Osmium hexafluoride

Osmium hexafluoride
Osmium(VI)-fluoride.svg
Unit cell of osmium hexafluoride under standard conditions.
Unit cell of osmium hexafluoride.
Names
IUPAC name
osmium(VI) fluoride
Other names
osmium hexafluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.969 Edit this at Wikidata
UNII
  • InChI=1S/6FH.Os/h6*1H;/q;;;;;;+6/p-6
    Key: MLKFZZUUYQWFMO-UHFFFAOYSA-H
  • InChI=1/6FH.Os/h6*1H;/q;;;;;;+6/p-6/rF6Os/c1-7(2,3,4,5)6
    Key: MLKFZZUUYQWFMO-ZXTFGAQLAX
  • F[Os](F)(F)(F)(F)F
Properties
OsF6
Molar mass 304.22 g/mol
Appearance yellow crystalline solid
Density 5.09g/mL
Melting point 33.4 °C (92.1 °F; 306.5 K)
Boiling point 47.5 °C (117.5 °F; 320.6 K)
Structure
Pnma, No. 62
a = 938.7 pm, b = 854.3 pm, c = 494.4 pm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Osmium hexafluoride, also osmium(VI) fluoride, (OsF6) is a compound of osmium and fluorine, and one of the seventeen known binary hexafluorides.

Synthesis

Osmium hexafluoride is made by a direct reaction of osmium metal exposed to an excess of elemental fluorine gas at 300 °C.

Os + 3 F
2
OsF
6

Description

Osmium hexafluoride is a yellow crystalline solid that melts at 33.4 °C and boils at 47.5 °C. The solid structure measured at −140 °C is orthorhombic space group Pnma. Lattice parameters are a = 9.387 Å, b = 8.543 Å, and c = 4.944 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 5.09 g·cm−3.

The OsF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Os–F bond length is 1.827 Å.

Partial hydrolysis of OsF6 produces OsOF4.


This page was last updated at 2023-07-04 05:56 UTC. Update now. View original page.

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