirconate ZrF−5
  • hexafluorozirconate ZrF2−614
  • heptafluorozirconate ZrF3−714
  • octafluorozirconate ZrF4−8
  • hexafluoroniobate NbF−622
  • heptafluoroniobate NbF2−722
  • octafluoromolybdate MoF2−8
  • tetrafluoropalladate
  • hexafluororhodate
  • hexafluororuthenate(IV)
  • hexafluororuthenate(V)
  • trifluoroargentate(I)
  • hexafluoroindate23
  • hexafluorostannate24
  • fluoroantimonate21
  • hexafluoroiodate 1−
  • octafluoroxenate
  • tetrafluorolanthanate LaF−4
  • pentafluorocerate IV
  • Hexafluorocerate IV2526
  • Heptafluorocerate IV25
  • octafluorocerate IV25
  • pentafluorohafnate
  • hexafluorohafnate26
  • heptafluorotantalate TaF2−722
  • octafluorotantalate
  • heptafluorotungstate
  • octafluorotungstate WF2−8
  • octafluororhenate
  • hexafluoroplatinate
  • tetrafluoroaurate AuF−4
  • hexafluoroaurate AuF−6
  • trifluorothallate(I)
  • tetrafluorothallate(I)
  • tetrafluorothallate(III)27
  • hexafluorothallate(III)
  • tetrafluorobismuthate BiF−4
  • hexafluorobismuthate
  • hexafluorothorate
  • heptafluoroprotactinate(V)22
  • octafluoroprotactinate(V)
  • hexafluorouranate(IV)26
  • hexafluorouranate(V)28
  • heptafluorouranate(VI)
  • octafluorouranate(IV)
  • octafluorouranate(V)
  • octafluorouranate(VI)
  • hexafluoroneptunate(IV)29
  • hexafluoroneptunate(V)
  • hexafluoroneptunate(VII)30
  • heptafluoroneptunate(V)
  • heptafluoroneptunate(VI)
  • octafluoroneptunate(V)
  • hexafluoroplutonate(IV)29
  • hexafluoroplutonate(V)
References

References

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  2. "fluorometallate anion - Ontology Browser - Rat Genome Database". rgd.mcw.edu.
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  4. Hilbers, Martin; Leimkühler, Manfred; Mattes, Rainer (1 April 1989). "Zwei-und dreikernige Fluorooxoanionen des Vanadins. Kristallstrukturen von Cs(NMe 4 )[V 2 O 2 F 8 (H 2 O)] und (Na,K)(NMe 4 ) 2 [V 3 O 3 F 1 2] / Di- and Trinuclear Fluorooxoanions of Vanadium. Crystal Structures of Cs(NMe 4 )[VO 2 F 8 (H 2 O)] and (Na,K)(NMe 4 ) 2 [V 3 O 3 F 12 ]". Zeitschrift für Naturforschung B. 44 (4): 383–388. doi:10.1515/znb-1989-0403.
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  11. Tunder, R.; Siegel, B. (September 1963). "The SF5 anion". Journal of Inorganic and Nuclear Chemistry. 25 (9): 1097–1098. doi:10.1016/0022-1902(63)80128-1.
  12. Christe, Karl O.; Guertin, Jacques P. (1966). "Structure of the Tetrafluorochlorate(III) Anion, CLF4". Inorganic Chemistry. 5 (3): 473–476. doi:10.1021/ic50037a031.
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  28. Nitrosylium Hexafluorouranate (NOUF6) and Its Derivatives
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