Tellurium tetrafluoride
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| Names | |
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| IUPAC name
tellurium(IV) fluoride
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| Identifiers | |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| TeF4 | |
| Molar mass | 203.594 |
| Appearance | white crystalline solid |
| Melting point | 129 °C (264 °F; 402 K) |
| Related compounds | |
Other anions
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tellurium dioxide, tellurium tetrachloride, tellurium(IV) bromide, tellurium(IV) iodide |
Other cations
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sulfur tetrafluoride, selenium tetrafluoride |
Related compounds
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tellurium hexafluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tellurium tetrafluoride, TeF4, is a stable, white, hygroscopic crystalline solid and is one of two fluorides of tellurium. The other binary fluoride is tellurium hexafluoride.[1] The widely reported Te2F10 has been shown to be F5TeOTeF5 [1] There are other tellurium compounds that contain fluorine, but only the two mentioned contain solely tellurium and fluorine. Tellurium difluoride, TeF2, and ditellurium difluoride, Te2F2 are not known.[1]
Preparation
[edit]Tellurium tetrafluoride can be prepared by the following reaction:
It is also prepared by reacting nitryl fluoride with tellurium or from the elements at 0 °C or by reacting selenium tetrafluoride with tellurium dioxide at 80 °C.
Fluorine in nitrogen can react with TeCl2 or TeBr2 to form TeF4. PbF2 will also fluorinate tellurium to TeF4.
Reactivity
[edit]Tellurium tetrafluoride will react with water or silica and forms tellurium oxides. Copper, silver, gold or nickel will react with tellurium tetrafluoride at 185 °C. It does not react with platinum. It is soluble in SbF5 and will precipitate out the complex TeF4SbF5.
Properties
[edit]
Tellurium tetrafluoride melts at 130 °C and decomposes to tellurium hexafluoride at 194 °C. In the solid phase, it consists of infinite chains of TeF3F2/2 in an octahedral geometry. A lone pair of electrons occupies the sixth position.
References
[edit]- R.B. King; Inorganic Chemistry of Main Group Elements, VCH Publishers, New York, 1995.
- W.C. Cooper; Tellurium, VanNostrand Reinhold Company, New York, 1971.
- ^ a b c Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5