Teflic acid
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| Teflic acid | |
|---|---|
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| IUPAC name | Pentafluoroorthotelluric acid |
| Other names | Teflic acid |
| Properties | |
| Molecular formula | HF5OTe |
| Molar mass | 223.20 |
| Appearance | colourless solid |
| Melting point |
39.1 °C |
| Boiling point |
59.7 °C |
| Hazards | |
| 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 |
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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.
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[edit] Preparation
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
[edit] Teflates
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]
[edit] References
- ^ a b Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ 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.
[edit] Further reading
- R.B. King; Inorganic Chemistry of Main Group Elements, VCH Publishers, New York,1994.
