Electron-Diffraction Investigation of the Hexafluorides of Tungsten, Osmium, Iridium, Uranium, Neptunium, and Plutonium
Abstract
An electron-diffraction investigation has been made by the sector-microphotometer method on WF6, OsF6, IrF6, UF6, NpF6, and PuF6. The photographs of all these compounds reflect a phase shift which if not accounted for leads to asymmetric structures for the molecules. It sets in at smaller values of s = 4πλ-1sin(θ / 2) the heavier the molecule and the greater the electron wavelength. There is good evidence for the symmetrical octahedral structure of all the compounds. The metal-fluorine distances were found to be 1.833 Å (W-F), 1.831 Å (Os-F), 1.830 Å(Ir-F), 1.996 Å (U-F), 1.981 Å (Np-F), and 1.971 Å (Pu-F), with estimated limits of error of ±0.008 Å except for ±0.010 Å for Pu-F.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- May 1968
- DOI:
- 10.1063/1.1669727
- Bibcode:
- 1968JChPh..48.4001K