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Becke¡¯s three-parameter hybrid functional with the PW91 correlation functional (B3PW91) was used in all calculations. The Los Alamos effective core potential combined with a DZ basis (LANL2DZ) was chosen for the transition metals, as a compromise between accuracy and computational power available. For the remaining atoms, the 6-31G* basis was used, supplemented with a set of diffuse functions in the case of the [M(CN)4]2- anions.
   The assignment of the calculated wavenumbers was aided by the animation option of the Molden 3.626 and MOLDRAW 1.0.. programs that give a visual presentation of the shape of the vibrational modes.

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