Force Constants and Mean Amplitudes of Vibration of Some Octahedral Anions

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Abstract
The modified orbital valence force field (MOVFF) has been employed to compute the force constants for FeF6 3-, GaF6 3-, InCl6 3-, SbCl6 − and M6+O6 (M = Mo, W and Te). The general valence force constants and mean amplitudes of vibration have also been calculated for M6+O6 (M = Mo, W and Te) at temperatures: T = O°K, T = 298.16°K and T = 500°K. The results have been briefly discussed. The orbital valence force field (OVFF) suggested by Heath and Linnett1 has been applied by several workers(2-5) for octahedral XY6 type systems. In some cases large discrepancy occurs between observed and calculated frequencies when four OVFF constants have been used. Recently Ramaswamy and Muthusubramanian6 have successfully applied the modified orbital valence force field (MOWF) for some complex halides of transition metals O f xY6 type. The results are very encouraging, therefore, it was thought worthwhile to apply the modified orbital valence force field (MOVFF) to some octahedral anions: FeF3- 6, GaF3- 6, InCl3- 6, SbCl− 6, Mo 6+ O, W6+ and Te6+06. The vibrational spectra of these anions have recently been interpreted on the basis of Octahedral symmetry. Moreover, the general valence force constants ad mean amplitudes of vibration for molecular M6+06 (M = Mo,W and Te) group in ordered perovskites have also been calculated.