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Tellurium tetrafluoride, TeF4, is a stable, white, hygroscopic crystalline solid and is one of three fluorides of tellurium. The other two binary fluorides are tellurium hexafluoride and ditellurium decafluoride. There are other tellurium compounds that contain fluorine, but only the three mentioned contain solely tellurium and fluorine. Tellurium difluoride is not known.
Tellurium tetrafluoride can be prepared by the following reaction:
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.
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.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tellurium_tetrafluoride". A list of authors is available in Wikipedia.|