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Teflic acid

Teflic acid
IUPAC name Pentafluoroorthotelluric acid
Other names Teflic acid
Molecular formula HF5OTe
Molar mass 223.20
Appearance colourless solid
Melting point

39.1 °C

Boiling point

59.7 °C

Main hazards corrosive
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Teflic acid is the chemical compound with the formula HOTeF5. This strong acid is related to orthotelluric acid, Te(OH)6. Teflic acid has octahedral geometry and, Ignoring its bent Te-O-H bond, has point group symmetry C4v.



Teflic acid can be prepared from barium tellurate and fluorosulfonic acid:[1]

5HOSO2F + BaO2Te(OH)4 → HOTeF5 + 4 H2SO4 + BaSO4

It is also the first hydrolysis product of tellurium hexafluoride:

TeF6 + H2O → HOTeF5 + HF


The conjugate base of teflic acid is called the teflate anion, F5TeO- (not to be confused with friflate). Many teflates are known, examples being B(OTF5)3 and the acid anhydride O(TeF5)2. Pyrolysis of the boron compound gives the dimer (TeF4O)2[1]

2 B(OTF5)3 → 2 B(OTF5)2F + (OTF4)2

The teflate anion is known to resist oxidaton. This property has allowed the preparation several highly unusual species such as the hexateflates M(OTeF5)6- (M = As, Sb, Bi). Xenon forms the cation Xe(OTeF5)+,[2]


  1. ^ a b Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  2. ^ Mercier, H. P.A.; Sanders, J. C. P.; Schrobilgen, G. J. "The Hexakis(pentafluorooxotellurato)pnictate(V) Anions, M(OTeF5)6- (M = As, Sb, Bi): A Series of Very Weakly Coordinating Anions" Journal of the American Chemical Society, volume 116, 2921, (1994). doi:10.1021/ja00086a025.

Further reading

  • R.B. King; Inorganic Chemistry of Main Group Elements, VCH Publishers, New York,1994.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Teflic_acid". A list of authors is available in Wikipedia.
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