Teflic acid

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Teflic acid
Structural formula
Space-filling model
IUPAC name
Pentafluoroorthotelluric acid
Other names
Teflic acid
3D model (JSmol)
ECHA InfoCard 100.161.534
Molar mass 239.6
Appearance colorless solid
Melting point 39.1 °C (102.4 °F; 312.2 K)
Boiling point 59.7 °C (139.5 °F; 332.8 K)
Main hazards corrosive, toxic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox 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 triflate). Many teflates are known, examples being B(OTeF5)3 and the acid anhydride O(TeF5)2. Pyrolysis of the boron compound gives the dimer (TeF4O)2[1]

2 B(OTeF5)3 → 2 B(OTeF5)2F + (OTeF4)2

The teflate anion is known to resist oxidation. 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[edit]

  • R.B. King; Inorganic Chemistry of Main Group Elements, VCH Publishers, New York,1994.