Abstract
The polarized infrared spectra of single crystals of Na 2Ni(CN) 4·3H 2O and BaNi(CN) 4·4H 2O are reported. Factor group analyses on the two crystal systems yielded two sets of selection rules which both aided in the assignments of the frequencies for the tetracyanonickelate (II) ion and accounted for the diversity in the band structure found in the two sets of spectra. Interfering water vibrational frequencies were adequately distinguished by comparison with the spectra of the analogous compound, Na 2Ni(CN) 4·3D 2O. Employing a simplified quadratic valence force field, approximate valence force constants were calculated for the tetracyanonickelate(II) ion.
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