Far Infrared and Raman Spectra of K3[Co(CN)6] and [Co(NH3)6][Co(CN)6]

Far infrared spectra of K3[Co(CN)6] and [Co(NH3)6][Co(CN)6] and a single crystal Raman spectrum of K3[Co(CN)6] have been measured. Calculations of optically active crystal vibration frequencies have been made, on the basis of the crystal structure determined precisely. For these two types of established crystal structures (C2h5 for K3[Co(CN)6] and C3i2 for [Co(NH3)6]) [Co(CN)6] of hexacyano-complex salts, lattice frequencies have been determined. For [Co(NH3)6][Co(CN)6] the mean amplitudes of two kinds of cobalt atoms have been calculated and compared with those obtained by Iwata and Saito assuming that both complex ions behave as a rigid body.