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Published May 1, 1968 | Published
Journal Article Open

Electron-Diffraction Investigation of the Hexafluorides of Tungsten, Osmium, Iridium, Uranium, Neptunium, and Plutonium


An electron‐diffraction investigation has been made by the sector–microphotometer method on WF_6, OsF_6, IrF_6, UF_6, NpF_6, and PuF_6. 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^(−1) sin (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.

Additional Information

© 1968 American Institute of Physics. (Received 9 August 1967) This work was supported in part by the U.S. Office of Naval Research and was performed in part under the auspices of the U.S. Atomic Energy Commission. This paper is based in part on D. W. Smith's Ph.D. thesis, California Institute of Technology, 1958.

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