Teflic acid: Difference between revisions

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Revision as of 09:11, 15 April 2012

Teflic acid

Names

IUPAC name Pentafluoroorthotelluric acid

Other names Teflic acid

Identifiers

3D model (JSmol)

Interactive image

ChemSpider

10331773

ECHA InfoCard

100.161.534

CompTox Dashboard (EPA)

DTXSID60570416

InChI

InChI=1S/F5HOTe/c1-7(2,3,4,5)6/h6HKey: OAOSLENTGBMCNC-UHFFFAOYSA-N
InChI=1/F5HOTe/c1-7(2,3,4,5)6/h6HKey: OAOSLENTGBMCNC-UHFFFAOYAO

SMILES

F(F)(F)(F)(F)O

Properties

Chemical formula

HF₅OTe

Molar mass

239.6

Appearance

colorless solid

Melting point

39.1 °C

Boiling point

59.7 °C

Hazards

Occupational safety and health (OHS/OSH):

Main hazards

corrosive, toxic

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

Y verify (what is ?) Infobox references

Chemical compound

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 C_4v.

Preparation

Teflic acid can be prepared from barium tellurate and fluorosulfonic acid:

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

It is also the first hydrolysis product of tellurium hexafluoride:

TeF₆ + H₂O → HOTeF₅ + HF

Teflates

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

2 B(OTeF₅)₃ → 2 B(OTeF₅)₂F + (OTeF₄)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),

References

^ 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) (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.

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