Abstract
Gaseous μ 4-oxohexa-μ-nitratotetraberyllium, Be 4O(NO 3) 6, has been studied by electron diffraction at a temperature of ≈160°C. The intensity data were analysed in terms of a model having T symmetry. The molecular force field was estimated with the aid of a recently developed procedure to provide a satisfactory fit to 29 experimental frequencies and 39 amplitudes within the framework of a 24-parameter force field model. In the final stage of the structural analysis the amplitudes were varied in groups formed on the basis of spectroscopic calculations. The principal geometrical parameters refined to the following values ( r g structure, bond lengths in Å, angles in degrees): BeO 1 (O 1 is the central μ 4-oxygen atom), 1.665(21); BeO, 1.620(8); NO, 1.185(5); NO, 1.298(4); η (the angle of rotation of the NO 3 group about the twofold axis), 25.2(1.8); ∠ONO, 117.0(0.9) (the uncertainties are presented by 2.5 times the standard deviation values, plus a scale error).
Published Version
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