Chromium (V) fluoride
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| Green: fluoride ions | ||||||||||
| General | ||||||||||
| Surname | Chromium (V) fluoride | |||||||||
| other names |
Chromium pentafluoride |
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| Ratio formula | CrF 5 | |||||||||
| Brief description |
crimson, crystalline, volatile solid |
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| properties | ||||||||||
| Molar mass | 146.988 g mol −1 | |||||||||
| Physical state |
firmly |
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| Melting point |
34 ° C |
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| boiling point |
117 ° C |
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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 . | ||||||||||
Chromium (V) fluoride is a chemical compound of the elements chromium and fluorine . It is a crimson, crystalline solid that melts at 34 ° C and is very volatile. This substance is also very oxidizing.
Extraction and presentation
Chromium (V) fluoride can be obtained directly from the elements at 400 ° C and a pressure of 200 bar:
properties
Physical Properties
Chromium (V) fluoride is polymeric in the solid phase in the form of cis-linked CrF 6 octahedra; in the gas phase it is monomeric in the form of trigonal-bipyramidal molecules. The crystal structure is orthorhombic , space group Pbcm (space group no. 57) , with the lattice parameters a = 7.829 Å , b = 7.534 Å and c = 5.518 Å.
Chemical properties
Chromium (V) fluoride is a strong oxidizing agent and forms CrF 6 - complexes that are octahedral.
Individual evidence
- ↑ a b c d webelements.com: Chromium (V) -fluorid , accessed on January 18, 2012.
- ↑ 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 c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1571.
- ↑ H. Shorafa, K. Seppelt: The Structures of CrF 5 and CrF 5 · SbF 5 . In; Journal for inorganic and general chemistry , 635, 2009, pp. 112-114, doi: 10.1002 / zaac.200800378 .