Abstract
Osmium dioxide trifluoride, OsO 2F 3, has been synthesized thermally by the reaction of OsO 4 and OsF 6, or of OsOf 4 and OsO 3F 2. The yellow-green material is apparently isomorphous with the monoclinic α-phase of OsO 3F 2, and although the detailed structure is not known, the Raman spectrum indicates a fluorine bridged polymeric system is likely. OsO 2F 3 has either a small temperature independent susceptibility or a very small moment μ eff < 0.25 μ B, the uncertainty being due to the possibility of small amounts of paramagnetic impurity (<2%) in even the best samples prepared. The free molecule is polar, and disproportionates readily at temperatures required to obtain its mass spectrum. Magnetic susceptibilities are reported for OsO 3F 2, OsOF 4, OsO 2, OsF 5, and OsF 6, as well as the new molecule OsO 2F 3.
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