Tellurium tetrafluoride

Tellurium tetrafluoride

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IUPACName = tellurium(IV) fluoride
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Section1 = Chembox Identifiers
CASNo = 15192-26-4
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = TeF4
MolarMass = 203.594
Appearance = white crystalline solid
Density =
MeltingPt = 130 °C
BoilingPt =
Solubility =
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FlashPt =
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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"Inorganic Chemistry",Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0123526515] . The widely reported Te2F10 has been shown to be F5TeOTeF5 There are other tellurium compounds that contain fluorine, but only the two mentioned contain solely tellurium and fluorine. Tellurium difluoride, TeF2, and ditellurium fluoride, Te2F are not known.

Preparation

Tellurium tetrafluoride can be prepared by the following reaction:
TeO2 + 2SF4 → TeF4 + 2SOF2
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

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

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

*R.B. King; "Inorganic Chemistry of Main Group Elements", VCH Publishers, New York, 1995.
*W.C. Cooper; "Tellurium", VanNostrand Reinhold Company, New York, 1971.


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