Tellurium tetrafluoride
| Crystal structure | ||||||||||
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| __ Te 4+ __ F - | ||||||||||
| General | ||||||||||
| Surname | Tellurium tetrafluoride | |||||||||
| other names |
Tellurium (IV) fluoride |
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| Ratio formula | TeF 4 | |||||||||
| Brief description |
colorless solid |
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| External identifiers / databases | ||||||||||
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| properties | ||||||||||
| Molar mass | 203.59 g mol −1 | |||||||||
| Physical state |
firmly |
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| density |
4.22 g cm −3 |
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| Melting point |
129 ° C |
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| boiling point |
374 ° C |
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| solubility |
reacts with water |
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| safety instructions | ||||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Tellurium tetrafluoride is a chemical compound of tellurium from the group of fluorides .
Extraction and presentation
Tellurium tetrafluoride can be obtained by reacting tellurium dioxide with sulfur tetrafluoride under pressure. The representation from the elements or by thermal decomposition of sodium or potassium fluorocomplexes NaTeF 5 or KTeF 5 at 450 to 600 ° C is also possible.
properties
Tellurium tetrafluoride is a colorless solid that decomposes on contact with water. From a temperature of 195 ° C it slowly decomposes to tellurium hexafluoride .
In liquid form, the compound conducts electricity. The vapor of the compound is red in color. In solid form it has a polymer structure TeF 3 -F -... which is connected via the fluorine atoms . It attacks glass, copper , nickel , gold and mercury at temperatures around their decomposition point. Tellurium tetrafluoride has an orthorhombic crystal structure with the space group P 2 1 2 1 2 1 (space group no. 19) and the lattice parameters a = 536 pm, b = 622 pm and c = 964 pm.
use
Tellurium tetrafluoride can be used as a fluorinating agent and a fluoridating agent.
Individual evidence
- ↑ a b c d William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, p. 94 ( limited preview in Google Book search).
- ^ D'Ans-Lax: Pocket book for chemists and physicists , Volume 3, p. 758; ISBN 3-540-60035-3
- ↑ a b c d e A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 632.
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ a b Jane E. Macintyre: Dictionary of Inorganic Compounds . CRC Press, 1992, pp. 3195 ( limited preview in Google Book search).
- ↑ AJ Edwards, FI Hewaidy: Fluoride crystal structures. Part IV. Tellurium tetrafluoride. In: Journal of the Chemical Society A: Inorganic, Physical, Theoretical. 1968, p. 2977, doi : 10.1039 / J19680002977 .