An X-ray crystal structure determination has shown that the anion in K5[Nb(CN)8] has dodecahedral (D2d) symmetry with significantly different Nb–C distances of 2·282(4) and 2·242(4)Å for the A and B sites; vibrational spectra indicate that in aqueous solution the structure of the anion changes to the antiprismatic (D4d) form.
M. B. Hursthouse, A. M. Galas, A. M. Soares and W. P. Griffith, J. Chem. Soc., Chem. Commun., 1980, 1167 DOI: 10.1039/C39800001167
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