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{{chembox |
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{{chembox |
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| verifiedrevid = 414397362 |
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| ImageFile = Tellurium-tetrafluoride-xtal-1984-3D-balls.png |
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| ImageFile = Tellurium-tetrafluoride-xtal-1984-3D-balls.png |
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| ImageSize = 200px |
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| ImageSize = |
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| IUPACName = tellurium(IV) fluoride |
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| IUPACName = tellurium(IV) fluoride |
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| OtherNames = |
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| OtherNames = |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 15192-26-4 |
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| PubChem = 167258 |
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| CASNo = 15192-26-4 |
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| SMILES = |
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| PubChem = 167258 |
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| SMILES = |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = TeF<sub>4</sub> |
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| Formula = TeF<sub>4</sub> |
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| MolarMass = 203.594 |
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| MolarMass = 203.594 |
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| Appearance = white crystalline solid |
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| Appearance = white crystalline solid |
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| Density = |
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| Density = |
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| MeltingPt = 129 °C |
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| MeltingPtC = 129 |
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| Solubility = |
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| Section3 = {{Chembox Hazards |
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|Section3={{Chembox Hazards |
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| FlashPt = |
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| Autoignition = |
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| Section4 = {{Chembox Related |
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|Section4={{Chembox Related |
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| OtherAnions = ], ], ], ] |
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| OtherAnions = ], ], ], ] |
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| OtherCations = ], ] |
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| OtherCations = ], ] |
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| RelatedCpds = ] |
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| OtherCompounds = ] |
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'''Tellurium tetrafluoride''', TeF<sub>4</sub>, is a stable, white, hygroscopic crystalline solid and is one of two fluorides of ]. The other binary fluoride is ]<ref name = "Wiberg">''Inorganic Chemistry'',Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5</ref>. The widely reported ] has been shown to be F<sub>5</sub>TeOTeF<sub>5</sub> <ref name = "Wiberg"/> There are other tellurium compounds that contain fluorine, but only the two mentioned contain solely tellurium and fluorine. Tellurium difluoride, TeF<sub>2</sub>, and ditellurium fluoride, Te<sub>2</sub>F are not known.<ref name = "Wiberg"/> |
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'''Tellurium tetrafluoride''', TeF<sub>4</sub>, is a stable, white, hygroscopic crystalline solid and is one of two fluorides of ]. The other binary fluoride is ].<ref name = "Wiberg">''Inorganic Chemistry'',Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 {{ISBN|0-12-352651-5}}</ref> The widely reported ] has been shown to be F<sub>5</sub>TeOTeF<sub>5</sub> <ref name = "Wiberg"/> There are other tellurium compounds that contain fluorine, but only the two mentioned contain solely tellurium and fluorine. Tellurium difluoride, TeF<sub>2</sub>, and ditellurium difluoride, Te<sub>2</sub>F<sub>2</sub> are not known.<ref name = "Wiberg"/> |
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==Preparation== |
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==Preparation== |
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Tellurium tetrafluoride can be prepared by the following reaction: |
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Tellurium tetrafluoride can be prepared by the following reaction: |
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] + 2] → TeF<sub>4</sub> + 2] |
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:] + 2] → TeF<sub>4</sub> + 2] |
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It is also prepared by reacting ] with tellurium or from the elements at 0 °C or by reacting ] with ] at 80 °C.<br> |
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It is also prepared by reacting ] with tellurium or from the elements at 0 °C or by reacting ] with ] at 80 °C.<br> |
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Fluorine in nitrogen can react with ] or ] to form TeF<sub>4</sub>. ] will also fluorinate tellurium to TeF<sub>4</sub>. |
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Fluorine in nitrogen can react with ] or ] to form TeF<sub>4</sub>. ] will also fluorinate tellurium to TeF<sub>4</sub>. |
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==Reactivity== |
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==Reactivity== |
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Tellurium tetrafluoride will react with ] or ] and forms tellurium oxides. ], ], ] or ] will react with tellurium tetrafluoride at 185 °C. It does not react with ]. It is soluble in ] and will precipitate out the complex TeF<sub>4</sub>SbF<sub>5</sub>. |
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Tellurium tetrafluoride will react with ] or ] and forms tellurium oxides. ], ], ] or ] will react with tellurium tetrafluoride at 185 °C. It does not react with ]. It is soluble in ] and will precipitate out the complex TeF<sub>4</sub>SbF<sub>5</sub>. |
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==Properties== |
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==Properties== |
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Tellurium tetrafluoride melts at 130 °C and decomposes to ] at 194 °C. In the solid phase it consists of infinite chains of TeF<sub>3</sub>F<sub>2/2</sub> in an octahedral geometry. A lone pair of electrons occupies the sixth position. |
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Tellurium tetrafluoride melts at 130 °C and decomposes to ] at 194 °C. In the solid phase, it consists of infinite chains of TeF<sub>3</sub>F<sub>2/2</sub> in an octahedral geometry. A lone pair of electrons occupies the sixth position. |
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==References== |
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==References== |
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{{Tellurium compounds}} |
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{{Tellurium compounds}} |
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{{fluorine compounds}} |
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