Vibrational Frequencies

Typical Vibrational Frequencies of Inorganic Species1

Last Update: July 26, 2005

Figure 1.2  Observed frequency ranges for polyatomic ions.  See reference 2 for a description of the vibrations associated with each frequency.  Raman active bands are shown as dashed lines.

BF4-PF6-HCO3-NO2-NH4+
112891312951328-13753125
110783010351261-12701401
10885571000
1077838
1063
1038

Table 1.  Approximate IR frequencies (in cm-1) of other common polyatomic ions not shown in Figure 1.3

Figure 2.2  Metal-ligand vibrations.  See reference 1 for a complete discussion of the motions associated with each vibration.  The ranges for species marked with an “*” include both bridged and non-bridged compounds.  Whether a particular vibration is IR or Raman active depends on the particular geometry about the metal center.2, 4, 5, 6

References

1.  Click here to download this file in PDF format (link not yet active).

2.  Nakamoto, K. Infrared Spectra of Inorganic Coordination Compounds, 2nd Ed.Wiley-Interscience: New York, 1970.

3.  Dolphin, D. and Wick, A. Tabulation of Infrared Spectral Data Wiley-Interscience: New York, 1977.

4.  Drago, R. S. Physical Methods in Chemistry W. B. Saunders: Philadelphia, 1977.

5.  Ebsworth, E. A. V.; Rankin, D. W. H. and Cradock, S. Structural Methods in Inorganic Chemistry, 2nd Ed. Blackwell Scientific Publications: Boston, 1991.

6.  Wilson, Jr., E. B.; Decius, J. C. and Cross, P. C. Molecular Vibrations: The Theory of Infrared and Raman Vibrational Spectra Dover: New York, 1955.