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. 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.
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
to form TeF4
will also fluorinate tellurium to TeF4
Tellurium tetrafluoride will react with water
and forms tellurium oxides. Copper
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 TeF4
Tellurium tetrafluoride melts at 130 °C and decomposes to tellurium hexafluoride
at 194 °C. In the solid phase it consists of infinite chains of TeF3
in an octahedral geometry. A lone pair of electrons occupies the sixth position.
- R.B. King; Inorganic Chemistry of Main Group Elements, VCH Publishers, New York, 1995.
- W.C. Cooper; Tellurium, VanNostrand Reinhold Company, New York, 1971.