Osmium (VI) fluoride
Crystal structure | ||||||||||||||||
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__ Os 6+ __ F - | ||||||||||||||||
Crystal system |
orthorhombic |
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Space group |
Pnma (No. 62) |
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Lattice parameters |
a = 938.7 pm , b = 854.3 pm, c = 494.4 pm |
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General | ||||||||||||||||
Surname | Osmium (VI) fluoride | |||||||||||||||
other names |
Osmium hexafluoride |
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Ratio formula | OsF 6 | |||||||||||||||
Brief description |
yellow crystalline solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 304.22 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
5.09 g cm −3 (−140 ° C) |
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Melting point |
33.4 ° C |
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boiling point |
47.5 ° 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 . |
Osmium (VI) fluoride (OsF 6 ), often also osmium hexafluoride , is a chemical compound of the elements osmium and fluorine and belongs to the group of hexafluorides .
presentation
Osmium hexafluoride is produced by direct conversion of the metal in an excess of elemental fluorine (F 2 ) at 300 ° C.
properties
Osmium hexafluoride is a yellow crystalline solid that melts at 33.4 ° C and boils at 47.5 ° C. It crystallizes in the orthorhombic crystal system (measured at −140 ° C) in the space group Pnma (space group no. 62) with the lattice parameters a = 938.7 pm , b = 854.3 pm and c = 494.4 pm and four formula units per unit cell with a calculated density of 5.09 g · cm −3 . The OsF 6 molecule is octahedral ( O h ); the Os – F bond length is 182.7 pm.
use
By reaction with tungsten hexacarbonyl may osmium (IV) fluoride are recovered.
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. 4-79.
- ↑ 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.
- ↑ G. Singh: Chemistry Of Lanthanides And Actinides . Discovery Publishing House, 2007, ISBN 81-8356-241-8 , pp. 307 ( limited preview in Google Book search).
literature
- Gmelin's Handbook of Inorganic Chemistry , System No. 53, Osmium, Supplement Volume 1, pp. 111-114.