Abstract
Stretching vibration wavenumbers have been estimated for (NH 4) 2[VO(O 2) 2F] and (NH 4) 3[VO(O 2) 2F 2] based on normal coordinate calculations employing a valence force field derived from bond length—force constant correlations. The results bear out the recently suggested re-assignment of the vanadium—ligand stretching vibrations. The effect of ligands on the asymmetry of the ▪ group is discussed using structural data for 19 vanadium (V) peroxo complexes. The asymmetry of the ▪ group is different in compounds with different coordination numbers. This difference is accompanied by characteristic shifts of the vanadium—peroxo oxygen stretching mode absorptions.
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