Iridium (VI) fluoride
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Iridium (VI) fluoride | |||||||||||||||
other names |
Iridium hexafluoride |
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Molecular formula | IrF 6 | |||||||||||||||
Brief description |
yellow crystalline solid |
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properties | ||||||||||||||||
Molar mass | 306.22 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
5.11 g cm −3 (−140 ° C) |
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Melting point |
44 ° C |
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boiling point |
53.6 ° 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 . |
Iridium (VI) fluoride (IrF 6 ), often also iridium hexafluoride , is a chemical compound of the elements iridium and fluorine and belongs to the group of hexafluorides .
presentation
Iridium hexafluoride is produced by direct conversion of the metal in an excess of elemental fluorine (F 2 ) at 300 ° C.
properties
Iridium hexafluoride is a yellow crystalline solid that melts at 44 ° C and boils at 53.6 ° C. It is in the form of pale yellow, shiny leaves and needles, which become intensely golden yellow and glassy above −15 ° C. It is very hygroscopic, attacks glass. Platinum is corroded from 400 ° C. Halogens reduce it to iridium (IV) fluoride at room temperature . It crystallizes in the orthorhombic crystal system (measured at −140 ° C) in the space group Pnma (No. 62) with the lattice parameters a = 941.1 pm , b = 854.7 pm and c = 495.2 pm and four formula units per unit cell with a calculated density of 5.11 g cm −3 . The IrF 6 molecule is octahedral ( O h ); the Ir-F bond length is 183.3 pm.
Individual evidence
- ↑ a b c d David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-68.
- ↑ a b c d T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", in: Inorganic Chemistry , 2006 , 45 (9), pp. 3782-3788; doi : 10.1021 / ic052029f ; PMID 16634614 .
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 282.
literature
- Gmelins Handbuch der Inorganic Chemistry , System No. 67, Iridium, Supplementary Volume 2, pp. 99-102.